Publications | Photonic and RF Engineering Group | Faculty of Engineering


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		Photonic and Radio Frequency Engineering Group

Publication List

Details of all publications by members of the Photonic and RF Engineering Group are given on this page. Click on a year to see publications from that year.

Total number of publications currently in the database = 546.

2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000

1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986

Publications for 2013

S.N. Kaunga-Nyirenda, S. Bull, J.J. Lim, K.-H. Hasler, J. Fricke and E.C. Larkins, "Factors influencing the brightness and beam quality of tapered laser diodes," Semiconductor and Integrated OptoElectronics (SIOE) Conference, Cardiff, UK (2013).

H. Dias, S.N. Kaunga-Nyirenda, J.J. Lim, A.J. Phillips and E.C. Larkins, "Modelling the dynamics of a PhC cavity switch," Semiconductor and Integrated OptoElectronics (SIOE) Conference, Cardiff, UK (2013).

Publications for 2012

E.C. Larkins, "Photonics - A key enabling technology on its way to Horizon 2020," Academy of Finland National Conference of the Photonics & Modern Imaging Techniques Research Programme "Look to the Future", Helsinki, Finland (2012) INVITED.

E.C. Larkins, "Photonics by design: Optoelectronic simulation tools come of age," Academy of Finland National Conference of the Photonics & Modern Imaging Techniques Research Programme "Look to the Future", Helsinki, Finland (2012) KEYNOTE TALK.

J.J. Lim, S. Bull, S.N. Kaunga-Nyirenda, S. Sujecki, K.-H. Hasler, J. Fricke and E.C. Larkins, "Factors influencing the brightness and beam quality of tapered laser diodes and bars," Proceedings of the IEEE Summer Topical Meeting: High Power Semiconductor Lasers, Seattle, WA, USA (2012) INVITED.

S. Bull, J.J. Lim, C.K. Amuzuvi, J.W. Tomm, J. Nagle, B. Sumpf, G. Erbert, N. Michel, M. Krakowski and E.C. Larkins, "Emulation of the operation and degradation of high-power laser bars using simulation tools," Semiconductor Science and Technology, Vol. 27, 094012 (2012) INVITED.

S. Bull, E.C. Larkins, T. Brand, A. Unger, M. Traub, S. Hengesbach, P. Uusimaa, V. Vilokkinen, P. Crump, G. Erbert, G. Lucas-Leclin, P. Georges, T. Rataj and E. Deichsel, "The BRIDLE Project: High brilliance diode lasers for industrial applications," The Celebration of the 50th Anniversary of the Diode Laser, Coventry, UK (2012).

S.N. Kaunga-Nyirenda, S. Bull, J.J. Lim and E.C. Larkins, "Design and simulation of next generation high-brightness laser diodes and bars," The Celebration of the 50th Anniversary of the Diode Laser, Coventry, UK (2012).

A.O. Aladeloba, A.J. Phillips and M.S. Woolfson, "Performance evaluation of optically preamplified digital pulse position modulation turbulent free-space optical communication systems," IET Optoelectronics, Vol. 6, 66 (2012).

A.O. Aladeloba, A.J. Phillips and M.S. Woolfson, "Improved bit error rate evaluation for optically pre-amplified free-space optical communication systems in turbulent atmosphere," IET Optoelectronics, Vol. 6, 26 (2012).

P.N. Desai, A.J. Phillips and S. Sujecki, "Modelling of burst mode 2R optical regenerator cascades for long-haul optical networks," Journal of Optical Communications and Networking, Vol. 4, 304 (2012).

H.K. Dias, S.N. Kaunga-Nyirenda, J.J. Lim, A.J. Phillips and E.C. Larkins, "Modelling carrier transport of a photonic crystal cavity all-optical switch," Photonics in Switching Conference, Ajaccio, Corsica (2012).

A.O. Aladeloba, A.J. Phillips and M.S. Woolfson, "DPPM FSO communication systems impaired by turbulence, pointing error and ASE noise," 14th International Conference on Transparent Optical Networks (ICTON), Coventry, UK (2012).

P.N. Desai, A.J. Phillips and S. Sujecki, "Performance evaluation for 2R burst mode optical regenerator cascades in presence of co-channel phase uncorrelated crosstalk," 14th International Conference on Transparent Optical Networks (ICTON), Coventry, UK (2012).

M.A. Othman and I. Harrison, "220 GHz detection using 0.35µm AMS MOSFET as sub-THz detector: Drain bias detraction," 3rd International Conference on Intelligent Systems, Modelling and Simulation (ISMS), Kota Kinabalu, Malaysia (2012).

Publications for 2011

C.K. Amuzuvi, S. Bull, J.W. Tomm, J. Nagle, B. Sumpf, G. Erbert, N. Michel, M. Krakowski and E.C. Larkins, "The impact of temperature and strain-induced band gap variations on current competition and emitter power in laser bars," Applied Physics Letters, Vol. 98, 241108 (2011).

D. Paboeuf, D. Vijayakumar, O.B. Jensen, B. Thestrup, J.J. Lim, S. Sujecki, E.C. Larkins, G. Lucas-Leclin and P. Georges, "Volume Bragg grating external cavities for the passive phase-locking of high-brightness diode laser arrays: A theoretical and experimental study," Journal of the Optical Society of America B, Vol. 28, 1289 (2011).

S. Bull, J.J. Lim, M. Krakowski and E.C. Larkins, "Simulation of intracavity laser diode spontaneous emission spectra and comparison with experiment," 4th High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK (2011).

S. Bull, C.K. Amuzuvi, J.W. Tomm, B. Sumpf, G. Erbert and E.C. Larkins, "The impact of temperature on current competition, emitter power distribution and degradation in high power red laser bars," 4th High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK (2011).

S.N. Kaunga-Nyirenda, J.J. Lim, S. Bull and E.C. Larkins, "Elimination of numerical underflow in the modelling of optoelectronic devices using multiple precision," Proceedings of the 11th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Rome, Italy (2011).

S. Malaguti, A. Armaroli, G. Bellanca, S.Trillo, S.N. Kaunga-Nyirenda, J.J. Lim, E.C. Larkins, P. Trost-Kristensen, K. Yvind, J. Mork, Y. Dumeige, M. Gay, P. Colman, S. Combrié and A. de Rossi, "Numerical modelling in photonic crystals integrated technology: The COPERNICUS Project," Proceedings of the 11th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Rome, Italy (2011).

O. Ayodele, P.L. Arnold, M. Ali, A.J. Phillips, I.V. Sazanovich, J.A. Weinstein and S. Sujecki, "Numerical and experimental investigation of up conversion in Er-doped sol-gel Si0₂," Proceedings of the 11th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Rome, Italy (2011).

H.K. Dias, J.J. Lim, A.J. Phillips and E.C. Larkins, "Semiconductor free surface effects on carrier transport for a photonic crystal membrane all-optical gate," Semiconductor and Integrated OptoElectronics (SIOE) Conference, Cardiff, UK (2011).

L.M. Ridgway and I. Harrison, "High frequency dielectric properties of bismuth substituted barium hexaferrite," Electrical Power Systems and Computers, Lecture Notes in Electrical Engineering, Vol. 99, 995 (2011).

L.M. Ridgway and I. Harrison, "Dielectric resonator antenna using high permittivity bismuth substituted barium hexaferrite," Electrical Power Systems and Computers, Lecture Notes in Electrical Engineering, Vol. 99, 1001 (2011).

L. Xiao, K.-L. Choy and I. Harrison, "Co-doped BST thin films for tunable microwave applications," Surface and Coatings Technology, Vol. 205, 2989 (2011).

Publications for 2010

W. Lu, R.P. Campion, C.T. Foxon and E.C. Larkins, "A theoretical model for the MBE growth of AlGaAsN using ammonia as the N source," Journal of Crystal Growth, Vol. 312, 1029 (2010).

S. Kaunga-Nyirenda, M.P. Dlubek, A.J. Phillips, S. Sujecki, J.J. Lim and E.C. Larkins, "Theoretical investigation of the role of optically induced carrier pulsations in wave mixing in SOAs," Journal of the Optical Society of America B, Vol. 27, 168 (2010).

M.P. Dlubek, S.N. Kaunga-Nyirenda, A.J. Phillips, S. Sujecki, I. Harrison and E.C. Larkins, "Experimental verification of the existence of optically induced carrier pulsations in SOAs," Optics Communications, Vol. 283, 1481 (2010).

R. Ma, T.J. Zuo, S. Sujecki and A.J. Phillips , "Improved performance evaluation for DC-coupled burst mode reception in the presence of amplified spontaneous emission noise and interchannel crosstalk," IET Optoelectronics, Vol. 4, 121 (2010).

T.J. Zuo and A.J. Phillips, "Performance analysis of DC coupled peak detecting burst mode receiver in the presence of ASE noise and interchannel crosstalk," Journal of Lightwave Technology, Vol. 28, 1079 (2010).

S. Isaak, S. Bull, M.C. Pitter and I. Harrison, "Fully integrated linear single photon avalanche diode (SPAD) array with parallel readout circuit in a standard 180 nm CMOS process," International Conference on Enabling Science and Nanotechnology (ESciNano 2010), Kuala Lumpur, Malaysia (2010).

S. Isaak, M.C. Pitter, S. Bull and I. Harrison, "Design and characterisation of 16×1 parallel outputs SPAD array in 0.18µm CMOS technology," IEEE Asia Pacific Conference on Circuits and Systems (APCCAS 2010), Kuala Lumpur, Malaysia (2010).

M.A. Othman and I. Harrison, "Continuous wave (CW) sub-terahertz (sub-THz) detection by plasma wave in high electron mobility transistor (HEMT)," IEEE Asia Pacific Conference on Circuits and Systems (APCCAS 2010), Kuala Lumpur, Malaysia (2010).

Publications for 2009

J.J. Lim, S. Sujecki, L. Lang, Z. Zhang, D. Paboeuf, G. Pauliat, G. Lucas-Leclin, P. Georges, R.C.I. MacKenzie, P. Bream, S. Bull, K.-H. Hasler, B. Sumpf, H. Wenzel, G. Erbert, B. Thestrup, P.M. Petersen, N. Michel, M. Krakowski and E.C. Larkins, "Design and simulation of next-generation high-power, high-brightness laser diodes," IEEE Journal of Selected Topics in Quantum Electronics, Vol. 15, 993 (2009) INVITED.

W. Lu, J.J. Lim, S. Bull, A.V. Andrianov, C. Staddon, C.T. Foxon, M. Sadeghi, S.M. Wang, A. Larsson and E.C. Larkins, "Independent determination of In and N concentrations in GaInNAs alloys," Semiconductor Science and Technology, Vol. 24, 105016 (2009).

W. Lu, S. Bull, J.J. Lim, R. Mackenzie, S. Sujecki, A.V. Andrianov, M. Sadeghi, S.M. Wang, A. Larsson, P. Melanen, P. Sipila, P. Uusimaa, C.T. Foxon and E.C. Larkins, "Reliability assessment and degradation analysis of 1.3µm GaInNAs lasers," Journal of Applied Physics, Vol. 106, 093110 (2009).

Z. Zhang, J.J. Lim, N. Dubreuil, E.C. Larkins, A.J. Kent, G. Pauliat and S. Sujecki, "Numerical modeling of photorefractive crystals for self-adapting external cavity laser mirrors," Optical and Quantum Electronics, Vol. 41, 681 (2009).

M. Dumitrescu, M. Wolf, K. Schulz, Y.Q. Wei, G. Adolfsson, J. Gustavsson, J. Bengtsson, M. Sadegh, S.M. Wang, A. Larsson, E.C. Larkins, P. Melanen, P. Uusimaa and M. Pessa, "10 Gb/s uncooled dilute-nitride optical transmitters operating at 1.3 µm," Proceedings of the 2009 Conference on Optical Fiber Communication (OFC), pp. 1–3 (2009).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Evolution of the probability density functions of Gaussian ASE noise in zero-memory nonlinear fibre," Optical Fiber Technology, Vol. 15, 187 (2009).

T.J. Zuo, R. Ma, A.J. Phillips and S. Sujecki, "Performance analysis of optically preamplified DC-coupled burst mode receivers," European Transactions on Telecommunications, Vol. 20, 281 (2009).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Method for OSNR monitoring based on modulation spectrum assessment," IET Optoelectronics, Vol. 3, 86 (2009).

T.J. Zuo and A.J. Phillips, "Performance of burst mode receivers for optical digital pulse position modulation in passive optical network application," IET Optoelectronics, Vol. 3, 123 (2009).

Z. Zhang, J.J. Lim, P.J. Bream, E.C. Larkins, A.J. Kent, N. Dubreuil, G. Pauliat and S. Sujecki,, "Self-organizing external cavity laser diodes," 2nd High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK, (2009).

J.J. Lim, E.C. Larkins, P.J. Bream, N. Michel, M. Krakowski and S. Sujecki,, "Spectroscopic simulation of tapered laser diodes," 2nd High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK, (2009).

L. Lang, J.J. Lim, S. Bull, B. Thestrup, S. Sujecki, N. Michel, P.M. Petersen, M. Krakowski and E.C. Larkins, "Asymmetric feedback external cavity laser diodes: Comparison of experiment and simulation," 2nd High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK, (2009).

C.K. Amuzuvi, S. Bull, J.J. Lim, S. Sujecki and E.C. Larkins, "Numerical emulation of the degradation of 975nm high power tapered laser bars," 2nd High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK (2009) INVITED.

G. Lucas-Leclin, D. Paboeuf, P. Georges, N. Michel, M. Krakowski, J.J. Lim, S. Sujecki and E.C. Larkins, "External-cavity designs for phase coupled laser diode arrays," 2nd High Power Diode Lasers and Systems Meeting (HPDLS), Coventry, UK (2009) INVITED.

J.J. Lim, S. Sujecki, P.J. Bream, N. Michel and E.C. Larkins, "Acceleration of a quasi-3D spectral laser diode simulator," Numerical Simulation of Optoelectronic Devices (NUSOD '09). 14th - 18th September, Gwangju, South Korea (2009).

Z. Zhang, J.J. Lim, N. Dubreuil, E.C. Larkins, A.J. Kent, G. Pauliat and S. Sujecki, "Numerical modeling of photorefractive crystals for self-adapting external cavity laser mirrors," Numerical Simulation of Optoelectronic Devices (NUSOD '09). 14th - 18th September, Gwangju, South Korea (2009).

G. Adolfsson, S.M. Wang, M. Sadeghi, J. Bengtsson, A. Larsson, J.J. Lim, V. Vilokkinen and P. Melanen,, "Direct observation of lateral carrier diffusion in ridge waveguide InGaNAs lasers," IEEE Photonics Technology Letters, Vol. 21, 134 (2009).

G.A. Dimitrakis, M. George, M. Poliakoff, I. Harrison, J. Robinson, S. Kingman, E. Lester, A.P. Gregory and K. Lees, "A system for traceable measurement of the microwave complex permittivity of liquids at high pressures and temperatures," Measurement Science and Technology, Vol. 20, 045901 (2009).

C.P. West, I. Harrison, E.J. Cussen and D.H. Gregory, "Facile synthesis of bimetallic carbonitrides, V1-xTi x(C,N), by microwave carbothermal reduction-ammonolysis/carburisation (MW-CRAC) methods," Journal of the European Ceramic Society, Vol. 29, 2355 (2009).

N.A. Alahmadi, I. Harrison and K.H. Badr, "Computational measurements of commercial GaN blue light emitting diode," National Radio Science Conference (NRSC), New Cairo, Egypt (2009).

N.A. Alahmadi, I. Harrison, K.H. Badr and E.-S.A. El-Badawy, "Electrical properties measurements of commercial GaN blue light emitting diode," 6th International Symposium on High-Capacity Optical Networks and Enabling Technologies (HONET), Alexandria, Egypt (2009).

Publications for 2008

J.J. Lim, R. Mackenzie, S. Sujecki, M. Dumitrescu, S.M. Wang, M. Sadeghi, G. Adolfsson, J. Gustavsson, A. Larsson and E.C. Larkins, "Static and dynamic performance optimisation of a 1.3 µm GaInNAs ridge waveguide laser," Optical and Quantum Electronics, Vol. 40, 1181 (2008).

Z. Zhang, G. Pauliat, J.J. Lim, P.J. Bream, N. Dubreuil, A.J. Kent, E.C. Larkins and S. Sujecki, "Numerical modelling of high-power self-organising external cavity lasers," Optical and Quantum Electronics, Vol. 40, 1117 (2008).

L. Lang, J.J. Lim, S. Sujecki and E.C. Larkins,, "Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity," Optical and Quantum Electronics, Vol. 40, 1097 (2008).

H.-P. Komsa, E. Arola, E.C. Larkins and T.T. Rantala, "Band offset determination of the GaAs/GaAsN interface using the density functional theory method," Journal of Physics: Condensed Matter, Vol. 20, 315004 (2008).

M.W. Fay, Y. Han, P.D. Brown, I. Harrison, K.P. Hilton, A. Munday, D. Wallis, R.S. Balmer, M.J. Uren and T. Martin, "Structural and electrical characterization of AuPtAlTi Ohmic contacts to AlGaNGaN with varying annealing temperature and Al content," Journal of Applied Physics, Vol. 103, 074501 (2008).

R.J. Smith, M.G. Somekh, S.D. Sharples, M.C. Pitter, I. Harrison and C. Rossignol, "Parallel detection of low modulation depth signals: Application to picosecond ultrasonics," Measurement Science and Technology, Vol. 19, 055301 (2008).

K.N. Modha, B. Hayes-Gill and I. Harrison, "Low cost ultra wideband amplifier in 0.35µm CMOS process," Microwave and Optical Technology Letters, Vol. 50, 1879 (2008).

P. Dong, R. Smith, B. Hayes-Gill and I Harrison, "10.2 Gsample/S DAQ system for optical scanning acoustic microscopy using 0.35µm CMOS technology," IET Seminar on RF and Microwave IC Design, London, UK (2008).

M.I. Ali, P.L. Arnold and S. Sujecki, "Sol-gel routes to erbium doped waveguide amplifiers," International Conference on Semiconductor Materials and Optics, 9th-10th October, Warsaw (2008).

S. Sujecki, "Numerical analysis of light propagation in optical and optoelectronic devices realized using planar technology," Oficyna Wydawnicza PW, Warsaw (2008).

S. Sujecki, "Wide-angle finite-difference beam propagation in oblique coordinate system," Journal of the Optical Society of America B, Vol. 25, 138 (2008).

P.L. Arnold, J.C. Buffet, R.P. Blaudeck, S. Sujecki, A.J. Blake and C. Wilson, "C3-symmetric lanthanide tris (alkoxide) complexes formed by preferential complexation and their stereoselective polymerization of rac-lactide," Angewandte Chemie International Edition, Vol. 47, 6033 (2008).

S. Sujecki, "Generalized rectangular finite difference beam propagation method," Applied Optics, Vol. 47, 4280 (2008).

I.H. Al-Suleimani, A.J. Phillips and M.S. Woolfson, "Performance evaluation of optically preamplified dicode pulse position modulation receivers," European Transactions on Telecommunications, Vol. 19, 47 (2008).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Optical signal quality metric based on statistical moments and Laguerre expansion," Optical and Quantum Electronics, Vol. 40, 561 (2008).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Extinction ratio improvement using nonlinear four-wave mixing with assist beam," Microwave and Optical Technology Letters, Vol. 50, 2079 (2008).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Nonlinear evolution of Gaussian ASE noise in ZMNL fibre," Journal of Lightwave Technology, Vol. 26, 891 (2008).

H. Padda and A.J. Phillips, "2R optical regenerator modelling with noise redistribution by non-monotonic transfer function," Proceedings of 13th European Conference on Networks and Optical Communications (NOC), Krems, Austria, pp. 262-269 (2008).

L. Lang, J.J. Lim, S. Sujecki and E.C. Larkins, "Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity," Numerical Simulation of Optoelectronic Devices (NUSOD '08). 1st - 4th September, University of Nottingham, UK (2008).

Z. Zhang, G. Pauliat, J.J. Lim, P.J. Bream, N. Dubreuil, A.J. Kent, E.C. Larkins and S. Sujecki, "Numerical modelling of high-power self-organising external cavity lasers," Numerical Simulation of Optoelectronic Devices (NUSOD '08). 1st - 4th September, University of Nottingham, UK (2008).

R. Mackenzie, J.J. Lim, S. Bull, S. Sujecki and E.C. Larkins, "Inclusion of thermal boundary resistance in the simulation of high-power 980nm ridge waveguide lasers," Optical and Quantum Electronics, Vol. 40, 373 (2008).

L. Borruel, H. Odriozola, J.M.G. Tijero, I. Esquivias, S. Sujecki and E.C. Larkins, "Design strategies to increase the brightness of gain guided tapered lasers," Optical and Quantum Electronics, Vol. 40, 175 (2008).

W. Lu, S. Chao, S. Bull, A.V. Andrianov, V.A. Grant, R.P. Campion, C.T. Foxon, M. Sadeghi, S.M. Wang, A. Larsson and E.C. Larkins, "Photoluminescence microscopy investigation of lattice relaxation and defect formation processes in pseudomorphically strained InGaAsN multiple quantum wells," Physica Status Solidi C, Vol. 5, 467 (2008).

S. Bull, J.W. Tomm and E.C. Larkins, "Identification of degradation mechanisms in high-power laser bars using by-emitter degradation studies," Journal of Materials Science: Materials in Electronics, Vol. 19, S145 (2008).

J.J. Lim, R. Mackenzie, S. Sujecki, M. Dumitrescu, S.M. Wang, M. Sadeghi, G. Adolfsson, J. Gustavsson, A. Larsson and E.C. Larkins, "Static and dynamic performance optimisation of a 1.3 µm GaInNAs ridge waveguide laser," Numerical Simulation of Optoelectronic Devices (NUSOD '08). 1st - 4th September, University of Nottingham, UK (2008).

M. Dumitrescu, M. Wolf, K. Schulz, S.M. Wang, A. Larsson, S. Sujecki, E.C. Larkins, P. Melanen, P. Uusimaa, A. Laakso and M. Pessa, "Uncooled 10 Gb/s dilute-nitride optical transmitters for the 1300nm wavelength range," Proceedings of the 2008 International Semiconductor Conference (CAS), Vol. 1, pp. 61–70 (2008).

D. Paboeuf, G. Lucas-Leclin, P. Georges, N. Michel, M. Krakowski, J.J. Lim, S. Sujecki and E.C. Larkins, "Narrow-line coherently combined tapered diodes in a Talbot external cavity with a volume Bragg grating," Applied Physics Letters, Vol. 93, 211102 (2008).

R. Mackenzie, S. Bull, J.J. Lim, S. Chao, S. Sujecki, M. Sadeghi, S.M. Wang, A. Larsson, P. Melanen, P. Sipila, P. Uusimaa and E.C. Larkins, "Thermally dependent gain of 1.3 µm dilute nitride double quantum well lasers," Physica Status Solidi C, Vol. 5, 490 (2008).

R. Mackenzie, J.J. Lim, S., Bull, S. Sujecki and E.C. Larkins, "An investigation of thermal boundary resistance in 1.3 µm edge-emitting dilute nitride quantum well laser diodes," Physica Status Solidi C, Vol. 5, 485 (2008).

J.J. Lim, R. Mackenzie, S. Sujecki, M. Sadeghi, S.M. Wang, G. Adolfsson, Y.Q. Wei, A. Larsson, P. Melanen, P. Uusimaa, A.A. George, P.M. Smowtown and E.C. Larkins, "Thermal performance investigation of DQW GalnNAs laser diodes," Optical and Quantum Electronics, Vol. 40, 385 (2008).

S. Bull, C.K. Amuzuvi, J.W. Tomm, R. Xia, J.J. Lim, S., Sujecki and E.C Larkins, "By emitter degradation analysis in high power laser bars: Experiment and emulation," Photonex '08, 14th October, Coventry, UK (2008).

J.J. Lim, R. Mackenzie, L. Lang, Z. Zhang, S. Bull, P.J. Bream, E.C. Larkins and S. Sujecki, "State of the art in high brightness laser diode simulation at the University of Nottingham," Photonex '08, 14th October, Coventry, UK (2008).

G. Adolfsson, S.M. Wang, M. Sadeghi, J. Bengtsson, A. Larsson, J.J. Lim, V. Vilokkinen and P. Melanen,, "Effects of lateral diffusion on the temperature sensitivity of the threshold current for 1.3-µm double quantum-well GaInNAs-GaAs lasers," IEEE Journal of Quantum Electronics, Vol. 44, 607 (2008).

Publications for 2007

S. Bull, J.W. Tomm and E.C. Larkins, "Identification of degradation mechanisms in high-power laser bars using by-emitter degradation studies," 12th International Conference on Defects: Recognition, Imaging and Physics in Semiconductors (DRIP-XII), Berlin, Germany (2007).

R. MacKenzie, J.J. Lim, S. Bull, S. Sujecki, A.J. Kent and E.C. Larkins, "The impact of hot-phonons on the performance of 1.3µm dilute nitride edge-emitting quantum well lasers," 12th International Conference on Phonon Scattering in Condensed Matter, Paris, France (2007).

N.A. Alahmadi, I. Harrison and K.H. Badr, "The electrical characteristic of commercial GaN blue light emitting diode," International Semiconductor Device Research Symposium, College Park, MD, USA (2007).

M.X. Li, B.R. Hayes-Gill, M. Clark, M. Pitter, M.G. Somekh and I. Harrison, "5-GHz optical front-end for active pixel applications in standard 0.35-µm CMOS," Silicon Photonics II Vol. 6477, 47708 (2007).

S. Sujecki, "Stability of steady state high power semiconductor laser models," Journal of the Optical Society of America B, Vol. 24, 1053 (2007).

M.P. Dlubek, A.J. Phillips and E.C. Larkins, "Simple and cost-effective OSNR monitoring method based on modulation spectrum assessment," Proceedings of the 12th European Conference on Networks and Optical Communications (NOC), Kista, Sweden, pp. 168–175 (2007).

J.M.G. Tijero, H. Odriozola, L. Borruel, I. Esquivias, S. Sujecki and E.C. Larkins, "Enhanced brightness of tapered laser diodes based on an asymmetric epitaxial structure," IEEE Photonic Technology Letters, Vol. 19, 1640 (2007).

V.A. Grant, R.P. Campion, C.T. Foxon, W. Lu, S. Chao and E.C. Larkins, "Optimisation of RF plasma sources for the MBE growth of nitride and dilute nitride semiconductor material," Semiconductor Science and Technology, Vol. 22, 15 (2007).

J.W. Tomm, J. Jimenez, M. Oudart, J. Nagle, E.C. Larkins and S. Bull, "Degradation Modes and Related Defects in High-Power Laser Bars," In: J.W. Tomm and J. Jimenez, Eds. "Screening and Packaging Techniques for Highly Reliable Quantum-Well High-Power Laser Arrays," McGraw-Hill Publishing Co. (2007).

M. Oudart, J. Nagle, J.W. Tomm, E.C. Larkins and S. Bull, "Failure Prediction of High-Power Laser Bars," In: J.W. Tomm and J. Jimenez, Eds. "Screening and Packaging Techniques for Highly Reliable Quantum-Well High-Power Laser Arrays," McGraw-Hill Publishing Co. (2007).

S. Bull, M. Baeumler, J. Jimenez and E.C. Larkins, "Laser Facet Inspection by Imaging Techniques," In: J.W. Tomm and J. Jimenez, Eds. "Screening and Packaging Techniques for Highly Reliable Quantum-Well High-Power Laser Arrays," McGraw-Hill Publishing Co. (2007).

J.J. Lim, R. Mackenzie, S. Sujecki, M. Sadeghi, S.M. Wang, Y.Q. Wei, J.S. Gustavsson, A. Larsson, P. Melanen, P. Sipila, P. Uusimaa, A.A. George, P.M. Smowton and E.C. Larkins, "Simulation of double quantum well GalnNAs laser diodes," IET Optoelectronics, Vol. 1, 259 (2007).

R. Mackenzie, J.J. Lim, S. Bull, S. Chao, S. Sujecki, M. Sadeghi, S.M. Wang, A. Larsson, P. Melanen, P. Sipila, P. Uusimaa and E.C. Larkins, "Measurement of optical gain, effective group index and linewidth enhancement factor in 1.3 µm dilute nitride double-quantum-well lasers," IET Optoelectronics, Vol. 1, 284 (2007).

R. Mackenzie, J.J. Lim, A.J. Kent, S. Sujecki and E.C. Larkins, "The impact of hot-phonons on the performance of 1.3 µm dilute nitride edge emitting quantum well lasers," Proceedings of Phonons 2007, 16th-20th July, Paris (2007).

P. Bream, R. Mackenzie, J.J. Lim, S. Bull, A.V. Andrianov, A.J. Kent, S. Sujecki and E.C. Larkins, "Nonequilibrium gain and nonlinear optical response of QWs," Workshop on Nonlinear Dynamics in Semiconductor Lasers, WIAS Institute, Berlin, Germany (2007) INVITED.

R. Mackenzie, J.J. Lim, S. Bull, R. Dykeman, S. Sujecki, E.C. Larkins, M. Sadeghi, S.M. Wang, A. Larsson, P. Melanen, P. Sipila and P. Uusimaa, "Thermal performance of 1.3 µm InGaAsN/GaAs laser diodes ," Proceedings of the European Semiconductor Laser Workshop, 14th-15th September, Berlin (2007).

R. Mackenzie, J.J. Lim, S. Bull, S. Sujecki and E.C. Larkins, "An investigation of thermal boundary resistance in 1.3 µm dilute nitride double quantum well lasers," Proceedings of the E-MRS Spring Meeting, Symposium F Novel Gain Materials and Devices Based on III-V Compounds, 1st June, Strasbourg, (2007).

R. Mackenzie, J.J. Lim, S. Bull, S. Chao, S. Sujecki, M. Sadeghi, S.M. Wang, A. Larsson, P. Melanen, P. Sipila, P. Uusimaa and E.C. Larkins, "Thermally dependent gain of 1.3 µm dilute nitride double quantum well lasers," Proceedings of the E-MRS Spring Meeting, Symposium F Novel Gain Materials and Devices Based on III-V Compounds, 31st May, Strasbourg, (2007).

M. Dumitrescu, A. Larsson, Y.Q. Wei, E.C. Larkins, P. Uusimaa, K. Schulz and M. Pessa, "High-performance 1.3µm dilute-nitride edge-emitting lasers," Proceedings of the 2007 International Semiconductor Conference (CAS), Vol. 1, pp. 165-174 (2007).

A.J. Phillips, "Power penalty for burst mode reception in the presence of interchannel crosstalk," IET Optoelectronics, Vol. 1, 127 (2007).

T.J. Zuo and A.J. Phillips, "Novel penalty analysis for optically preamplified burst mode receivers," Proceedings of the 12th European Conference on Networks and Optical Communications (NOC), Kista, Sweden. pp. 433–440 (2007).

F. Yan, A.J. Phillips and I. Harrison, "The impact of ASE noise in optically amplified radio over fibre systems," Proceedings of the 12th European Conference on Networks and Optical Communications (NOC), Kista, Sweden. pp. 220–227 (2007).

R. Ma, A.J. Phillips and S. Sujecki, "Improved performance evaluation of WDM systems in the presence of ASE and interchannel crosstalk," Proceedings of the 12th European Conference on Networks and Optical Communications (NOC), Kista, Sweden, pp. 176–183 (2007).

H. Odriozola, J.M.G. Tijero, L. Borruel, S. Sujecki, E.C. Larkins and I. Esquivias, "Simulation of tapered lasers with separate contacts," Proceedings of the 2007 Spanish Conference on Electron Devices, pp. 56–59 (2007).

R. Mackenzie, J.J. Lim, S. Bull, S. Sujecki and E.C. Larkins, "The impact of thermal boundary resistance in optoelectronic devices," Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), pp. 15–16 (2007).

J.J. Lim, R. Mackenzie, S. Sujecki, M. Sadeghi, S.M., Wang, Y.Q. Wei, A. Larsson, P. Melanen, P. Uusimaa, A.A. George, P.M. Smowton and E.C. Larkins, "Thermal performance investigation of DQW GaInNAs laser diodes," Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), pp. 19–20 (2007).

H. Odriozola, J.M.G. Tijero, L. Borruel, I. Esquivias, H. Wenzel, F. Dittmar, K. Paschke, B. Sumpf, G. Erbert, S. Sujecki and E.C. Larkins, "High power 980 nm tapered lasers with separate contacts: Numerical simulation and comparison with experiments," Proceedings of the European Conference on Lasers and Electro-Optics (CLEO-Europe) (2007).

Publications for 2006

S. Bull, J.J. Lim, P.J. Bream, S. Sujecki and E.C. Larkins, "Full Spectral simulation of high-brightness laser diodes," European Semiconductor Laser Workshop, Nice, France (2006).

G. Moldovan, M.J. Roe, I. Harrison, M. Kappers, C.J. Humphreys and P.D. Brown, "Effects of KOH etching on the properties of Ga-polar n-GaN surfaces," Philosophical Magazine, Vol. 86, 2315 (2006).

M. Li, B. Hayes-Gill and I. Harrison, "6 GHz transimpedance amplifier for optical sensing system in low-cost 0.35-µm CMOS," Electronics Letters, Vol. 42, 1278 (2006).

P. Dong, B. Hayes-Gill and I. Harrison, "Simple optimising methodology for static frequency divider design," Electronics Letters, Vol. 42, 1267 (2006).

C.E. Martinez, N.M. Stanton, A.J. Kent, M.L. Williams, I. Harrison, H. Tang, J.B. Webb and J.A. Bardwell, "Energy relaxation by hot 2D electrons in AlGaN/GaN heterostructures: The influence of strong impurity and defect scattering," Semiconductor Science and Technology, Vol. 21, 1580 (2006).

V.K. Sundaramoorthy, C.T. Foxon, S.V. Novikov, K.W. Edmonds and I. Harrison, "Conductivity of cubic GaMnN grown on undoped GaN layers," Proceedings of the IEEE International Conference on Semiconductor Electronics, pp. 915–918 (2006).

A.J. Phillips, "Burst mode penalty evaluation in the presence of interchannel crosstalk," 11th European Conference on Networks and Optical Communications (NOC), pp. 300-307 (2006).

P.J. Bream, J.J. Lim, S. Bull, A.V. Andrianov, S. Sujecki and E.C. Larkins, "The impact of nonequilibrium gain in a spectral laser diode model," Optical and Quantum Electronics, Vol. 38, 1019 (2006).

S. Sujecki, "Modelling of high power tapered laser diodes," Proceedings of the International Conference on Transparent Optical Networks (ICTON), Nottingham, UK., Vol. 1, 175 (2006).

H. Odriozola, N. Michel, J.M.G. Tijero, L. Borruel, R. Ibanez, M. Krakowski, I. Hassiaoui, M. Calligaro, O. Parillaud, S. Sujecki and E.C. Larkins, "Quasi-three dimensional simulation of 915nm ridge waveguide laser diodes," 8th Reunion Nacional de Optica, Alicante, Spain (2006).

P.J. Bream, J.J. Lim, S. Bull, S. Sujecki and E.C. Larkins, "The impact of nonequilibrium gain in a spectral laser model," Proceedings of NUSOD 06: 6th International Conference on Numerical Simulation of Optoelectronic Devices. Sept. 11th - 14th, Singapore (2006).

J. Piprek, E.C. Larkins and S.F Yu, "Introduction to the OQE special issue on "Numerical Simulation of Optoelectronic Devices"," Optical and Quantum Electronics, Vol. 38, 933 (2006).

P.J. Bream, S. Sujecki and E.C. Larkins, "Numerically efficient representation of anisotropic valence bands in semiconductor optoelectronic devices," IEEE Photonics Technology Letters, Vol. 18, 1374 (2006).

P.J. Bream, S. Sujecki and E.C. Larkins, "Investigation of nonequilibrium steady state gain in semiconductor quantum wells," Semiconductor and Integrated Optoelectronics (SIOE) Conference, Cardiff, UK (2006).

S. Bull, A.V. Andrianov, J.G. Wykes, J.J. Lim, S. Sujecki, S.C. Auzanneau, M. Calligaro, M. Lecomte, O. Parillaud, M. Krakowski and E.C. Larkins, "Quantitative imaging of intracavity spontaneous emission distributions using tapered lasers with windowed backside contacts," IEE Proceedings - Optoelectronics, Vol. 153, 2 (2006).

Publications for 2005

S. Bull, A.V. Andrianov, I. Harrison, M. Dorin, R.B. Kerr, J. Noto and E.C. Larkins, "A spectroscopically resolved photo- and electroluminescence microscopy technique for the study of high-power and high-brightness laser diodes," IEEE Transactions on Instrumentation and Measurement, Vol. 54, 1079 (2005).

S. Sujecki and E.C. Larkins, "Bent waveguide laser cavities," SPIE International Congress on Optics and Optoelectronics, Warsaw, Poland (2005).

S. Bull, J.W. Tomm, M. Oudart, J. Nagle, C. Scholz, K. Boucke, I. Harrison and E.C. Larkins, "By-emitter degradation analysis of high-power laser bars," Journal of Applied Physics, Vol. 98, 63101 (2005).

J.J. Lim, S. Sujecki, E.C. Larkins, "Characterisation of high speed InGaAs MQW lasers using an accurate dynamic laser simulation tool," European Semiconductor Laser Workshop, Glasgow, UK (2005).

L. Borruel, I. Esquivias, P. Moreno, M. Krakowski, S.C. Auzanneau, M. Calligaro, S. Sujecki, J.G. Wykes and E.C. Larkins, "Clarinet laser: Semiconductor laser design for high-brightness applications," Applied Physics Letters, Vol. 87, 101104 (2005).

L. Borruel, I. Esquivias, J.M. García-Tijero, H. Odriozola, M. Krakowski, S.C. Auzanneau, N. Michel, S. Sujecki and E.C. Larkins, "Design and fabrication of high brightness semiconductor tapered lasers with a clarinet-like shape," Proceedings of the Conference on Lasers and Electro-Optics (2005).

J.J. Lim, T.M. Benson and E.C. Larkins, "Design of wide-emitter single-mode laser diodes," IEEE Journal of Quantum Electronics, Vol. 41, 506 (2005).

A.V. Andrianov, S.V. Novikov, I.S. Zhuravlev, T. Li, R. Xia, S. Bull, I. Harrison, E.C. Larkins and C.T. Foxon, "Efficient near IR photoluminescence from gallium nitride layers doped with arsenic," Semiconductors, Vol. 39, 73 (2005).

P. Bream, S. Sujecki, E.C. Larkins, "Energy band calculations for dynamic gain models in semiconductor quantum well lasers," Proceedings of the 5th International Conference on the Numerical Simulation of Optoelectronic Devices (NUSOD), 11 (2005).

P. Bream, S. Bull, I. Harrison, S. Sujecki and E.C. Larkins, "Fourier transform analysis method for modeling the positions and properties of cavity defects in Fabry–Pérot laser diodes," Applied Physics Letters, Vol. 86, 061104 (2005).

N. Michel, M. Krakowski, M. Calligaro, M. Lecomte, O. Parillaud, L. Borruel, I. Esquivias, P. Moreno, S. Sujecki, J. Wykes and E.C. Larkins, "High-power and high-brightness lasers with an Al-free active region at 915 nm," European Conference on Optical Communications (ECOC 2005), Glasgow, Scotland, UK (2005).

G.A. Dimitrakis and T.E. Cross, "High temperature microwave dielectric properties of nano and microscale yttria stabilised zirconia," 10th Int. Conf. on Microwave & High Frequency Heating in Modena, Italy, September 2005 (2005).

T.E. Cross and G.A. Dimitrakis, "High temperature microwave dielectric properties of ZrO₂-Y₂O₃ nano and micro powders," 4th World Congress on Microwave and RF Applications, Austin, USA, November 2005 (2005).

M. Krakowski, M. Calligaro, N. Michel, M. Lecomte, O. Parillaud, L. Borruel, I. Esquivias, P. Moreno, S. Sujecki, J. Wykes and E.C. Larkins, "Lasers évasés de forte puissance et forte brillance sans aluminium dans la région active à 915 nm," Neuvième Colloque sur les Lasers et l'Optique Quantique (COLOQ 9), Dijon, France (2005).

H. Odriozola, L. Borruel, J.M.G. Tijero, I. Esquivias, S. Sujecki and E.C. Larkins, "Losses of the unstable cavity in tapered laser diodes: Estimation from numerical simulataions," Proceedings of the 5th International Conference on the Numerical Simulation of Optoelectronic Devices (NUSOD), 31 (2005).

M.G. Tijero, D. Rodríguez, L. Borruel, S. Sujecki, E.C. Larkins and I. Esquivias, "Optimization of epitaxial layer design for high brightness tapered lasers," Proceedings SPIE (2005).

S. Bull, S. Sujecki, J.J. Lim, L. Borruel, I. Esquivias, E.C. Larkins, "Tapered lasers with a two stage amplifier section," European Semiconductor Laser Workshop, Glasgow, UK (2005).

Publications for 2004

L. Borruel, S. Sujecki, J.G. Wykes, H. Wenzel, E.C. Larkins and I. Esquivias, "Analysis of beam quality limitations in high brightness gain guided tapered lasers," Proceedings of the 4th International Conference on the Numerical Simulation of Optoelectronic Devices (NUSOD), 9 (2004).

G. Moldovan, I. Harrison, C.J. Humphreys, M. Kappers and P.D. Brown, "Application of the Taguchi method for assessment of surface treatment procedures for Ti/n-type GaN contacts," Materials Science and Technology, Vol. 20, 533 (2004).

E.V. Bekker, T.M. Benson and E.C Larkins, "Band gap engineering in 2D photonic crystals: The influence of element shape and rotational angle," Proceedings of the International Conference on Transparent Optical Networks (2004).

G. Moldovan, I. Harrison, M. Roe and P.D. Brown, "Correlation of electrical and structural properties of Au contacts to KOH treated n-GaN," Institute of Physics Conference Series, Vol. 179, 115 (2004).

G. Moldovan, I. Harrison and P.D. Brown, "EBIC study of Au/n-type GaN Schottky contacts," Institute of Physics Conference Series, Vol. 180, 115 (2004).

T.E. Cross and G.A. Dimitrakis, "High temperature microwave dielectric properties of ceramic nano-powders: A preliminary study," Institute of Physics, Dielectrics at Meso- and Nano-scales Conference, Canterbury, Kent, UK (2004).

C.E. Martinez, N.M. Stanton, A.J. Kent, M.L. Williams, I. Harrison, H. Tang, J.B. Webb and J.A. Bardwell, "Hot electron energy relaxation in AlGaN/GaN heterostructures," Semiconductor Science and Technology, Vol. 19, S440 (2004).

S. Bull, J.G. Wykes, A.V. Andrianov, J.J. Lim, L. Borruel, S. Sujecki, S.C. Auzanneau, M. Calligaro, M. Krakowski, I. Esquivias and E.C. Larkins, "Imaging of spontaneous emission from 980 nm tapered lasers with windowed n-contacts," European Physical Journal - Applied Physics, Vol. 27, 455 (2004).

J.J. Lim, T.M. Benson and E.C. Larkins, "Investigation of factors influencing the brightness of borad-area high-power laser diodes," Proceedings of the 4th International Conference on the Numerical Simulation of Optoelectronic Devices (NUSOD), 7 (2004).

L. Borruel, S. Sujecki, P. Moreno, J.G. Wykes, P. Sewell, T.M. Benson, E.C. Larkins and I. Esquivias, "Modelling of patterned contacts in tapered lasers," IEEE Journal of Quantum Electronics, Vol. 40, 1384 (2004).

G. Moldovan, I. Harrison and P.D. Brown, "Noise deconvolution for area fraction measurements," Materials Science and Technology, Vol. 20, 16 (2004).

S. Sujecki, L. Borruel, J.G. Wykes, P. Sewell, T.M. Benson, I. Esquivias and E.C. Larkins, "Quasi-3D numerical analysis of asymmetries in 980nm tapered laser diodes," Proceedings of the International Conference on Transparent Optical Networks (2004).

L. Borruel, S. Sujecki, P. Moreno, J.G. Wykes, M. Krakowski, B. Sumpf, P. Sewell, S.C. Auzanneau, H. Wenzel, D. Rodriguez, T.M. Benson, E.C. Larkins and I. Esquivias, "Quasi-3D simulation of high brightness tapered lasers," IEEE Journal of Quantum Electronics, Vol. 40, 463 (2004).

M.W. Fay, G. Moldovan, N.J. Weston, P.D. Brown, I. Harrison, K.P. Hilton, A. Masterton, D. Wallis, R.S. Balmer, M.J. Uren and T. Martin, "Structural and electrical characterization of AuPdAlTi ohmic contacts to AlGaN/GaN with varying Ti content," Journal of Applied Physics, Vol. 96, 5588 (2004).

M.W. Fay, I. Harrison, E.C. Larkins, S.V. Novikov, C.T. Foxon and P.D. Brown, "TEM assessment of As-doped GaN epitaxial layers grown on sapphire," Institute of Physics Conference Series, Vol. 179, 23 (2004).

M.W. Fay, G. Moldovan, I. Harrison, R.S. Balmer, D.E.J. Soley, K.P. Hilton, B.T. Hughes, M.J. Uren, T. Martin and P.D. Brown, "TEM studies of multilayer ohmic contacts to n-type AlGaN/GaN," Institute of Physics Conference Series, Vol. 180, 483 (2004).

S. Bull, A.V. Andrianov, I. Harrison and E.C. Larkins, "The study of strain and defects in high power laser diodes by spectroscopically resolved photoluminescence microscopy," European Physical Journal - Applied Physics, Vol. 27, 469 (2004).

I. Harrison, M. Dahlstrom, S. Krishnan, Z. Griffith, Y.M. Kim and M.J.W. Rodwell, "Thermal limitations of InP HBTs in 80-and 160-Gb ICs," IEEE Transactions on Electron Devices, Vol. 51, 529 (2004).

K. Biwojno, S. Sujecki, A. Vukovic, T.M. Benson and P. Sewell, "Thermal models for silicon-on-insultator-based optical circuits," Optica Applicata, XXXIV (2004).

Publications for 2003

S. Bull, J.G. Wykes, A.V. Andrianov, J.J. Lim, L. Borruel, S. Sujecki, S.C Auzanneau, M. Calligaro, M. Krakowski, I. Esquivias and E.C. Larkins, "Imaging of spontaneous emission from 980 nm tapered lasers with windowed n-contacts," 10th International Conference on Defects: Recognition, Imaging and Physics in Semiconductors (DRIP-X), Batz-sur-Mer, France (2003).

S. Bull, A.V. Andrianov, I. Harrison and E.C. Larkins, "The study of strain and defects in high power laser diodes by spectroscopically resolved photoluminescence microscopy," 10th International Conference on Defects: Recognition, Imaging and Physics in Semiconductors (DRIP-X), Batz-sur-Mer, France (2003).

C.T. Foxon, S.V. Novikov, T. Li, R.P. Campion, A.J. Winser, I. Harrison, M.J. Kappers and C.J. Humphreys , "Arsenic incorporation in GaN during growth by molecular beam epitaxy," Journal of Crystal Growth, Vol. 251, 510 (2003).

L. Borruel, S. Sujecki, D. Rodríguez, J.G. Wykes, M. Krakowski, P. Moreno, P. Sewell, T.M. Benson, E.C. Larkins and I. Esquivias, "Beam filamentation and maximum optical power in high brightness tapered lasers," Proceedings SPIE, Vol. 4986, 423 (2003).

S.V. Novikov, A.J. Winser, T. Li, R.P. Campion, I. Harrison and C.T. Foxon, "Bismuth a new dopant for GaN films grown by molecular beam epitaxy - surfactant effects, formation of GaN_1-xBi_x alloys and co-doping with arsenic," Journal of Crystal Growth, Vol. 247, 35 (2003).

S.V. Novikov, L.X. Zhao, A.J. Winser, M. Kappers, J.S. Barnard, I. Harrison, C.J. Humphreys and C.T. Foxon, "Blue emission from As-doped GaN films grown by molecular beam epitaxy on GaN templates," Journal of Crystal Growth, Vol. 256, 237 (2003).

Y. Zhang, J.J. Lim, T.M. Benson, P. Sewell, S.R.A. Dods and E.C. Larkins, "Design and optimisation of high-brightness 980 nm laser diodes with distributed phase correction," Optical and Quantum Electronics, Vol.35, 887

S. Bull, A.V. Andrianov, I. Harrison and E.C. Larkins, "Development of a spectroscopically resolved photoluminescence microscopy technique for studying strain and defects in high power laser diodes," Europhysics Conference Abstracts - CLEO Europe 2003, Vol. 27E, CC4-04-MON (2003).

S.V. Novikov, L.X. Zhao, I. Harrison and C.T. Foxon, "Isoelectronic doping of AlGaN alloys," Physica Status Solidi B: Basic Research, Vol. 240, 408 (2003).

C.T. Foxon, S.V. Novikov, L.X. Zhao and I. Harrison, "Isoelectronic doping of AlGaN alloys with As and estimates of AlGaN/GaN band offsets," Applied Physics Letters, Vol. 83, 1166 (2003).

A.V. Andrianov, S.V. Novikov, T. Li, R. Xia, S. Bull, I.S. Zhuravlev, I. Harrison, E.C. Larkins and C.T. Foxon, "Luminescence from GaAs nanocrystals self-organised in GaN:As matrix grown by MBE," Abstracts of VI Russian Conference on Physics of Semiconductors, Vol. Cht-H2-2.3u, 159 (2003).

R. Xia, A.V. Andrianov, S. Bull, I. Harrison, J.P. Landesman and E.C. Larkins, "Micro-electroluminescence spectroscopy investigation of mounting-induced strain and defects on high power GaAs/AlGaAs laser diodes," Optical and Quantum Electronics, Vol. 35, 1099 (2003).

J.J. Lim, T.M. Benson and E.C. Larkins, "Modal discrimination in broad area high power laser diodes," Nordic Semiconductor Meeting (2003).

K. Biwojno, S. Sujecki, P. Sewell and T. M. Benson, "Numerical analysis of thermal switching in silicon based integrated optical devices," Proceedings SPIE, Vol. 5125, 252 (2003).

S. Sujecki, L. Borruel, J.G. Wykes, P. Moreno, B. Sumpf, P. Sewell, H. Wenzel, T.M. Benson, G. Erbert, I. Esquivias and E.C. Larkins, "Nonlinear properties of tapered laser cavities," IEEE Journal of Selected Topics in Quantum Electronics, Vol. 9, 823 (2003).

S. Sujecki, J.G. Wykes, P. Sewell, A. Vukovic, T.M. Benson, E.C. Larkins, L. Borruel and I. Esquivias, "Optical properties of tapered laser cavities," IEE Proceedings - Optoelectronics, Vol. 150, 246 (2003).

A.V. Andrianov, S.V. Novikov, T. Li, R. Xia, S. Bull, I. Harrison, E.C. Larkins and C.T. Foxon, "Photoluminescence from self-assembled GaAs-based nanocrystals embedded in a GaN host crystal," Physica Status Solidi B: Basic Research, Vol. 238, 204 (2003).

D. Rodriguez, P. Moreno, L. Borruel, S. Sujecki, M. Krakowski, J.G. Wykes, E.C. Larkins and I. Esquivias, "Quasi three dimemsional similation of ridge waveguide laser diodes," Conferincia de Dispotivos Electronicos (2003).

A.V. Andrianov, S.V. Novikov, T. Li, I.S. Zhuravlev, I. Harrison, E.C. Larkins and C.T. Foxon, "Study of photoluminescence from self-formed GaAs nanocrystallites in As-doped GaN grown by molecular beam epitaxy," Semiconductor Science and Technology, Vol. 18, 997 (2003).

R. Belka, S. Sujecki, L. Borruel, J.G. Wykes, G. Erbert, I. Esquivias, P. Sewell, T.M. Benson, P. Moreno, H. Wenzel, B. Sumpf and E.C. Larkins, "Symulacje pólprzewodnikowych laserów duzej mocy z sekcja stozkowa," II Krajowej Konferencji Elektroniki (II KKE), 443 (2003).

P. Bream, S. Bull, R. Xia, A.V. Andrianov, I. Harrison and E.C. Larkins, "The influence of defects on the emission spectra of high power laser diodes," Europhysics Conference Abstracts - CLEO Europe 2003, Vol. 27E, CC2M (2003).

T.E. Cross and G.A. Dimitrakis, "The use of cavity perturbation theory for high temperature dielectric measurements," 9th International Conference on Microwave and High Frequency Heating, Loughborough, UK (2003).

I. Harrison, M. Dahlstrom, S. Krishnan, Z. Griffith, Y.M. Kim and M.J.W. Rodwell, "Thermal limitations of InP HBT’s in 80 and 160 Gbits^-1 ICs," Proceedings of Indium Phosphide and Related Materials, Santa Barbara, CA, USA, 160 (2003).

J.G. Wykes, J. Bonnyman, P. Sewell, T.M. Benson, S. Sujecki and E.C. Larkins, "Utilisation of parallel processing techniques to maximise the efficiency of an advanced high-power semiconductor laser model," Proceedings of the 11th International Workshop on Optical Waveguide Theory and Numerical Modelling, 99 (2003).

S. Sujecki, P. Sewell and T.M. Benson, "Wide angle oblique beam propagation," Proceedings of the 5th International Conference on Transparent Optical Networks, Vol. 2, 26 (2003).

Publications for 2002

P. Sewell, K. Biwojno, S. Sujecki and T.M. Benson, "A thermal model for silicon-on-insulator-based waveguide modulators," Proceedings of the 4th International Conference on Transparent Optical Networks, Vol. 1, 151 (2002).

K. Biwojno, S. Sujecki, P. Sewell and T.M. Benson, "Analiza przelaczania termicznego w ukladach optyki zintegrowanej wykonanych na podlozu krzemu," Elektronika, Vol. 43, 43 (2002).

C.T. Foxon, S.V. Novikov, T. Li, R.P. Campion, A.J. Winser and I. Harrison, "Bismuth a new surfactant or contact for GaN films grown by molecular beam eptiaxy," Physica Status Solidi A: Applied Research, Vol. 192, 441 (2002).

C. Trager-Cown, F. Sweeney, J. Hastie, S.K. Manson-Smith, D.A. Cowan, D. McColl, A. Mohammed, K.P. O'Donnell, D. Zubia, S.D. Hersee, C.T. Foxon, I. Harrison and S.V. Novikov, "Characterization of nitride thin films by electron backscatter diffraction," Journal of Microscopy, Vol. 205, 226 (2002).

J.G. Wykes, L. Borruel, S. Sujecki, P. Sewell, T.M. Benson, E.C. Larkins and I. Esquivias, "Convergence behaviour of coupled electromagnetic/electronic high power laser models," IEE Fourth International Conference in Electromagnetics CEM-2002, 2002/063 (2002).

S. Sujecki, L. Borruel, J.G. Wykes, T.M. Benson, P. Sewell, P.D. Moreno, I. Esquivias and E.C. Larkins, "Design of high power pump lasers for C-band EDFA amplifiers," Proceedings of the 4th International Conference on Transparent Optical Networks, Vol. 2, 146 (2002).

Y. Zhang, J.J. Lim, T.M. Benson, P. Sewell, S.R.A. Dods and E.C. Larkins, "Design of short-cavity high-brighteness 980 mn laser diodes with disturbed phase correction," Applied Physics Letters, Vol. 80, 3506 (2002).

L. Borruel, S. Sujecki, S.C. Auzanneau, B. Sumpf, P. Moreno, J.G. Wykes, M. Krakowski, G. Erbert, D. Rodriguez, P. Sewell, M. Calligaro, H. Wenzel, T.M. Benson, E.C. Larkins and I. Esquivias, "High brightness tapered lasers at 732 nm and 975 nm: Experiments and numerical analysis,," IEEE 18th International Semiconductor Laser Conference, 89 (2002).

J.G. Wykes, L. Borruel, S. Sujecki, I. Esquivias, P. Sewell, T.M. Benson, E.C. Larkins, P. Moreno and M. Krakowski, "Hot-cavity modelling of high-power tapered laser diodes using wide-angle 3D FD-BPM," The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, Vol. 1, 91 (2002).

C.S. Davis, A.V. Andrianov, A.J. Winser, S.V. Novikov, R. Xia, C.R. Staddon, I. Harrison, E.C. Larkins and C.T. Foxon, "MBE growth and characterisation of N-dilute GaAsN films on misoriented GaAs substrates," Conference on Semiconductor and Integrated Optoelectronics (SIOE) (2002).

R. Xia, E.C. Larkins, I. Harrison, S.R.A. Dods, A.V. Andrianov, J.M. Morgan and J.P. Landsman, "Mounting-induced strain threshold for the degradation of high-power AlGaAs laser bars," IEEE Photonics Technology Letters, Vol. 14, 893 (2002).

C. Mavroidis, J.J. Harris, R.B. Jackman, I. Harrison, B.J. Ansell, Z. Bougrioua and I. Moerman, "Multiple parallel conduction paths observed in depth-profiled n-GaN epilayers," Journal of Applied Physics, Vol. 91, 9835 (2002).

A.V. Andrianov, S.V. Novikov, R. Xia, S. Bull, A.J. Winser, C.R. Staddon, I. Harrison, E.C. Larkins and C.T. Foxon, "Near-infrared emission from MBE grown As-doped GaN," Proceedings of the 26th International Conference on the Physics of Semiconductors (2002).

S. Sujecki, L. Borruel, J.G. Wykes, G. Erbert, I. Esquivias, P. Sewell, T.M. Benson, P. Moreno, H. Wenzel, B. Sumpf and E.C. Larkins, "Nonlinear photon-carrier interactions in high power 735nm tapered laser diodes," Proceedings of the 2nd International Conference on the Numerical Simulation of Optoelectronic Devices (NUSOD), 6 (2002).

S.A. Cavill, A.V. Akimov, N.M. Stanton, A.J. Kent, S.V. Novikov, I. Harrison and C.T. Foxon, "Nonradiative processes and phonon emission in GaAsN alloys," Physica B - Physics of Condensed Matter, Vol. 316, 114 (2002).

Y. Zhang, J.J. Lim, T.M. Benson, P. Sewell and E.C. Larkins, "Novel design of laser diodes with distributed phase correction," Proceedings of the 10th International Workshop on Optical Waveguide Theory and Numerical Modelling, University of Nottingham, 65 (2002).

K. Biwojno, S. Sujecki, P. Sewell and T.M. Benson, "Numerical analysis of thermal switching in silicon based integrated optical devices," Photonics Applications in Astronomy, Communications, Industry and High-Energy Phsyics Experiments - 10th Symposium on Photonics and HEP Experimentms, 252 (2002).

C.T. Foxon, S.V. Novikov, T. Li, R.P. Campion, A.J. Winser and I. Harrison, "Optimisation of the blue emission from As-doped GaN films grown by molecular beam epitaxy," Physica Status Solidi A: Applied Research, Vol. 192, 39 (2002).

S. Sujecki, J.G. Wykes, P. Sewell, T.M. Benson, E.C. Larkins, L. Borruel, I. Esquivias, J. Arias, B. Romero, G. Erbert, H. Wenzel and B. Sumpf, "Quasi-3D optoelectronic modelling of 730 nm tapered laser diodes," Lasers and Electro-Optics 2002, CLEO'02, Technical Digest, 598 (2002).

L. Borruel, I. Esquivias, S. Sujecki, E.C. Larkins, P. Sewell, T.M. Benson and J.G. Wykes, "Self-consistent electrical, thermal and optical model of high-brightness tapered lasers," Proceedings SPIE, Vol. 4646, 355 (2002).

R. Xia, I. Harrison, E.C. Larkins, A.V. Andrianov, S.R.A. Dods, J.M. Morgan, P.J. Parbrook, C.C. Button and G. Hill, "Spatial inhomogenity investigations of QW emission in InGaN MQW LEDs," Materials Science and Engineering, Vol. B93, 234 (2002).

C.T. Foxon, S.V. Novikov, T. Li, R.P. Campion, C.S. Davis, A.J. Winser, I. Harrison and Y. Liao, "Strong blue emission from GaN isoelectronically doped with arsenic," Materials Science and Engineering, Vol. B93, 35 (2002).

M.W. Fay, G. Moldovan, P.D. Brown, I. Harrison, J.C. Birbeck, B.T. Hughes, M.J. Uren and T. Martin, "Structural and electrical characteriszation of AuTiAlTi/AlGaN/GaN ohmic contacts," Journal of Applied Physics, Vol. 92, 94 (2002).

R. Xia, E.C. Larkins, I. Harrison, S.R.A. Dods, A.V. Andrianov, J.M. Morgan and J.P. Landsman, "The effect of mounting induced strain and defects on the properties of AlGaAs 808 nm laser diodes," Synthetic Metals, Vol. 127, 255 (2002).

C.T. Foxon, I. Harrison, S.V. Novikov, A.J. Winser, R.P. Campion and T. Li, "The growth and properties of GaN:As layers prepared by plasma-assisted molecular beam epitaxy," Journal of Physics: Condensed Matter, Vol. 14, 3383 (2002).

C.T. Foxon, I. Harrison, S.V. Novikov, T. Li, R.P. Campion, C.R. Staddon, C.S. Davis, A.J. Winser, A.P. Kovarsky and B.J. Ber, "The influence of arsenic incorporation on the optical properties of As-doped GaN films grown by molecular beam epitaxy using As-4 molecules," Journal of Crystal Growth, Vol. 234, 343 (2002).

S.V. Novikov, A.J. Winser, A. Bell, I. Harrison, T. Li, R.P. Campion, C.R. Staddon, C.S. Davis, F.A. Ponce and C.T. Foxon, "The transition from As-doped GaN, showing blue emission, to GaNAs alloys in films grown by molecular beam epitaxy," Journal of Crystal Growth, Vol. 240, 423 (2002).

J.J. Lim, T.M. Benson, E.C. Larkins and P. Sewell, "Wide-band finite difference time domain beam propagation method," Microwave and Optical Technology Letters, Vol. 33, 401 (2002).

T. Li, C.R. Staddon, S.V. Novikov, P.F. Fewster, A. Widdowson, N.L. Andrew, P. Kidd, I. Harrison, A.J. Winser, Y. Liao and C.T. Foxon, "X-ray studies of As-doped GaN grown by plasma-assisted molecular beam epitaxy,"

Publications for 2001

S. Marlafeka, N. Bock, T.S. Cheng, S.V. Novikov, A.J. Winser, I. Harrison, C.T. Foxon and P.D. Brown, "A structural study of phase transitions within GaN layers grown by low-temperature molecular beam epitaxy," Journal of Crystal Growth, Vol. 230, 415 (2001).

S.V. Novikov, A.J. Winser, I. Harrison, C.S. Davis and C.T. Foxon, "A study of the mechanisms responsible for blue emission from arsenic-doped gallium nitride," Semiconductor Science and Technology, Vol. 16, 103 (2001).

A.J. Winser, I. Harrison, S.V. Novikov, C.S. Davis, P.R. Campion, T.S. Cheng and C.T. Foxon, "Blue emission from arsenic doped gallium nitride," Journal of Crystal Growth, Vol. 230, 527 (2001).

B. Gil, A. Morel, T. Taliercio, P. Lefebvre, C.T. Foxon, I. Harrison, A.J. Winser and S.V. Novikov, "Carrier relaxation dynamics for As defects in GaN," Applied Physics Letters, Vol. 79, 69 (2001).

H.Z. Xu, A. Bell, Z.G. Wang, Y. Okada, M. Kawabe, I. Harrison and C.T. Foxon, "Competition between band gap and yellow luminescence in undoped GaN grown by MOVPE on sapphire substrate," Journal of Crystal Growth, Vol. 222, 96 (2001).

H.Z. Xu, K. Takahashi, W.X. Wang, Z.G. Wang, Y. Okada, M. Kawabe, I. Harrison and C.T. Foxon, "Effect of in-situ thermal treatment during growth on crystal quality of GaN epilayer grown on sapphire substrate by MOVPE," Journal of Crystal Growth, Vol. 222, 110 (2001).

F. Sweeney, C. Trager-Cowan, J. Hastie, D.A. Cowan, K.P. O'Donnell, D. Zubia, S.D. Hersee, C.T. Foxon, I. Harrison and S.V. Novikov, "Electron backscattered diffraction patterns from cooled gallium nitride thin films," Physica Status Solidi B: Basic Research, Vol. 228, 533 (2001).

J.W. Orton, I. Harrison and C.T. Foxon, "Gallium nitride EGW-4: 2000 - Proceedings of the fourth european workshop on gallium nitride," Journal of Crystal Growth, Vol. 230 (2001).

C.T. Foxon, S.V. Novikov, P.R. Campion, C.S. Davis, T.S. Cheng, A.J. Winser and I. Harrison, "Growth of GaNAs films by molecular beam epitaxy," Journal of Crystal Growth, Vol. 227, 486 (2001).

I. Harrison, N.W. Clayton and N.J. Jeffs, "High temperature RF characterisation of SiN passivated and unpassivated AlGaN/GaN HFETS," Physica Status Solidi A: Applied Research, Vol. 188, 275 (2001).

G.M. Laws, E.C. Larkins, I. Harrison, C. Molly and D. Somerford, "Improved refractive index formulas for the AlGaN alloys," Journal of Applied Physics, Vol. 89, 1108 (2001).

M.W. Fay, I. Harrison, J.C. Birbeck, B.T. Hughes, M.J. Uren, T. Martin and P.D. Brown, "Microstructural characterisation of TiAlTiAu and TiAlPdAu ohmic contacts on AlGaN/GaN," Institute of Physics Conference Series, Vol. 168, 497 (2001).

S. Sujecki, "New beam propagation algorithm for optical tapers," Journal of Electronics and Communications, Vol. 55, 185 (2001).

I. Harrison, S.V. Novikov, T. Li, R.P. Campion, C.R. Staddon, C.S. Davis, Y. Liao, A.J. Winser and C.T. Foxon, "On the origin of blue emission from As-doped GaN," Physica Status Solidi B: Basic Research, Vol. 228, 213 (2001).

S. Sujecki, J.G. Wykes, P. Sewell, T.M. Benson and E.C. Larkins, "Optical properties of tapered laser cavities," 3rd International Conference on Transparent Optical Networks, 55 (2001).

A. Bell, I. Harrison, D. Korakakis, E.C. Larkins, J.M. Hayes and M. Kuball, "Photoluminescence spectroscopy on annealed molecular beam epitaxy grown GaN," Journal of Applied Physics, Vol. 89, 1070 (2001).

A.J. Phillips, J.M. Senior, R. Mercinelli, M. Valvo, P.J. Vetter, C.M. Martin, M.O. van Deventer, P. Vaes and X.Z. Qiu, "Redundancy strategies for a high splitting optically amplified passive optical network," IEEE/OSA Journal of Lightwave Technology, Vol. 19, 137 (2001).

L. Borruel, I. Esquivias, S. Sujecki, J.G. Wykes, T.M. Benson, P. Sewell and E.C. Larkins, "Simulación bidimensional de diodos láser de alto brillo," Proceedings of the 2nd Spanish Meeting on Optoelectronics (OPTOEL), EMS25 (2001).

L. Borruel, I. Esquivias, S. Sujecki, J.G. Wykes, T.M. Benson, P. Sewell and E.C. Larkins, "Simulación cuasitridimensional de diodos láser de alto brillo," I Congresso Nacional de Sumulacion Cuasitridimensional de diodos laser de alto brillo (2001).

C. Mavroidis, J.J. Harris, K. Lee, I. Harrison, B.J. Ansell, Z. Bougrioua and I. Moerman, "Simultaneous impurity-band and interface conduction in depthprofiled n-GaN epilayers," Physica Status Solidi B: Basic Research, Vol. 228, 579 (2001).

A. Bell, F.A. Ponce, S.V. Novikov, C.T. Foxon and I. Harrison, "Spatially resolved cathodoluminescence study of As doped GaN," Physica Status Solidi B: Basic Research, Vol. 228, 207 (2001).

R. Xia, I. Harrison, B. Beaument, A.V. Andrianov, S.R.A. Dods, J.M. Morgan and E.C. Larkins, "Spectrally resolved electroluminescence microscopy and µ-elecroluminescence investigation of GaN-based LEDS," Journal of Crystal Growth, Vol. 230, 467 (2001).

Z.H. Mahmood and S. Sujecki, "Study on the field profiles of rib waveguides fabricated on GaAs-AlGaAs material," 11th International Workshop on the Physics of Semiconductor Devices, Vol. 1, 223 (2001).

G. Moldovan, S. Marlafeka, I. Harrison and P.D. Brown, "Surface preparation procedures for contacting GaN," Institute of Physics Conference Series, Vol. 168, 357 (2001).

M.W. Fay, I. Harrison, J.C. Birbeck, B.T. Hughes, M.J. Uren, T. Martin and P.D. Brown, "TEM assessment of GaN/AlGaN/TiAlTiAu ohmic contacts," Institute of Physics Conference Series, Vol. 168, 345 (2001).

S.V. Novikov, T. Li, A.J. Winser, R.P. Campion, C.R. Staddon, C.S. Davis, I. Harrison and C.T. Foxon, "Temperature dependence of the miscibility gap on the GaN-rich side of the Ga-N-As system," Physica Status Solidi B: Basic Research, Vol. 228, 223 (2001).

B.J. Ansell, I. Harrison and C.T. Foxon, "The effect of surface passivation and illumination on the device properties of AlGaN/GaN HFETS," Physica Status Solidi A: Applied Research, Vol. 188, 279 (2001).

R.P. Campion, T. Li, C.T. Foxon and I. Harrison, "The growth of GaN using plasma assisted metalorganic vapour phase epitaxy," Physica Status Solidi A: Applied Research, Vol. 188, 663 (2001).

C.T. Foxon, S.V. Novikov, R.P. Campion, Y. Liao, A.J. Winser and I. Harrison, "The influence of As on the optimum nitrogen to gallium ratio required to grow high quality GaN films by molecular beam epitaxy," Physica Status Solidi B: Basic Research, Vol. 228, 219 (2001).

S.V. Novikov, T. Li, A.J. Winser, C.T. Foxon, R.P. Campion, C.R. Staddon, C.S. Davis, I. Harrison, A.P. Kovarsky and B.J. Ber, "The influence of arsenic incorporation on the optical properties of As-doped GaN films grown by molecular beam epitaxy using arsenic tetramers," Physica Status Solidi B: Basic Research, Vol. 228, 227 (2001).

A. Bell, F.A. Ponce, S.V. Novikov, C.T. Foxon and I. Harrison, "The nature of arsenic incorporation in GaN," Applied Physics Letters, Vol. 79, 3239 (2001).

C.T. Foxon, S.V. Novikov, Y. Liao, A.J. Winser, I. Harrison, T. Li, R.P. Campion, C.R. Staddon and C.S. Davis, "The transition from blue emission in As-doped GaN to GaNAs alloys in layers grown by molecular beam epitaxy," Physica Status Solidi B: Basic Research, Vol. 228, 203 (2001).

Publications for 2000

M.R. Handley, M.S. Leeson, J.M. Senior, A.J. Phillips, P. Ball and I. Wright, "A protocol for broadband access over PONs," IEE Seminar on New Access Network Technologies, Vol. 7, 1 (2000).

A. Bell, I. Harrison, D. Korakakis, E.C. Larkins, J.M. Hayes and M. Kuball, "A study of annealed Gan grown by molecular beam epitaxy using photoluminescence spectroscopy," MRS Internet Journal of Nitride Semiconductor Research, Vol. 5, 51 (2000).

A. Bell, I. Harrison, T.S. Cheng, D. Korakakis, C.T. Foxon, S.V. Novikov, B.Y. Ber and Y.A. Kudriavtsev, "An investigation into the origin of the 3.424 eV peak in the low-temperature photoluminescence of GaN grown by molecular beam epitaxy," Semiconductor Science and Technology, Vol. 15, 789 (2000).

S. Sujecki, "Analiza wlasciwosci propagacyjnych stozkowych struktur swiatlowodowych (Characteristics of optical tapers)," KST 2000 National Conference on Communications, 385 (2000).

C.T. Foxon, S.V. Novikov, T.S. Cheng, C.S. Davis, R.P. Campion, A.J. Winser and I. Harrison, "Arsenic-doped Gan grown by molecular beam epitaxy," Journal of Crystal Growth, Vol. 219, 327 (2000).

S. Sujecki, T.M. Benson, P. Sewell, P.C. Kendall and A. Majewski, "Beam propagation analysis of nonlinear tapers," Proceedings of the International Conference on Transparent Optical Networks, 37 (2000).

S. Sujecki, "Beam propagation in non-linear tapered co-ordinate system," Boundary Scientific Proceedings of Riga Technical University: Field Problems and Computer Simulation, 5 (2000).

M.C. D'Arrigo, T.E. Cross, C. Leonelli, G.C. Pellacani and C. Siligardi, "Bulk crystallisation of glasses belonging to Ca-ZrO₂-SiO₂ system by microwave energy," Journal of the American Ceramic Society, Vol. 83, 1001 (2000).

J. Arias, I. Esquivias, E.C. Larkins, S. Burkner, S. Weisser and J. Rosenzweig, "Determination of the band offset and the characteristic interdiffusion length in quantum-well lasers using a capacitance-voltage technique," Applied Physics Letters, Vol. 77, 776 (2000).

I. Harrison, "Diffusion of impurities," in Properties of Indium Phosphide 2nd Edition INSPEC IEE, London, 251 (2000).

B.J. Ansell, I. Harrison, C.T. Foxon, J.J. Harris and T.S. Cheng, "Direct evidence for defect conduction at interface between gallium nitride and sapphire," Electronics Letters, Vol. 36, 1237 (2000).

M.R. Handley, M.S. Leeson, J.M. Senior, A.J. Phillips, P. Ball and I. Wright, "Dynamic assignment in wavelength division multiplexed passive optical networks," Proceedings of NOC 2002, Vol. 2, 126 (2000).

H.Z. Xu, Z.G. Wang, M. Kawabe, I. Harrison, B.J. Ansell and C.T. Foxon, "Fabrication and characterization of metal-semiconductor-metal (MSM) ultraviolet photodetectors on undoped GaN/Sapphire grown by MBE," Journal of Crystal Growth, Vol. 218, 1 (2000).

J.M. Senior, M.R. Handley, M.S. Leeson, A.J. Phillips and J. Ainscough, "New wavelength assignment schemes for wavelength division multiplexed passive optical networks," Proceedings SPIE, Vol. 4213, 73 (2000).

A.V. Andrianov, S.R.A. Dods, J. Morgan, J.W. Orton, T.M. Benson, I. Harrison, E.C. Larkins, F.X. Daiminger, E. Vassilakis and J.P. Hirtz, "Optical and photoelectric study of mirror facets in degraded high power AlGaAs 808 nm laser diodes," Journal of Applied Physics, Vol. 87, 3227 (2000).

S. Sujecki, "Optimised tapered beam propagation," Optoelectronics Review, Vol. 8, 269 (2000).

H.Z. Xu, Z.G. Wang, I. Harrison, A. Bell, B.J. Ansell, A.J. Winser, T.S. Cheng, C.T. Foxon and M. Kawabe, "Photoluminescence and optical quenching of photoconductivity studies on undoped GaN grown by molecular beam epitaxy," Journal of Crystal Growth, Vol. 217, 228 (2000).

J. Chiene, A.J. Phillips and J.M. Senior, "Resilience issues for WDM optical access networks," Proceedings of NOC 2002, Vol. 1, 130 (2000).

A.J. Winser, S.V. Novikov, C.S. Davis, T.S. Cheng, C.T. Foxon and I. Harrison, "Strong blue emission from As-doped GaN grown by molecular beam epitaxy," Applied Physics Letters, Vol. 77, 2506 (2000).

S. Sujecki, T.M. Benson, P. Sewell and P.C. Kendall, "Tapered rib waveguides: Fast and accurate FD-BPM," Optica Applicata, 177 (2000).

J.J. Harris, K.J. Lee, J.B. Webb, H. Tang, I. Harrison, L.B. Flannery, T.S. Cheng and C.T. Foxon, "The implications of spontaneous polarization effects for carrier transport measurements in GaN," Semiconductor Science and Technology, Vol. 15, 413 (2000).

M.R. Handley, M.S. Leeson, J.M. Senior, A.J. Phillips, P. Ball and I. Wright, "The staggered filter architecture: A WDM PON with dynamic wavelength assignment," Proceedings of ECOC 2000, Vol. 3, 24 (2000).

S. Sujecki, "Two asymmetrical optical rib waveguides," Proceedings SPIE, Vol. 4239, 235 (2000).

Publications for 1999

M.R. Handley, M.S. Leeson, J.M. Senior, A.J. Phillips, P. Ball and I. Wright, "A comparison of WDM PON architectures," Proceedings of NOC '99, 141 (1999).

S.Sujecki, "Analiza wlasciwosci propagacyjnych swiatlowodów optyki zintegrowanej (Numerical analysis of integrated optical waveguides)," KST’99, Bydgoszcz, Poland, 385 (1999).

B. Romero, I. Esquivias, S. Weisser, E.C. Larkins and J. Rosenzweig, "Carrier capture and escape processes in In_0.25Ga_0.75As-GaAs quantum-well lasers," IEEE Photonics Technology Letters, Vol. 11, 779 (1999).

S. Sujecki, T.M. Benson, P. Sewell and P.C. Kendall, "Efficient 3D-BPM method for semiconductor integrated optics," Proceedings of the International Conference on Transparent Optical Networks, 63 (1999).

A.V. Blant, T.S. Cheng, N.J. Jeffs, L.B. Flannery, I. Harrison, J.F.W. Mosselmans, A.D. Smith and C.T. Foxon, "EXAFS studies of Mg doped InN grown on A1₂O₃," Materials Science and Engineering, Vol. B59, 218 (1999).

T.M. Benson, P. Sewell, P.C. Kendall and S. Sujecki, "Finite difference methods in optoelectronic simulation," Proceedings of the International Conference on Transparent Optical Networks, 47 (1999).

A.V. Blant, S.V. Novikov, T.S. Cheng, L.B. Flannery, I. Harrison, R.P. Campion, E.C. Larkins, Y. Kribes and C.T. Foxon, "Ga-Metal inclusions in GaN grown on sapphire," Journal of Crystal Growth, Vol. 203, 349 (1999).

J.M. Hayes, M. Kuball, A. Bell, I. Harrison, D. Korakakis and C.T. Foxon, "High-temperature processing of GaN: The influence of the annealing ambient on strain in GaN," Applied Physics Letters, Vol. 75, 2097 (1999).

J.J. Harris, K.J. Lee, I. Harrison, L.B. Flannery, D. Korakakis, T.S. Cheng, C.T. Foxon, Z. Bougrioua, I. Moerman, W. van der Stricht, E.J. Thrush, B. Hamilton and K. Ferhah, "Interpretation of the temperature-dependent transport properties of GaN/sapphire films grown by MBE and MOCVD," Physica Status Solidi A: Applied Research, Vol. 176, 363 (1999).

J.M. Senior, M.R. Handley, M.S. Leeson, A.J. Phillips, P. Ball and I. Wright, "Modelling of the response of different WDM PON architectures to varying traffic load," Proceedings SPIE, Vol. 3843, 181 (1999).

M. Kuball, F.H. Morrissey, M. Benyoucef, I. Harrison, D. Korakakis and C.T. Foxon, "Nano-fabrication of GaN pillars using focused ion beam etching," Physica Status Solidi A: Applied Research, Vol. 176, 355 (1999).

S. Sujecki, P. Sewell, T.M. Benson and P.C. Kendall, "Novel Beam propagation algorithms for tapered optical structures," Journal of Lightwave Technology, Vol. 17, 2379 (1999).

S. Sujecki and Z.H. Mahmood, "Rib loaded optical waveguide on GaAs substrate," KST 1999 pp.379 (1999).

T.M. Benson, P. Sewell, S. Sujecki and P.C. Kendall, "Structure related beam propagation," Optical and Quantum Electronics, Vol. 31, 689 (1999).

N.I. Katsavets, G.M. Laws, I. Harrison, E.C. Larkins, T.M. Benson, T.S. Cheng and C.T. Foxon, "Study of GaN thin layers subjected to high-temperature rapid thermal annealing," Semiconductors, Vol. 33, 222 (1999).

P. Sewell, T.M. Benson, S. Sujecki and P.C. Kendall, "The dispersion characteristics of oblique coordinate beam propagation algorithms," Journal of Lightwave Technology, Vol. 17, 514 (1999).

M. Kuball, J.M. Hayes, A. Bell, I. Harrison, D. Korakakis and C.T. Foxon, "The influence of the annealing ambient on strain and doping in GaN during high-temperature processing," Physica Status Solidi A: Applied Research, Vol. 176, 759 (1999).

S. Sujecki, "Uklad dwóch niesymetrycznych swiatlowodów zebrowych (Unsymmetric rib optical couplers)," Konferencja Swiatlowdy i ich zastosowania, Krasnobrod 1999 (Conference on the applications of the optical waveguides) (1999).

Publications for 1998

E.C. Larkins, S.R.A. Dods, A.V. Andrianov, J. Morgan, I. Harrison, T.M. Benson and J.W. Orton, "A highly integrated system for a fast, flexible and comprehensive characterisation of semiconductor lasers," Technical Digest of CLEO-Europe 1998, 98 (1998).

P. Sewell, S. Sujecki, T.M. Benson and P.C. Kendall, "A novel beam propagation algorithm for three dimensional tapers," Integrated Photonics Research 1998, Vol. 4, 14 (1998).

J. Arias, I. Esquivias, S. Buerkner, P. Chazan, J.D. Ralston, E.C. Larkins, M. Mikulla, S. Weisser and J. Rosenzweig, "Characterization and modelling of InGaAs/GaAs multiple quantum well lasers by capacitance-voltage measurements," Proceedings SPIE, Vol. 2994, 534 (1998).

M.R. Handley, M.S. Leeson, A.J. Phillips, J.M. Senior, P. Ball and I. Wright, "Comparison and simulation of wavelength allocation algorithms on passive optical networks," Proceedings of IEE Colloquium on Multiwavelength Optical Networks: Devices, Systems and Network Implementations, Vol. 2, 8/1-6 (1998).

N. Baba-Ali, I. Harrison and B. Tuck, "Does sulphur induce disordering in GaAs-AlAs superlattices?," IOP Solid State Conference 1998, Nottingham, UK (1998).

E. Calleja, M.A. Sanchez-Garcia, D. Basak, F.J. Sanchez, F. Calle, P. Youinou, E. Munoz, J.J. Serrano, J.M. Blanco, C. Villar, T. Laine, J. Oila, K. Saarinen, P. Hautojarvi, C.H. Molloy, D.J. Somerford and I. Harrison, "Effect of Ga/Si interdiffusion on optical and transport properties of GaN layers grown on Si(111) by molecular beam epitaxy," Physical Review B, Vol. 58, 1550 (1998).

G.M. Laws, J. Morgan, G.B. Ren, I. Harrison, E.C. Larkins, J.W. Orton, S.E. Hooper, T.S. Cheng and C.T. Foxon, "Electrical and optical characterisation of homojunction gallium nitride light emitting diodes," Nitride Semiconductors, Vol. 482, 1113 (1998).

Y. Kribes, I. Harrison, B. Tuck, T.S. Cheng and C.T. Foxon, "Electrical properties of n-GaN/n⁺-GaAs interfaces," Journal of Crystal Growth, Vol. 190, 773 (1998).

L.B. Flannery, I. Harrison, D.E. Lacklison, R.I. Dykeman, T.S. Cheng and C.T. Foxon, "Fabrication and characterisation of p-type GaN metal-semiconductor-metal ultraviolet photoconductors grown by MBE," Materials Science and Engineering, Vol. B50, 307 (1998).

V.V. Belkov, V.M. Botnaryuk, L.M. Fedorov, I.N. Goncharuk, S.V. Novikov, V.P. Ulin, Y.V. Zhilyaev, T.S. Cheng, N.J. Jeffs, C.T. Foxon, N.I. Katsavets and I. Harrison, "Hydride vapour phase epitaxy of GaN on molecular beam epitaxial GaN substrates," Journal of Crystal Growth, Vol. 187, 29 (1998).

M. Keche, M.S. Woolfson, I. Harrison and A. Ouamri, "Improved multiple targets angle tracking algorithm using the joint probabilistic data association filter," IEE Proceedings - Radar Sonar and Navigation, Vol. 145, 331 (1998).

H.P. Ho, I. Harrison and B. Tuck, "Impurity induced disordering in AlAs-GaAs multiquantum well structures by Zn Diffusion," IOP Solid State Conference 1998, Nottingham, UK (1998).

K.C. Heasman, I. Harrison, K.P. Homewood and B.J. Sealy, "Impurity induced disordering of Al_xGa_1-xAs/GaAs MQW structures," IOP Solid State Conference 1998, Nottingham, UK (1998).

T.S. Cheng, C.T. Foxon, N.J. Jeffs, D.J. Dewsnip, L.B. Flannery, J.W. Orton, I. Harrison, S.V. Novikov, B.Y. Ber and Y.A. Kudriavtsev, "Magnesium-doped GaN films grown by molecular beam epitaxy on GaAs(111)B substrates," Materials Science Forum, Vol. 264, 1217 (1998).

D.J. Dewsnip, J.W. Orton, D.E. Lacklison, L.B. Flannery, A.V. Andrianov, I. Harrison, S.E. Hooper, T.S. Cheng, C.T. Foxon, S.V. Novikov, B.Y. Ber and Y.A. Kudriavtsev, "MBE growth and characterization of magnesium-doped gallium nitride," Semiconductor Science and Technology, Vol. 13, 927 (1998).

J.M. Senior, A.J. Phillips, P.J. Vetter, C.M. Martin and M.O. van Deventer, "Network resilience for a SuperPON," Proceedings SPIE, Vol. 3531, 432 (1998).

S. Sujecki, P. Sewell, T.M. Benson and P.C. Kendall, "Novel vectorial analysis of optical waveguides," IEEE Journal of Lightwave Technology, Vol. 16, 1329 (1998).

D.J. Dewsnip, A.V. Andrianov, I. Harrison, J.W. Orton, D.E. Lacklison, G.B. Ren, S.E. Hooper, T.S. Cheng and C.T. Foxon, "Photoluminescence of MBE grown wurtzite Be-doped GaN," Semiconductor Science and Technology, Vol. 13, 500 (1998).

A. Majewski and S. Sujecki, "Polarization characteristics of optical rib waveguides," Optica Applicata, 76 (1998).

A.J. Phillips, J.M. Senior, P.J. Vetter, M.O. van Deventer, M. Valvo and R. Mercinelli, "Redundancy strategies for a SuperPON," Proceedings of NOC '98, Vol. 1, 73 (1998).

A.J. Phillips, J.M. Senior, P.J. Vetter, M.O. van Deventer, M. Valvo and R. Mercinelli, "Reliability of SuperPON systems," Proceedings of the 6th IEE Conference on Telecommunications, 219 (1998).

M.O. van Deventer, R. Mercinelli, A.J. Phillips, J.M. Senior, M. Valvo M and P.J. Vetter, "Reliability of SuperPON systems," CSELT - Technical Reports, Vol. 25, 819 (1998).

A. Vukovic, S. Sujecki, P. Sewell, T.M. Benson and P.C. Kendall, "Singularity corrected spectral index method," IEE Proceedings - Optoelectronics, Vol. 145, 59 (1998).

T.M. Benson, P. Sewell, S. Sujecki and P.C. Kendall, "Structure dependent beam propagation," Workshop: Numerical Methods in Optoelectronics (1998).

C.T. Foxon, T.S. Cheng, N.J. Jeffs, D.J. Dewsnip, L.B. Flannery, J.W. Orton, I. Harrison, S.V. Novikov, B.Y. Ber and Y.A. Kudriavtsev, "Studies of p-GaN grown by MBE on GaAs(111)B," Journal of Crystal Growth, Vol. 190, 516 (1998).

J.G.P. Binner, J.A. Fernie, P.A. Whittaker and T.E. Cross, "The effect of composition on the microwave bonding of alumina ceramics," Journal of Materials Science, Vol. 33, 3017 (1998).

J.G.P. Binner, J.A. Fernie, P.A. Whittaker and T.E. Cross, "The effect of composition on the microwave bonding of alumina ceramics," Journal of Materials Science, Vol. 33, 3031 (1998).

Publications for 1997

A.J. Phillips, R.A. Cryan and J.M. Senior, "A self-synchronised optically preamplified digital PPM receiver for optical fibre communications employing an improved suboptimum filtering scheme," International Journal of Optoelectronics, Vol. 11, 309 (1997).

J.G.P. Binner, T.E. Cross and N.R. Greenacre, "A study of the microwave loss mechanisms in zirconia," First Work Congress on Microwave Processing (1997).

A.J. Phillips, R.A. Cryan and J.M. Senior, "An optically preamplified digital PPM receiver with improved suboptimum filtering," Microwave and Optical Technology Letters, Vol. 14, 23 (1997).

S.S. Ahmeda, M. Keche, I. Harrison and M.S. Woolfson, "Adaptive joint probabilistic data association algorithm for tracking multiple targets in cluttered environment," IEE proceedings - Radar, Sonar and Navigation, Vol. 144, 309 (1997).

M. Keche, I. Harrison, M.S. Woolfson and A. Ouamri, "Adaptive update time target tracking using recursive input estimation," Proceedings of RADAR 97 Conference, Vol. 449, 620 (1997).

A. Vukovic, S. Sujecki, C.J. Smartt, P. Sewell, T.M. Benson and P.C. Kendall, "Analysis of large rib waveguides in silicon-on-insulator materials," Telesiks 1997, 464 (1997).

J. Arias, I. Esquivias, S. Burkner, P. Chazan, J.D. Ralston, E.C. Larkins, M. Mikulla, S. Weisser and J. Rosenzweig, "Characterisation and modeling of InGaAs/GaAs multi-quantum well lasers by capacitance-voltage measurements," Proceedings SPIE, Vol. 2994, 534 (1997).

A. Majewski and S. Sujecki, "Duzy jednomodowy swiatlowód zebrowy (Large single-mode optical rib waveguides)," KST 1997, pp.383 (1997).

Y. Kribes, I. Harrison, B. Tuck, T.S. Cheng and C.T. Foxon, "Electrical characterisation of GaN/GaAs interfaces," 2nd International Conference on III-V Nitrides (1997).

B. Tuck and I. Harrison, "Electrical characterisation of GaN/GaAs surfaces," 2nd International Conference on III-V Nitrides (1997).

G.M. Laws, J. Morgan, G.B. Ren, I. Harrison, E.C. Larkins, J.W. Orton, S.E. Hooper and C.T. Foxon, "Electrical and optical characterisation of homojunction gallium nitride emitting diodes," Materials Research Society Symposium Proceedings (1997).

M.O. van Deventer, Y.M. van Dam, P.J.M. Peters, F. Vermaerke and A.J. Phillips, "Evolution phases to an ultra-broadband access network: Results from ACTS-PLANET," IEEE Communications Magazine, Vol. 35, 72 (1997).

S. Sujecki, P. Sewell, P.C. Kendall, T.M. Benson and A. Majewski, "Finite difference analysis of optical waveguides using new efficient matrix eigenvalue solver.," Riga 1997, Vol. 40, 12 (1997).

J.G.P. Binner, T.E. Cross and N.R. Greenacre, "High temperature microwave loss mechanisms in zirconia," 2nd European Workshop in Microwave Processing of Materials (1997).

M. Keche, M.S. Woolfson, I. Harrison, A. Ouamri and S.S. Ahmeda, "Improved adaptive joint probabilistic data association filter for multiple targets angles tracking," Electronics Letters, Vol. 33, 1361 (1997).

Y. Kribes, I. Harrison, B. Tuck, K.S. Kim, T.S. Cheng and C.T. Foxon, "Investigation of aluminium ohmic contacts to n-type GaN grown by molecular beam epitaxy," Semiconductor Science and Technology, Vol. 12, 1500 (1997).

Y. Kribes, I. Harrison, B. Tuck, T.S. Cheng and C.T. Foxon, "Investigation of Au schottky contacts on GaN grown by molecular beam epitaxy," Semiconductor Science and Technology, Vol. 12, 913 (1997).

M.S. Torre, I. Esquivias, B. Romero, K. Czotscher, S. Weisser, J.D. Ralston, E.C. Larkins, W. Benz and J. Rosenzweig, "Lateral carrier profile for mesa-structured InGaAs/GaAs lasers," Journal of Applied Physics, Vol. 81, 6268 (1997).

J. Morgan, I. Harrison, S.R.A. Dods, A.V. Andrianov, J.W. Orton, E.C. Larkins, H. Asonen, J. Nappi, I. Esquivias and J. Arias, "Low frequency electrical noise characteristics of broad area 808 nm semiconductor laser diodes," IEEE LEOS 1997 Annual Meeting Proceedings, Vol. 2, 74 (1997).

J. Morgan, I. Harrison, S.R.A. Dods, A.V. Andrianov, J.W. Orton, E.C. Larkins, J. Nagle, H. Asonen, J. Nappi, I. Esquivias and J. Arias, "Low frequency electrical noise characteristics of broad area 808 nm semiconductor laser diodes," European Semiconductor Laser Workshop, Scotland, UK. (1997).

J.G.P. Binner, T.E. Cross and Y. Yin, "Microwave assisted chemical vapour infiltration for ceramic matrix composites," First Work Congress on Microwave Processing (1997).

S. Sujecki, A. Majewski, C. Kostrzewa and K. Petermann, "Mode characteristics of SOI rib waveguide structures," MIOP 1997 (1997).

I. Van de Voorde, M.O. van Deventer, P.J.M. Peters, P. Crahay, E. Jaunart, A.J. Phillips, J.M. Senior, X.Z. Qiu, J. Vandewege and P.J. Vetter, "Network topologies for SuperPON," Technical Digest of Optical Fiber Communications (OFC) 1997, Vol. TuK6, 57 (1997).

D.J. Dewsnip, A.V. Andrianov, I. Harrison, D.E. Lacklison, J.W. Orton, J. Morgan, G.B. Ren, T.S. Cheng, S.E. Hooper and C.T. Foxon, "Observation of resonant raman lines during the photoluminescence of doped GaN," Semiconductor Science and Technology, Vol. 12, 55 (1997).

M. Keche, A. Ouamri, I. Harrison and M.S. Woolfson, "Performance evaluation of an algorithm for multiple target angle tracking," IEE proceedings - Radar, Sonar and Navigation, Vol. 144, 252 (1997).

A.V. Andrianov, S.R.A. Dods, J. Morgan, J.W. Orton, I. Harrison, E.C. Larkins, F.X. Daiminger, E. Vassilakis and J.P. Hirtz, "Photoluminescence microscopy of mirror facets of board area laser diodes," IEEE LEOS 1997 Annual Meeting Proceedings, Vol. 2, 68 (1997).

J.M. Senior, A.J. Phillips and M.O. van Deventer, "Physical layer dimensioning of SuperPON architectures," Proceedings SPIE, Vol. 3230, 198 (1997).

A.J. Phillips, J.M. Senior and M.S. Leeson, "Power budget dimensioning of SOA based SuperPON architectures," Proceedings of the Fourth Manchester Communication Networks Symposium, 112 (1997).

A. Majewski and S. Sujecki, "Rib lightguides and couplers," Bulletin of the Polish Academy of Sciences - Technical Sciences, Vol. 45, 145 (1997).

S.V. Novikov, T.S. Cheng, Z. Mahmood, I. Harrison and C.T. Foxon, "Selective meltback etching of GaN layers in liquid-phase electroepitaxial technique," Journal of Crystal Growth, Vol. 172, 1 (1997).

S. Sujecki, P. Sewell, P.C. Kendall, T.M. Benson and A. Majewski, "Simple approach to solving vectorial finite difference equations," SIOE 1997 (1997).

M.R. Handley, M.S. Leeson, J.M. Senior, A.J. Phillips, P. Ball and I. Wright, "Simulation of protocols for WDM on PONs," Proceedings of the Fourth Manchester Communication Networks Symposium, 249 (1997).

A.J. Phillips, J.M. Senior, M.O. van Deventer, P.J.M. Peters and I. Van de Voorde, "SuperPON: A broadband access solution from ACTS-PLANET," IEE 14th UK Teletraffic Symposium, 21/1 (1997).

T.E. Cross, "The application of high temperature microwave dielectric property measurements to the microwave processing of engineering ceramics," The 1st Conference on Materials Science (1997).

S.S. Ahmeda, I. Harrison and M.S. Woolfson, "Tracking multiple targets with a phased array radar," Proceedings of RADAR 97 Conference, Vol. 449, 601 (1997).

K. Czotscher, E.C. Larkins, S. Weisser, W. Benz, J. Daleiden, J. Fleissner, M. Maier, J.D. Ralston and J. Rosenzweig, "Uncooled high-temperature (130°C) operation of InGaAs/GaAs multiple quantum well lasers at 20 Gbit/s," IEEE Photonics Technology Letters, Vol. 9, 575 (1997).

A. Majewski and S. Sujecki, "Zebrowe sprzegacze kierunkowe (Rib directional couplers)," KST 1997, 391 (1997).

Publications for 1996

R.A. Cryan, A.J. Phillips and J.M. Senior, "A moment generating function formulation for an optically preamplified PPM intersatellite system," Journal of Optical Communications, Vol. 17, 68 (1996).

M. Keche, A. Ouamri, I. Harrison, M.S. Woolfson and M. Ouldmammer, "An efficient algorithm for the data association problem solving in multiple targets angle tracking," Proceedings of the IAESTED International Conference on Signal and Image Processing and Applications, 114 (1996).

A.J. Phillips, R.A. Cryan and J.M. Senior, "An optically preamplified intersatellite PPM receiver employing maximum likelihood detection," IEEE Photonics Technology Letters, Vol. 8, 691 (1996).

S.S. Ahmeda, I. Harrison and M.S. Woolfson, "Adaptive probabilistic data-association algorithm for tracking in cluttered environment," IEE proceedings - Radar Sonar Navigation, Vol. 143, 17 (1996).

J.D. Ralston, E.C. Larkins, K. Eisele, S. Weisser, S. Burkner, A. Schonfelder, J. Daleiden, K. Czotscher, I. Esquivias, J. Fleissner, R.E. Sah, M. Maier, W. Benz and J. Rosenzweig, "Advanced epitaxial-growth and device processing techniques for ultra-high-speed (> 40 GHz) directly-modulated semiconductor-lasers," Proceedings SPIE, Vol. 2683, 30 (1996).

A. Majewski and S. Sujecki, "Analiza wlasciwosci propagacyjnych swiatlowodów prostokatnych (Modal characteristics of rectangular optical waveguides)," Prace Naukowe Politechniki Warszawskiej, Vol. 100, 5 (1996).

M.O. van Deventer, J.D. Angelopoulos, J.J.M. Binsma, A.J. Boot, P. Crahay, E. Jaunart, P.J.M. Peters, A.J. Phillips, X.Z. Qiu, J.M. Senior, M. Valvo, J. Vandewege, P. Vetter and I. Van de Voorde, "Architectures for 100 km 2048 split bidirectional SuperPONs from ACTS-PLANET," Proceedings SPIE, Vol. 2919, 242 (1996).

H. Schneider, P. Koidl, C. Schonbein, S. Ehret, E.C. Larkins and G. Bihlmann, "Capture dynamics and far-infrared response in photovoltaic quantum well intersubband photodetectors," Superlattices and Microstructures, Vol. 19, 347 (1996).

I. Esquivias, B. Romero, S. Weisser, K. Czotscher, J.D. Ralston, E.C. Larkins, J. Arias, A. Schonfelder, M. Mikulla, J. Fleissner and J. Rosenzweig, "Carrier escape time in Gaas/AlGaAs and InGaAs/GaAs quantum-well lasers," Proceedings SPIE, Vol. 2684, 17 (1996).

J. Arias, J.D. Ralston, I. Esquivias, E.C. Larkins, S. Weisser, J. Rosenzweig, A. Schonfelder and M. Maier, "Carrier profile for In_0.35Ga_0.65As/GaAs multi-quantum well lasers from capacitance-voltage measurements," Applied Physics Letters, Vol. 68, 1138 (1996).

S. Sujecki, A. Majewski, C. Kostrzewa and K. Petermann, "Characteristics of planar directional couplers based on rib-waveguide structure," Mathematical Methods in Electromagnetic Theory 1996 (1996).

M. Arai, J.G.P. Binner and T.E. Cross, "Comparison of techniques for measuring high-temperature microwave complex permittivity: Measurements on an Alumina/Zircona system," Journal of Microwave Power and Electromagnetic Energy, Vol. 31, 12 (1996).

S. Weisser, E.C. Larkins, K. Czotscher, W. Benz, J. Daleiden, I. Esquivias, J. Fleissner, J.D. Ralston, B. Romero, R.E. Sah, A. Schonfelder and J. Rosenzweig, "Damping-limited modulation bandwidths up to 40 GHz in undoped short-cavity In_0.35Ga_0.65As/GaAs multiple-quantum-well lasers," IEEE Photonics Technology Letters, Vol. 8, 608 (1996).

I. Harrison, "Diffusion of impurities," in Properties of GaAs 3rd Edition INSPEC IEE, London, 429 (1996).

H. Schneider and E.C. Larkins, "Electron capture in AlGaAs/AlAs/GaAs double-barrier quantum well structures: Tunneling versus intervalley scattering," Solid-State Electronics, Vol. 40, 133 (1996).

M.P. Craven, T.E. Cross and J.G.P. Binner, "Enhanced computer modelling for high temperature microwave processing of ceramic materials," Microwave Processing of Materials V, Material Research Society Symposium Proceedings, Vol. 430, 351 (1996).

J.G.P. Binner, M.P Craven and T.E. Cross, "Enhanced computer modelling for high temperature microwave processing of ceramic materials," Proceedings of the MRS Spring Meeting (1996).

I. Van de Voorde, C. Martin, Q. Xing-Zhi, J. Vandewege, E. Jaunart, A.J. Phillips and A.J. Boot, "Evaluation of network topologies for SuperPON access networks," Proceedings of the NOC '96 (1996).

R.E. Sah, J.D. Ralston, J. Daleiden, E.C. Larkins, S. Weisser, J. Fleissner and W. Benz, "Fabrication of dry-etched mirrors in GaAs-based and InP-based lasers using chemically assisted ion-beam etching at low temperatures," Journal of Electronic Materials, Vol. 25, 144 (1996).6

A. Majewski and S. Sujecki, "Finite difference analysis of SOI rib lightguides and couplers: Boundary field problems and computers," Riga 1996, 21 (1996).

M. Mikulla, W. Benz, P. Chazan, J. Daleiden, J. Fleissner, G. Kaufel, E.C. Larkins, M. Maier, J.D. Larson, J. Rosenzweig and A. Wetzel, "High power tapered InGaAs/GaAs laser diodes with carbon doped cladding layers grown," Institute of Physics Conference Series, Vol. 145, 995 (1996).

S. Burkner, M. Baeumler, J. Wagner, E.C. Larkins, W. Rothemund and J.D. Ralston, "Influences of interdiffusion processes on optical and structural properties of pseudomorphic In_0.35Ga_0.65As/GaAs multiple-quantum-well structures," Journal of Applied Physics, Vol. 79, 6818 (1996).

A. Majewski and S. Sujecki, "Krzemowy swiatlowod zebrowy (Modal characterisctics of rib optical waveguides)," KST 1996, 234 (1996).

A. Majewski and S. Sujecki, "Modes in rectangular fibres," Optoelectronics Review, 46 (1996).

A. Schonfelder, K. Czotscher, E.C. Larkins, S. Weisser, J.D. Ralston and J. Rosenzweig, "Optical gain and spontaneous emission in InGaAs/GaAs MQW laser diodes," Journal of Applied Physics, Vol. 80, 582 (1996).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Optically preamplified pulse-position modulation for fibre-optic communication systems," IEE Proceedings - Optoelectronics, Vol. 142, 153 (1996).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Performance analysis of an optically preamplified intersatellite PPM receiver," Proceedings of the Third Manchester Communication Networks Symposium, 39 (1996).

S. Ehret, H. Schneider and E.C. Larkins, "Photocurrent anomaly in double-barrier quantum well structures," Proceedings SPIE, Vol. 2694, 117 (1996).

I.A.H. Al-Dawery, J.G.P. Binner and T.E. Cross, "Processing and characterization of microwave and conventionally sintered bulk YBCO high-T-C superconductors," Materials Research Society Symposium Proceedings, Vol. 430, 169 (1996).

A. Majewski and S. Sujecki, "Rectangular lightguide: Boundary field problem," Riga 1996, 29 (1996).

J. Vandewege, X.Z. Qiu, J. Zhou, C. Coene, B. Staelens, C. Martin, J.J.M. Binsma, L.F. Tiemeijer, A.J. Phillips, A.J. Boot, E. Jaunart, P. Crahay and I. Van de Voorde, "Semiconductor optical amplifier cascade for advanced optical access networks," Fourth Symposium on Communications and Vehicular Technology, IEEE CVT Benelux Chapter (1996).

M. Mikula, P. Chazan, B. Raynor, J. Daleiden, E.C. Larkins, A. Schmit and G. Trankle, "Single growth step InGaAs DBR laser diodes with first order CAIBE-etched gratings," Technical Digest of CLEO '96 (1996).

K. Czotscher, S. Weisser, E.C. Larkins, J. Fleissner, J.D Ralston, A. Schonfelder and J. Rosenzweig, "Structural and carrier density dependence of carrier lifetime in InGaAs/GaAs multiple-quantum-well lasers," Applied Physics Letters, Vol. 69, 3158 (1996).

A. Majewski and S. Sujecki, "Superpozycja modów najnizszego rzedu w swiatlowodzie zebrowym (Superposition of lower order modes in rib waveguides)," KST 1996, 244 (1996).

A. Majewski and S. Sujecki, "Swiatlowód Zebrowy (Optical rib waveguides)," Swiatlowody i ich zastosowania. Lublin '96 (Conference on the applications of the optical waveguides) (1996).

A. Majewski and S. Sujecki, "The analysis of the rib waveguide characteristics by semivectorial finite difference method," Wroclaw URSI 1996, 121 (1996).

J.G.P. Binner and T.E. Cross, "The measurement of microwave dielectric properties at high temperature and their use in microwave processing," Proceedings of the 25th General Assembly of the International Union of Radio Science (1996).

K. Czotscher, E.C. Larkins, S. Weisser, W. Benz, J. Daleiden, J. Fleissner, M. Maier, J.D. Ralston, B. Romero, A. Schonfelder and J. Rosenzweig, "Ultra-high-speed InGaAs/GaAs MQW Lasers with C-doped active regions," Proceedings SPIE, Vol. 2684, 153 (1996).

K. Czotscher, E.C. Larkins, S. Weisser, A. Schonfelder, W. Benz, J. Daleiden, J. Fleissner, M. Maier, J.D. Ralston, B. Romero and J. Rosenzweig, "Ultra-high-speed InGaAs/GaAs MQW lasers with C-doped active regions," SPIE International Symposium - Lasers and Integrated Optoelectronics: High Speed Semiconductor Sources (1996).

A.J. Phillips, J.M. Senior, M.S. Leeson, M.O. van Deventer and P.J.M. Peters, "Upgrade scenarios for Super-PONs," Proceedings of the Third Manchester Communication Networks Symposium, 107 (1996).

J.M. Senior, A.J. Phillips, M.S. Leeson, R. Johnson, M.O. van Deventer, P.J.M. Peters, I. Van de Voorde, "Upgrading SuperPON: next step for future broadband access networks," Proceedings SPIE, Vol. 2919, 260 (1996).

Publications for 1995

S. Weisser, E.C. Larkins, K. Czotscher, W. Benz, J. Daleiden, J. Fleissner, M. Maier, J.D. Ralston, B. Romero, A. Schonfelder and J. Rosenzweig, "37 GHz direct modulation bandwidth in short-cavity InGaAs/GaAs MQW lasers with C-doped active regions," IEEE LEOS 1995 Annual Meeting Conference Proceedings, Vols. 1 & 2, A91 (1995).

L. Pavesi, M. Henini, D. Johnston and I. Harrison, "A comparison of Si-doped (100), (111)a, (111)b and (311)b Al_xGa_1-xAs samples grown by molecular-beam epitaxy," Semiconductor Science and Technology, Vol. 10, 49 (1995).

A.J. Phillips, R.A. Cryan and J.M. Senior, "A rigorous characterization of optically preamplified pulse position modulation for fibre-optic communication systems," Proceedings SPIE, Vol. 2450, 548 (1995).

R.A. Cryan, A.J. Phillips and J.M. Senior, "An improved analysis for optically preamplified pulse-position modulation receivers in optical fibre systems," Microwave and Optical Technology Letters, Vol. 10, 108 (1995).

A.J. Phillips, R.A. Cryan and J.M. Senior, "An improved Gaussian approximation for optically preamplified PPM systems including the effect of timing jitter," Microwave and Optical Technology Letters, Vol. 10, 31 (1995).

A.J. Phillips, R.A. Cryan and J.M. Senior, "An optically preamplified PPM intersatellite system described by a moment generating function formulation," Microwave and Optical Technology Letters, Vol. 8, 200 (1995).

N. Baba-Ali, I. Harrison and B. Tuck, "Arsenic pressure-dependence of group-III atom interdiffusion in GaAs-AlAs single-well heterostructures," Journal of Materials Science - Materials in Electronics, Vol. 6, 127 (1995).

D.E. Lacklison, J.W. Orton, I. Harrison, T.S. Cheng, L.C. Jenkins, C.T. Foxon and S.E. Hooper, "Band-gap of GaN films grown by molecular-beam epitaxy on GaAs and gap substrates," Journal of Applied Physics, Vol. 78, 1838 (1995).

M.D. Wilson, J.M. Senior, A.J. Phillips, R.A. Cryan and I. Hawker, "Bursty traffic modelling for ATM networks," Proceedings SPIE, Vol. 2450, 90 (1995).

H. Kurschner, A. Ehrhardt G. Nutsch, I. Harrison, A. Boerner and T. Mickley, "Calculating pre-arcing times using finite-element method," Proceedings of the 5th ICEFA conference, Ilmenau, Germany, Published by VDE-Verlag Berlin, Ed. G. Nutsch, 156 (1995).

M. Munu, I. Harrison and M.S. Woolfson, "Comparison of the Kalman, αβ and αβγ filters for the tracking of targets using radar with variable update time," Applied Signal Processing, Vol. 2, 24 (1995).

S. Weisser, E.C. Larkins, K. Czotscher, W. Benz, J. Daleiden, I. Esquivias, J. Fleissner, M. Maier, J.D. Ralston, B. Romero, R.E. Sah, A. Schonfelder and J. Rosenzweig, "CW direct modulation bandwidths up to 40 GHz in short-cavity In_0.35Ga_0.65As/GaAs MQW lasers with undoped active regions," Proceedings of European Conference on Optical Communications (ECOC) 1995, Vols. 1 - 4, 1015 (1995).

P. Chazan, M. Mikulla, W. Benz, J. Daleiden, J. Fleissner, G. Kaufel, A. Wetzel, E.C. Larkins, M. Maier, J.D. Ralston and J. Rosenzweig, "Diodes laser trapezoidales de puissance (7.2 W QCW) a 1.02 µm," Proceedings of journees national d'optique guidee (1995).

H. Schneider and E.C. Larkins, "Field dependence of carrier capture in GaAs/AlAs/AlGaAs double-barrier quantum-well structures," Semiconductor Science and Technology, Vol. 10, 1329 (1995).

M. Mikulla, W. Benz, P. Chazan, J. Daleiden, J. Fleissner, G. Kaufel, E.C. Larkins, M. Maier, J.D. Ralston, J. Rosenweig and A. Wetzel, "High power tapered InGaAs laser diodes with carbon doped clading layers grown by solid source molecular beam epitaxy," International symposium on compound semiconductors (1995).

R.A. Cryan, A.J. Phillips and J.M. Senior, "Improved formulation for optically preamplified PPM receivers incorporating timing jitter effects," Proceedings SPIE, Vol. 2614, 20 (1995).

E.C. Larkins, W. Benz, W. Rothemund, S. Weisser, A. Schonfelder, J. Fleissner, W. Jantz, J. Rosenzweig and J.D. Ralston, "Improved performance from psedomorphic In_yGa_l-yAs/GaAs MQW lasers with low growth temperature Al_xGa_l-xAs short-period superlattice cladding," IEEE Photonics Technology Letters, Vol. 7, 16 (1995).

S. Burkner, E.C. Larkins, M. Baeumler, J. Wagner, W. Rothemund, G. Flemig and J.D. Ralston, "Impurity-free selective interdiffusion of pseudomorphic In_yGa_l-yAs/GaAs laser and modulator structures," Materials Science and Technology, Vol. 11, 840 (1995).

E.C. Larkins and J.S. Harris, "Molecular Beam Epitaxy of High Quality GaAs and AlGaAs," in Molecular Beam Epitaxy: Applications to Key Materials, ed. R. Farrow, Noyes Publications, New York (1995).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Novel laser intersatellite communication system employing optically PPM receivers," IEE Proceedings Communications, Vol. 142, 15 (1995).

D.H. Sutter, H. Schneider, S. Weisser, J.D. Ralston and E.C. Larkins, "Picosecond spectroscopy of optically modulated high-speed laser diodes," Applied Physics Letters, Vol. 67, 1809 (1995).

S. Burkner, M. Maier, E.C. Larkins, W. Rothemund, E.P. O'Reilly and J.D. Ralston, "Process parameter dependence of impurity-free interdiffusion in GaAs/Al_xGa_l-xAs and In_yGa_l-yAs/GaAs MQW's," Journal of Electronic Materials, Vol. 24, 805 (1995).

R.E. Sah, J.D. Ralston, G. Eichin, B. Dischler, W. Rothemund, J. Wagner and E.C. Larkins, "Room-temperature, high-deposition-rate, plasma-enhanced chemical vapour deposition of silicon oxynitride thin films producing low surface damage on lattice-matched and pseudomorphic III-V quantum well structures," Thin Solid Films, Vol. 259, 225 (1995).

D.H. Sutter, H. Schneider, J. Rosenzweig, J.D. Ralston and E.C. Larkins, "Schaltung der Verstarkung in schnellen Laserdioden: Signalanalyse fur mittlere Intensitaten," Deutschen Physikalischen Gesellschaft, Vol. 7, 1160 (1995).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Sensitivity evaluation of optically preamplified digital PPM receivers," Proceedings of the Second Manchester Communication Networks Symposium, 6 (1995).

A. Majewski and S. Sujecki, "Swiatlowody prostokatne:wlasciwosci propagacyjne (Rectangular optical waveguides)," Konferencja Swiatlowody i ich zastosowania, Bialowieza 1995 (1995).

J.D. Ralston, F.R. Laughton, P. Chazon, E.C. Larkins, M. Maier, M.K. Abd Rahman and I.H. White, "Tapered InGaAs/GaAs MQW lasers with carbon modulation doping and reduced filamentation," Electronics Letters, Vol. 31, 651 (1995).

A. Majewski and S. Sujecki, "The analysis of the rib-lightguide structures by finite difference method," International Seminar on Environment Modelling, Riga 1995, 257-266 (1995).

R.D. Harrison, I. Harrison and A.F. Howe, "Thin film fuse link," Proceedings of the 5th ICEFA conference, Ilmenau, Germany, Published by VDE-Verlag Berlin, Ed. G. Nutsch, 169 (1995).

S. Ehret, H. Schneider, E.C. Larkins and J.D. Ralston, "Tunneling-assissted thermionic emission in double-barrier quantum well structures," Journal of Applied Physics, Vol. 77, 2537 (1995).

S. Burkner, J.D. Ralston, S. Weisser, J. Rosenweig, E.C. Larkins, R.E. Sah and J. Fleissner, "Wavelength tuning of high-speed InGaAs/GaAs/AlGaAs pseudomorphic MQW lasers via impurity-free interdiffusion," IEEE Photonics Technology Letters, Vol. 7, 941 (1995).

Publications for 1994

H. Schneider, S. Ehret, E.C. Larkins, J.D. Ralston and P. Koidl, "A novel transport mechanism for photovoltaic quantum well intersubband infrared detectors," Quantum Well Intersubband Transition Physics and Devices NATO ASI Series E: Applied Sciences, Vol. 270, 187 (1994).

J.M. Senior, M.D. Wilson, A.J. Phillips, R.A. Cryan and I. Hawker, "A programmable bursty traffic algorithm for use in packet-level discrete time packet switch simulation studies," Proceedings of IEEE ICCS '94, Vol. 3, 1001 (1994).

I. Harrison, "A theoretical-study of the photoluminescence energy shifts of interdiffused quantum-wells," Semiconductor Science and Technology, Vol. 9, 2053 (1994).

M.D. Wilson, A.J. Phillips, J.M. Senior, R.A. Cryan and I. Hawker, "An algorithm for generating bursty traffic," Proceedings of Manchester Communication Networks Symposium, 110 (1994).

R.A. Cryan, A.J. Phillips and J.M. Senior, "An optically preamplified PPM threshold detection receiver for satellite communications," Microwave and Optical Technology Letters, Vol. 7, 324 (1994).

I. Harrison, L. Pavesi, M. Henini and D. Johnston, "Annealing effects on Si-doped GaAs grown on high-index planes by molecular-beam epitaxy," Journal of Applied Physics, Vol. 75, 3151 (1994).

M. Seelmann-Eggebert, R. Klauser, G.P. Carey, E.C. Larkins, P. Meisen and H.J. Richter, "Assessing surface reconstructions by angle-scanned X-ray photoelectron diffraction," Proceedings of 4th International Conference on the Structure of Surfaces (1994).

J. Arias, J.D. Ralston, I. Esquivias, E.C. Larkins, S. Weisser, J. Rosenzweig and M. Maier, "Capacitance-voltage carrier profiling of In_0.35Ga_0.65As/GaAs MQW laser diodes with p-doping," Proceedings of 14th General Condensed Matter Division European Physical Society (1994).

H. Schneider, S. Ehret, E.C. Larkins, I. Vinattieri and J. Shah, "Capture of carriers excited by interband and intersubband absorption in GaAs/AlAs/AlGaAs double-barrier quantum wells," Superlattices and Microstructures, Vol. 16, 331 (1994).

G. Bender, H. Schneider, K. Schwartz and E.C. Larkins, "Charakterisierung des Hochgeschwindigkeitsverhaltens von p-i-n Photodioden mittels nichtlinearer Photostromspektroscopie," Deutschen Physikalischen Gesellschaft, Vol. 5, 1065 (1994).

S. Burkner, M. Baeumler, J. Wagner, E.C. Larkins, G. Flemig, W. Rothemund and J.D. Ralston, "Compatibility of impurity-free selective interdiffusion with high-speed and high-power pseudomorphic In_yGa_l-yAs/GaAs MQW lasers," IEEE LEOS 1994 Annual Meeting Proceedings, 48 (1994).

I. Esquivias, S. Weisser, A. Schonfelder, J.D. Ralston, P.J. Tasker, E.C. Larkins, J. Fleissner, W. Benz and J. Rosenzweig, "DC and high-frequency properties of In_0.35Ga_0.65As/GaAs strained-layer MQW laser diodes with p-doping," Institute of Physics Conference Series, Vol. 136, 265 (1994).

J.D. Ralston, S. Weisser, A. Schonfelder, E.C. Larkins, J. Rosenzweig, W. Bronner, J. Hornung and K. Kohler, "Device and process technology for monolithic high-speed, low-chirp semiconductor laser transmitters," Technical Digest of CLEO '94, 275 (1994).

S. Weisser, J.D. Ralston, K. Eisele, R.E. Sah, J. Hornung, E.C. Larkins, P.J. Tasker, W. Benz, J. Rosenweig, W. Bonner, J. Fleissner and K. Bender, "Dry-etched short-cavity ridge waveguide MQW lasers suitable for monolithic integration with direct modulation bandwidth up to 33 GHz at low drive currents," Proceedings of the European Conference on Optical Communications (ECOC) 1994, Vol. 2, 973 (1994).

S. Ehret, H. Schneider and E.C. Larkins, "Einfluss von Dotierstoffverschleppung und Tunnelbarrieren-Dicke auf das Photostrom- und Dunkelstromverhalten von Doppelbarrieren Quantentopf Infrarotdetektoren," Deutschen Physikalischen Gesellschaft, Vol. 5, 1102 (1994).

E.C. Larkins, H. Thaden, H. Betsche, G. Eichin and J.D. Ralston, "Elimination of long-term calibration drift in MBE by cooling the source flange," Journal of Vacuum Science and Technology B, Vol. 12, 3220 (1994).

J.D. Ralston, K. Eisele, R.E. Sah, S. Burkner S, J. Fleissner, G. Bender, E.C. Larkins and S. Weisser, "Enhanced dry-etched mirror process for high-speed and monolithically integrated GaAs-based MQW lasers," IEEE/LEOS Summer Topical Meeting on Optoelectronic Materials Growth and Processing (1994).

H. Schneider, J.D. Ralston, E.P. O'Reilly, S. Weisser and E.C. Larkins, "Gain switching in high-speed semiconductor lasers: Intermediate-signal analysis," Applied Physics Letters, Vol. 65, 661 (1994).

E.C. Larkins, H. Schneider, S. Ehret, J. Fleissner, B. Dischler, P. Koidl and J.D. Ralston, "Influences of MBE Growth Processes on Photovoltaic 3-5 µm Intersubband Photodetectors," IEEE Transactions on Electron Devices, Vol. 41, 511-518 (1994).

M. Baeumler, E.C. Larkins, K.H. Bachem, D. Bernklau, H. Riechert, J.D. Ralston and W. Jantz, "Influence of substrate dislocations on epitaxial layers studied by photoluminescence microscopy and topography," Institute of Physics Conference Series, Vol. 135, 169 (1994).

G. Flemig, R. Brenn, E.C. Larkins, S. Burkner, G. Bender, M. Baeumler and J.D. Ralston, "Ion-channeling studies of In_yGa_l-yAs/GaAs strained-layer single and multiple quantum-well structures," Journal of Crystal Growth, Vol. 143, 29 (1994).

J.D. Ralston, K. Eisele, R.E. Sah, E.C. Larkins, S. Weisser, J. Rosenzweig, J. Fleissner and K. Bender, "Low-bias-current direct modulation up to 33 GHz in InGaAs/GaAs/AlGaAs pseudomorphic MQW ridge-waveguide lasers," Proceedings of the 14th IEEE International Semiconductor Laser Conference, 211 (1994).

J.D. Ralston, S. Weisser, K. Eisele, R.E. Sah, E.C. Larkins, J. Rosenzweig, J. Fleissner and K. Bender, "Low-bias-current direct modulation up to 33 GHz in InGaAs/GaAs/AlGaAs pseudomorphic MQW ridge-waveguide lasers," IEEE Photonics Technology Letters, Vol. 6, 1076 (1994).

E.C. Larkins, W. Rothemund, J. Wagner, M. Baeumler, S. Burkner, W. Benz, S. Weisser, A. Schonfelder, G. Flemig, R. Brenn, J. Fleissner, W. Jantz, J. Rosenzweig and J.D. Ralston, "MBE growth of GaAs-based pseudomorphic lasers: Key growth trade-offs between the InGaAs MQWs and the AlGaAs cladding," IEEE/LEOS Summer Topical Meeting on Optoelectronic Materials Growth and Processing (1994).

E.C. Larkins, M. Baeumler, J. Wagner, G. Bender, N. Herres, M. Maier, W. Rothemund, J. Fleissner, W. Jantz, J.D. Ralston, G. Flemig and R. Brenn, "MBE growth of In_0.35Ga_0.65As/GaAs MQWs for high-speed lasers: relaxation limits and factors influencing dislocation glide," Institute of Physics Conference Series, Vol. 136, 523 (1994).

H. Schneider, A. Vinattieri, J. Shah, S. Ehret, E.C. Larkins and M. Rossmanith, "Non-resonant electron capture in GaAs/A1As/A1GaAs double-barrier quantum well infrared detectors," Applied Physics Letters, Vol.64, 1015 (1994).

R.A. Cryan, A.J. Phillips and J.M. Senior, "Optical fibre n-ary PPM soliton systems," Proceedings of the EFOC&N 94 (Optical Communication Systems and Optical Access Networks), 195 (1994).

R.A. Cryan, A.J. Phillips and J.M. Senior, "Optical-fiber PPM soliton systems: Implications of the Gordon-Haus effect," Microwave and Optical Technology Letters, Vol. 7, 2 (1994).

O. Humbach, R. Soyka, A. Stohr, S. Burkner, J.D. Ralston, E.C. Larkins and D. Jager, "Partial interdiffusion of InGaAs/GaAs MQW modulators for photonic integration," Technical Digest of Integrated Photonics Research, OSA, Vol. 3, 157 (1994).

R.A. Cryan, A.J. Phillips and J.M. Senior, "Performance analysis of optically preamplified PPM receivers," Proceedings of ISITA '94, Vol. 1, 349 (1994).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Performance evaluation of optically pre-amplified PPM systems," IEEE Photonics Technology Letters, Vol. 6, 651 (1994).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Performance evaluation of the PPM format for PONs," Proceedings of Manchester Communication Networks Symposium 223 (1994).

H. Schneider, S. Ehret, E.C. Larkins, J.D. Ralston and P. Koidl, "Photovoltaic QW intersubband detectors: operational principle, theoretical limits, and dynamical behavior," Proceedings of the 186th meeting of the electrochemical society (1994).

H. Schneider, S. Ehret, E.C. Larkins, J.D. Ralston, K. Schwarz and P. Koidl, "Photovoltaic quantum well intersubband infrared detectors by internal electrical fields," Institute of Physics Conference Series, Vol. 136, 295 (1994).

R.A. Cryan, A.J. Phillips and J.M. Senior, "Pulse position modulation for optically amplified passive optical networks," Proceedings of IEEE ICCS '94, Vol. 1, 154 (1994).

H. Schneider, S. Ehret, E.C. Larkins, P. Koidl and J.D. Ralston, "Quantumwell-Intersubband-IR-Detektoren fur FPA-Kameras und Heterodyn-Anwendungen bei 3-5 µm und 8-12 µm," Wissenschaft zum Technischen Universitaet Dresden, Vol. 43, 1113 (1994).

G. Bender, E.C. Larkins, H. Schneider, J.D. Ralston and P. Koidl, "Strain relaxation in In_0.2Ga_0.8As/GaAs MQW Structures," Institute of Physics Conference Series, Vol. 136, 385 (1994).

A.J. Phillips, R.A. Cryan and J.M. Senior, "Viability of optical fibre PPM soliton systems with Gordon-Haus effect reduction," Optics Communications, Vol. 107, 255 (1994).

Publications for 1993

J.D. Ralston, S. Weisser, E.C. Larkins, I. Esquivias, P.J. Tasker, J. Fleissner and J. Rosenzweig, "30 GHz direct modulation in p-doped In_0.35Ga_0.65As/GaAs MQW lasers," Institute of Physics Conference Series, Vol. 129, 949 (1993).

C. Vetesse, I. Harrison, T.M. Benson, M. Robertson and D. Murrell, "An investigation into the effects of thermal annealing on long wavelength InGaAs/InGaAsP multiquantum well lasers," Proceedings of InP and related compounds conference, Paris, April, 1993, Ch. 184, 40 (1993).

N. Baba-Ali, I. Harrison, H.P Ho, B. Tuck and M. Henini, "Annealing-induced dislocation loops in Si-doped GaAs/AlAs superlattices," Journal of Materials Science - Materials in Electronics, Vol. 4, 29 (1993).

J.D. Ralston, S. Weisser, I. Esquivias, E.C. Larkins, J. Rosenzweig, P.J. Tasker and J. Fleissner, "Control of differential gain, nonlinear gain, and damping factor for high-speed applications of GaAs-based MQW lasers," IEEE Journal of Quantum Electronics, Vol. 29, 1648 (1993).

J. Wagner, E.C. Larkins, N. Herres, J.D. Ralston and P. Koidl, "Defect and strain redistribution in In_xGa_l-xAs/GaAs multiple quantum wells studied by resonant Raman scattering," Applied Physics Letters, Vol. 63, 1842 (1993).

J.D. Ralston, E.C. Larkins, W. Rothemund, I. Esquivias, S. Weisser, J. Rosenzweig and J. Fleissner, "Enhancements in MBE-grown high-speed GaAs and In_0.35Ga_0.65As MQW laser structures using binary short-period superlattices," Journal of Crystal Growth, Vol. 127, 19 (1993).

I. Harrison, "Impurity-induced disordering in III-V multiquantum wells and superlattices," Journal of Materials Science - Materials in Electronics, Vol. 4, 1 (1993).

A. Stohr, O. Humbach, S. Zumkley, G. Wingen, G. David, B. Bollig, E.C. Larkins, J.D. Ralston and D. Jager, "InGaAs/GaAs multiple-quantum-well modulators and switches," Optical and Quantum Electronics, Vol. 25, S865 (1993).

E.C. Larkins, W. Rothemund, M. Maier, Z.M. Wang, J.D. Ralston and W. Jantz, "MBE growth optimization of In_yGa_l-yAs/GaAs multiple quantum well structures," Journal of Crystal Growth, Vol. 127, 541 (1993).

J.D. Ralston, S. Weisser, I. Esquivias, D.F.G. Gallagher, E.C. Larkins, J. Rosenzweig, P.J. Tasker and J. Fleissner, "Mechanisms for the modulation bandwidth enhancement in high-speed GaAs/AlGaAs and InGaAs/GaAs MQW lasers," Institute of Physics Conference Series, Vol. 129, 809 (1993).

M. Seelmann-Eggebert, R. Fasel, E.C. Larkins and J. Osterwalder, "Monolayer resolved X-ray excited Auger electron diffraction from single plane emission in GaAs," Physical Review B: Condensed Matter, Vol. 48, 838 (1993).

R.A Cryan, A.J Phillips and J.M. Senior, "Optical fibre PPM employing direct detection optically preamplified receivers," Proceedings SPIE, Vol. 1974, 138 (1993).

A.J Phillips, R.A. Cryan and J.M. Senior, "Optical fibre PPM with optical preamplification," Proceedings of the 5th Bangor Symposium on Communications, 284 (1993).

R.A Cryan, A.J Phillips and J.M. Senior, "Optically pre-amplified n-ary PPM systems," Proceedings SPIE, Vol. 2024, 72 (1993).

L. Pavesi, F. Piazza, M. Henini and I. Harrison, "Orientation dependence of the Si doping of GaAs grown by molecular-beam epitaxy," Semiconductor Science and Technology, Vol. 8, 167 (1993).

J.D. Ralston, S. Weisser, I. Esquivias, A. Schonfelder, E.C. Larkins, J. Rosenzweig, P.J. Tasker, M. Maier and J. Fleissner, "p-dopant incorporation and influence on gain and damping behavior in high-speed GaAs-based strained MQW lasers," Materials Science and Engineering, Vol. B21, 232 (1993).

J.D. Ralston, S. Weisser, A. Schonfelder, I. Esquivias, E.C. Larkins, J. Rosenzweig and P.J. Tasker, "Performance and optoelectronic integration of GaAs-based high-speed semiconductor lasers," IEEE LEOS 1993 Annual Meeting Proceedings, 637 (1993).

Z.M. Wang, M. Baeumler, W. Jantz, K.H. Bachem, E.C. Larkins and J.D. Ralston, "Photoluminescence microscopy investigation of lattice defects in epitaxial heterostructures," Journal of Crystal Growth, Vol. 126, 205 (1993).

L. Pavesi, F. Piazza, I. Harrison and M. Henini, "Si doping of GaAs grown by molecular beam epitaxy on different substrate orientations," Materials Science Forum, Vol. 117-118, 387 (1993).

H. Schneider, E.C. Larkins, J.D. Ralston, K. Schwarz, F. Fuchs and P. Koidl, "Space charge effects in photovoltaic double barrier quantum well infrared detectors," Applied Physics Letters, Vol. 63, 782 (1993).

O. Humbach, A. Stohr, U. Auer, E.C. Larkins, J.D. Ralston and D. Jager, "Strained-layer multiple quantum well InGaAs/GaAs waveguide modulators operating around 1µm," IEEE Photonics Technology Letters, Vol. 5, 49 (1993).

E.C. Larkins, G. Bender, H. Schneider, J.D. Ralston, J. Wagner, W. Rothemund, B. Dischler, J. Fleissner and P. Koidl, "Strain-relaxed, high-speed In_0.2Ga_0.8As MQW p-i-n photodetectors grown by MBE," Journal of Crystal Growth, Vol. 127, 62 (1993).

G. Bender, E.C. Larkins, H. Schneider, J.D. Ralston and P. Koidl, "Strain relaxation in high-speed p-i-n photodetectors with In_0.2Ga_0.8As/GaAs multiple quantum wells," Applied Physics Letters, Vol. 63, 2920 (1993).

M. Munu, I. Harrison and M.S. Woolfson, "Tracking performances measures and optimisation conditions for phased array radar," ICSPAT 1993 Santa Clara, California, USA (1993).

Publications for 1992

J.D. Ralston, I. Esquivias, S. Weisser, D.F.G. Gallagher, P.J. Tasker, E.C. Larkins, J. Rosenzweig, H.P. Zappe, J. Fleissner and D.J. As, "16 GHz GaAs/AlGaAs multiple quantum well laser with vertically compact waveguide structure," Proceedings SPIE, Vol. 1680, 127 (1992).

M. Munu, I. Harrison, D. Wilkin and M.S. Woolfson, "Comparison of adaptive target-tracking algorithms for phased array radar," IEE Proceedings-F Radar Signal Processing, Vol. 139, 336 (1992).

M. Munu, I. Harrison and M.S. Woolfson, "Comparison of Kalman and αβ filters for the tracking of targets using phased array radar," IEE Radar '92 Conference, Brighton, UK, IEE conference publication 365, 196 (1992).

A. Schonfelder, S. Weisser, J.D. Ralston, E.C. Larkins, I. Esquivias, J. Fleissner, P.J. Tasker and J. Rosenzweig, "Comparison of ultrahigh-speed (30 GHz) undoped and p-doped In_0.35Ga_0.65As/GaAs MQW lasers," IEEE LEOS 1992 Annual Meeting Proceedings, PD1 (1992).

H. Schneider, E.C. Larkins, J.D. Ralston, J. Fleissner, G. Bender and P. Koidl, "Diffusive electrical conduction in high-speed p-i-n photodetectors," Applied Physics Letters, Vol. 60, 2648 (1992).

S. Weisser, J.D. Ralston, E.C. Larkins, I. Esquivias, P.J. Tasker, J. Fleissner and J. Rosenzweig, "Efficient high-speed direct modulation in p-doped In_0.35Ga_0.65As/GaAs multiple quantum well lasers," Electronics Letters, Vol. 28, 2141 (1992).

S. Weisser, J.D. Ralston, E.C. Larkins, I. Esquivias, P.J. Tasker, J. Fleissner and J. Rosenzweig, "High-frequency characterization of 30 GHz p-type modulation-doped In_0.35Ga_0.65As/GaAs MQW lasers," Technical Digest of the International Electron Device Meeting 1992, 1009 (1992).

I. Esquivias, S. Weisser, J.D. Ralston, D.F.G. Gallagher, E.C. Larkins, P.J. Tasker, J. Rosenzweig and J. Fleissner, "High-speed GaAs/AlGaAs multiple quantum well lasers: Design and characterization," IEEE Transactions on Electron Devices, Vol. 39, 2660 (1992).

G. Wingen, S. Zumkley, G. David, E.C. Larkins, J.D. Ralston and D. Jager, "High-speed InGaAs/GaAs multiple quantum well electrooptical modulator," IEEE LEOS 1992 Annual Meeting Proceedings, 694 (1992).

S. Weisser, I. Esquivias, J.D. Ralston, J. Rosenzweig, A. Schonfelder, E.C. Larkins and J. Fleissner, "Influence of facet reflectivity on the differential gain and K-factor in high-speed GaAs/AlGaAs and InGaAs/GaAs MQW lasers," Technical Digest of the International Electron Device Meeting 1992, 863 (1992).

J.D. Ralston, S. Weisser, E.C. Larkins, I. Esquivias, P.J. Tasker, J. Fleissner and J. Rosenzweig, "Modulation bandwidths up to 30 GHz under CW bias in strained In_0.35Ga_0.65As/GaAs MQW lasers with p-doping," Proceedings of 13th IEEE International Semiconductor Laser Conference 1992, 9 (1992).

J. Rosenzweig, J.D. Ralston, S. Weisser, I. Esquivias, D.F.G. Gallagher, P.J. Tasker, E.C. Larkins and J. Fleissner, "Performance comparison of high-speed GaAs/Al_0.25Ga_0.75As and In_0.35Ga_0.65As/GaAs multiple quantum well lasers suitable for monolithic integration," Proceedings of 18th European Conference on Optical Communications (ECOC) 1992, 261 (1992).

L. Pavesi, N.H. Ky, J.D. Ganiere, F.K. Reinhart, N. Baba-Ali, I. Harrison, B. Tuck and M. Henini, "Role of point-defects in the silicon diffusion in GaAs and Al_0.3Ga_0.7As and in the related superlattice disordering," Journal of Applied Physics, Vol. 71, 2225 (1992).

L. Pavesi, F. Piazza, I. Harrison and M. Henini, "Si doping of GaAs grown by molecular beam epitaxy on different substrate orientations," Proceedings of the 5th International Conference on Shallow Impurities in Semiconductors, Japan, Ch. 87, 387 (1992).

Publications for 1991

R.D. Harrison, A.F. Howe and I. Harrison, "Ageing of film fuses on substrates," Proceeding of the 4th International Conference on Electric Fuses and their Applications, University of Nottingham, UK, 85 (1991).

H.P. Ho, I. Harrison, N. Baba-Ali and B. Tuck, "Diffusion-induced defects in GaAs by zinc and the effects of post-diffusion anneal," Journal of Applied Physics, Vol. 69, 3494 (1991).

I. Harrison, H.P. Ho and N. Baba-Ali, "Diffusion induced disorder of GaAs/AlGaAs superlattices," Journal of Electronic Materials, Vol. 20, 449 (1991).

I. Harrison, "Diffusion of impurities," in Properties of Indium Phosphide INSPEC IEE, London, 263 (1991).

O. Humbach, A. Stohr, E.C. Larkins, J.D. Ralston and D. Jager, "InGaAs/GaAs multiple quantum well electro-optic waveguide modulators," IEEE LEOS 1991 Annual Meeting Proceedings (1991).

N. Baba-Ali, I. Harrison, B. Tuck, H.P. Ho and M. Henini, "Sulfur diffusion in GaAs-AlAs superlattices," Optical and Quantum Electronics, Vol. 23, S813 (1991).

D.J. Wilkin, I. Harrison and M.S. Woolfson, "Target tracking algorithms for phased-array radar," IEE Proceedings-F Radar Signal Processing, Vol. 138, 255 (1991).

H.P. Ho, I. Harrison, N. Baba-Ali, B. Tuck and M. Henini, "The effect of arsenic pressure on the diffusion-induced disordering of tin in AlAs/GaAs superlattices," Journal of Materials Science - Materials in Electronics, Vol. 2, 137 (1991).

Publications for 1990

S. Hibbert, N. Baba-Ali and I. Harrison, "A dynamic SIMS study of interdiffusion in GaAs/AlAs heterostructures," III-V Review, Vol. 3, 16 (1990).

N. Baba-Ali, I. Harrison, B. Tuck, H.P. Ho, M. Henini and O.H. Hughes, "Annealing of GaAs/AlAs superlattices," Journal of Materials Science - Materials in Electronics, Vol. 1, 133 (1990).

I. Harrison and B. Tuck, "Diffusion of impurities," in Properties of Gallium Arsenide INSPEC IEE, London, 341 (1990).

I. Harrison, "Diffusion induced disorder in AlGaAs/GaAs," Journal of Electronic Materials, Vol. 19, 21 (1990).

I. Harrison, "Modelling of the Generation of Ga Interstitials during the diffusion of Zn into GaAs," International Journal of Numerical Modelling, Vol. 3, 91 (1990).

I. Harrison, H.P. Ho, B. Tuck, M. Henini and O.H. Hughes, "The effect of as on zn diffusion-induced disordering of AlAs/GaAs superlattices," Semiconductor Science and Technology, Vol. 5, 561 (1990).

Publications for 1989

E.C. Larkins, D. Liu, Y.C. Pao, M.J. Lin, G.W. Yoffe and J.S. Harris, "Characterization of AlGaAs and GaAs materials and interfaces grown on misoriented (110) GaAs by MBE," Institute of Physics Conference Series, Vol. 96, 53 (1989).

R. Kohrbruck, S. Munnix, D. Bimberg, E.C. Larkins and J.S. Harris, "Flux ratio dependence of growth rate, interface quality, and impurity incorporation in MBE grown AlGaAs/GaAs quantum wells," Institute of Physics Conference Series, Vol. 96, 65 (1989).

S. Munnix, R.K. Bauer, D. Bimberg, J.S. Harris, R. Kohrbruck, E.C. Larkins, C. Maierhofer, D.E. Mars and J.N. Miller, "Growth kinetics, impurity incorporation, defect generation and interface quality of MBE-grown AlGaAs/GaAs quantum wells: Role of group III and group V fluxes," Journal of Vacuum Science and Technology B, Vol. 7, 704 (1989).

R. Kohrbruck, S. Munnix, D. Bimberg, E.C. Larkins and J.S. Harris, "Influence of the As:Ga flux ratio on growth rate, interface quality, and impurity incorporation in AlGaAs/GaAs quantum wells grown by molecular beam epitaxy," Applied Physics Letters, Vol. 54, 623 (1989).

L. Avaldi, G. Stefani, A. Lahman-Bennani, A. Duguet, I. Harrison and G.C. King, "Near threshold effects in Ar and C0 Auger spectra," in Auger Spectroscopy and Electronic Structure Springer Series in Surface Science, Vol. 8, Springer-Verlag, Berlin, 171 (1989).

S. Munnix, D. Bimberg, D.E. Mars, J.N. Miller, E.C. Larkins and J.S. Harris, "Observation of a many-body edge singularity in the luminescence spectra of GaAs/AlGaAs modulation doped heterostructures," Acta Physica Polonica: Series A, Vol. 75, 33 (1989).

S. Munnix, D. Bimberg, D.E. Mars, J.N. Miller, E.C. Larkins and J.S. Harris, "Optical properties of one- and two-component plasma in GaAs/AlGaAs n-modulation doped heterostructures," Superlattices and Microstructures, Vol. 6, 369 (1989).

D. Liu, T. Zhang, E.C. Larkins, T.T. Chiang, R.A. LaRue, J.S. Harris, T.W. Sigmon and W.E. Spicer, "Sodium sulfide treated (100) and (110) GaAs surfaces," Institute of Physics Conference Series, Vol. 96, 371 (1989).

B. Lee, M.H. Kim, S.S. Bose, G.E. Stillman, E.C. Larkins, E.S. Hellman, D.G. Schlom and J.S. Harris, "Sulfur incorporation in undoped high purity n-type GaAs grown by molecular beam epitaxy," Institute of Physics Conference Series, Vol. 96, 23 (1989).

I. Harrison, H.P. Ho, B. Tuck, M. Henini and O.H. Hughes, "Zn diffusion-induced disorder in AlAs/GaAs superlattices," Semiconductor Science and Technology, Vol. 4, 841 (1989).

Publications for 1988

I. Harrison, G.C. King and L. Avaldi, "A study of Auger satellite decay from inner-shell states of C0 excited close to threshold," XIV Summer School and International Symposium on the Physics of Ionised Gases, Igmen Mountain, near Sarajevo, Yugoslavia (1988).

I. Harrison, G.C. King and L. Avaldi, "A study of satellite Auger decay from inner-shell states of C0 excited close to threshold," Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 21, 4015 (1988).

M.J. Lin, E.C. Larkins, Y.C. Pao, D. Liu, G. Yoffe, T.K. Ma and J.S. Harris, "Characterization of Al_0.25Ga_0.75As grown by molecular beam epitaxy," Journal of Vacuum Science and Technology B, Vol. 6, 631 (1988).

S. Munnix, D. Bimberg, D.E. Mars, J.N. Miller, E.C. Larkins and J.S. Harris, "High carrier densities in GaAs/AlGaAs modulation n-doped quantum wells: From one- to two- component plasma," Proceedings of the 19th International Conference on the Physics of Semiconductor (ICPS) (1988).

E.C. Larkins, Y.C. Pao, D. Liu, M.J. Lin, G. Yoffe and J.S Harris, "Summary Abstract: Growth of GaAs and AlGaAs on misoriented (110) GaAs by molecular-beam epitaxy," Journal of Vacuum Science and Technology B, Vol. 6, 636 (1988).

Publications for 1987

I. Harrison and G.C. King, "Excitation of inner-shell states of C0₂, C0S, CS₂, N₂0 and C₂H₂ by low energy electron impact," Journal of Electron Spectroscopy and Related Phenomena, Vol. 43, 155 (1987).

E.C. Larkins, E.S. Hellman, D.G. Schlom, J.S. Harris, M.H Kim and G.E. Stillman, "GaAs with very low acceptor impurity background grown by molecular beam epitaxy," Journal of Crystal Growth, Vol. 81, 344 (1987).

B. Lee, S.S. Bose, M.H. Kim, G.E. Stillman, W.I. Wang, E.C. Larkins, J.S. Harris and A.R. Calawa, "Residual impurities in high-purity undoped n-type MBE GaAs," Journal of Electronic Materials, Vol. 16, A16 (1987).

Publications for 1986

E.C. Larkins, E.S. Hellman, D.G. Schlom, J.S. Harris, M.H. Kim and G.E. Stillman, "Reduction of the acceptor impurity background in GaAs grown by molecular beam epitaxy," Applied Physics Letters, Vol. 49, 391 (1986).

I. Harrison and G.C. King, "The observation of resonance structures in electron impact excitation functions of inner-shell states of CO," Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 19, L447 (1986).

E.C. Larkins, E.S. Hellman, D.G. Schlom and J.S. Harris, "Ultra-high purity gallium arsenide (GaAs) grown by molecular beam epitaxy," Varian Associates Semiconductor Equipment Group Newsletter, Vol. 2 (1986).