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Electron transport and terahertz gain in quantum-dot cascades

Vukmirovic, N., Indjin, D., Ikonic, Z. and Harrison, P. (2008) Electron transport and terahertz gain in quantum-dot cascades. IEEE Photonics Technology Letters, 20 (2). pp. 129-131. ISSN 10411135

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Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.

Item Type: Article
Copyright, Publisher and Additional Information: © Copyright 2008 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.
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: Repository Officer
Date Deposited: 10 Mar 2009 17:06
Last Modified: 08 Jun 2014 13:21
Published Version: http://dx.doi.org/10.1109/LPT.2007.912533
Status: Published
Publisher: IEEE
Refereed: Yes
Identification Number: 10.1109/LPT.2007.912533
URI: http://eprints.whiterose.ac.uk/id/eprint/7968

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