Radovanovic, J., Milanovic, V., Ikonic, Z., Indjin, D., Jovanovic, V. and Harrison, P. (2003) Optimal design of GaN-AlGaN Bragg-confined structures for intersubband absorption in the near-infrared spectral range. IEEE Journal of Quantum Electronics, 39 (10). pp. 1297-1304. ISSN 0018-9197
Available under licence : See the attached licence file.
Method is proposed for the design and optimization of structural parameters of GaN-AlGaN Bragg-confined structures with respect, to peak intersubband absorption from the ground to the first excited state, 1 --> 2 electronic transition, in the near infrared spectral range. An,above-the-barrier bound state was used to extend the range of transition energies above the values available in conventional quantum wells. Intrinsic polarization fields and nonparabolicity effects were taken into account. The selection of optimal parameters, maximizing the absorption at wavelengths of 1.55 and 1.3 μm, was performed by using a simulated annealing algorithm, and optimal structures with infinite superlattices as confinement regions were thus designed. These optimal parameters were then used to set realistic, finite structures with a small number of layers, the performance of which was re-evaluated by solving the Schrodinger-Poisson equation self-consistently for a few different levels and profiles of doping.
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|Keywords:||Bragg-confined structures, GaN quantum wells, intersubband absorption|
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)|
|Depositing User:||Sherpa Assistant|
|Date Deposited:||10 Oct 2005|
|Last Modified:||04 Jun 2014 22:04|