RESEARCH INTERESTS

• Theoretical semiconductor physics and optoelectronic devices modelling

  • Theoretical design and development of mid-infrared and terahertz photodetector

  • Modelling of novel blue-shifting modulators

  • Quantum interference effects in quantum wells

  • Quantum dot lasers in mid-infrared

PUBLICATIONS

K. T. Lai, R. Gupta, M. Missous and S. K. Haywood, Intersubband Absorption from 2-7mm in Strain-compensated Double-barrier In(x)Ga(1-x)As Multiquantum Wells, Semiconductor Science Technology, 19 (5) pp. 1263-1267 (2004)

M. Missous, C. J. Mitchell, S. L. Sly, K. T. Lai, R. Gupta and S. K. Haywood, Highly Strain In(x)Ga(1-x)As-In(y)Al(1-y)As (x>0.8, y<0.3) Layers for Short Wavelength QWIP and QCL Structures Grown by MBE, Physica E, 20 (5) pp. 496-502 (2004)

R. Gupta, K. T. Lai, M. Missous and S. K. Haywood, Subband Non-parabolicity Estimated from Multiple Intersubband Absorption in Highly Doped Multiquantum Wells, Physical Review B, 69 p. 033303 (2004)

K. T. Lai, M. Missous, R. Gupta and S. K. Haywood, Intersubband Absorption in Strain-compensated InAlAs/AlAs/In_xGa_1-xAs (x~0.8) Quantum Wells Grown on InP, Journal of Applied Physics, 93 (10) pp. 6065-6067 (2003)

K. T. Lai, S. K. Haywood, R. Gupta and M. Missous, Observation of Intersubband Absorption in the Forbidden Polarisation for a Stepped Double Barrier Quantum Wells, IEE Proceedings - Optoelectronics, 150 (4) pp. 377-380 (2003)

K. T. Lai, S. K. Haywood, R. Gupta and M. Missous, Enhanced Intersubband Absorption in Stepped Double Barrier Quantum Wells, Electronics Letters, 38 (11) pp. 529-530 (2002)

CONFERENCE AND MEETING PRESENTATIONS

K. T. Lai, R. Gupta, M. Missous and S. K. Haywood, Intersubband Absorption from 2-7mm using Strain-compensated Double-barrier InGaAs Multiquantum Wells, Poster presented at 27th International Conference on the Physics of Semiconductors, Flagstaff, Arizona, USA, 26th-30th July 2004.

R. Gupta, K. T. Lai, M. Missous and S. K. Haywood, A Study of Intersubband Absorption for l≤6mm in Strain-compensated AlInAs/AlAs/InGaAs Multiple-quantum Wells, Poster presented at 6th International Conference on Mid-Infrared Optoelectronics Materials & Devices, St. Petersburg, Russia, 28th June-1st July 2004.

R. Gupta, K. T. Lai, M. Missous and S. K. Haywood, Subband Non-parabolicity Determined from Intersubband Absorption in Strain-compensated InGaAs MQWs, International Conference on Intersubband Transitions in Quantum Wells, Evolene, Switzerland, 1st-5th September 2003.

M. Missous, C. J. Mitchell, J. Sly, K. T. Lai, R. Gupta and S. K. Haywood, Highly Strained In_xGa_1-xAs-In_yAl_1-yAs (x>0.8, y<0.3) Layers for Short Wavelength QWIP and QCL Structures Grown by MBE, Invited Talk (by M.Missous) at NGS-11 in Buffalo, USA, 16th-20th June 2003.

K. T. Lai, M. Missous, R. Gupta and S. K. Haywood, Intersubband Absorption in Strain-compensated InAlAs/AlAs/In_xGa_1-xAs (x~0.8) Quantum Wells Grown on InP, Presented at the 7th Mid-Infrared Network Meeting, Hull University, Hull, UK, 19th March 2003.

K. T. Lai, S. K. Haywood, R. Gupta and M. Missous, Enhanced Intersubband Absorption in Stepped Double Barrier Quantum Well Waveguide Structures, Poster presented at 5th International Conference on Mid-Infrared Optoelectronic Materials and Devices (MIOMD-V), Annapolis, Maryland, 8th-11th September 2002.

K. T. Lai, S. K. Haywood, R. Gupta and M. Missous, Enhanced Intersubband Absorption in Stepped Double Barrier Quantum Well Waveguide Structures, presented at the 6th Mid-Infrared Network Meeting, Imperial College, London, UK, 9th July 2002.

K. T. Lai, S. K. Haywood, R. Gupta and M. Missous, Enhanced n=1 to n=2 Intersubband Absorption in a Stepped Double Barrier Quantum Well, presented at the 5th Mid-Infrared Network Meeting, Heriot-Watt University, Edinburgh, UK, 7th December 2001.

K. T. Lai, S. K. Haywood, R. Gupta, K. Gooljar, M. Missous and A. J. Stead, Quantum Well Intersubband Photodetectors for Gas Sensing Applications, presented at the 4th Mid-Infrared Network Meeting, University of Surrey, UK, 5th July 2001.

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