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Optimal design of GaN-AlGaN Bragg-confined structures for intersubband absorption in the near-infrared spectral range

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

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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.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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
Published Version: http://dx.doi.org/10.1109/JQE.2003.817584
Status: Published
Refereed: Yes
Identification Number: 10.1109/JQE.2003.817584
URI: http://eprints.whiterose.ac.uk/id/eprint/711

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