Stark ladders as tunable far-infrared emitters

Donovan, K., Harrison, P. and Kelsall, R.W. (1998) Stark ladders as tunable far-infrared emitters. Journal of Applied Physics, 84 (9). pp. 5175-5179. ISSN 1089-7550

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Abstract

A superlattice of GaAs/Ga(1 – x)Al(x)As quantum wells forms a Stark ladder under the influence of a perpendicular electric field. A two level incoherent emitter system, formed by radiative intersubband transitions between adjacent wells, is investigated as a tunable far-infrared radiation source. Intersubband transition rates are calculated at 4, 77, and 300 K for applied fields from 0 to 40 kV cm(–1). It is shown that the quantum efficiency of the radiative emission reaches a maximum at low temperatures for a field of 32 kV cm(–1). Under these conditions the emission wavelength is 38 µm with an estimated power output of 1.1 mW. © 1998 American Institute of Physics.

Item Type:	Article
Copyright, Publisher and Additional Information:	Copyright © 1998 American Institute of Physics. Reproduced in accordance with the publisher's self-archiving policy. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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:	01 Nov 2006
Last Modified:	08 Feb 2013 17:02
Published Version:	http://dx.doi.org/10.1063/1.368810
Status:	Published
Publisher:	American Institute of Physics
Refereed:	Yes
Identification Number:	10.1063/1.368810
URI:	http://eprints.whiterose.ac.uk/id/eprint/1680

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