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Laterally pumped GaAs/AlGaAs quantum wells as sources of broadband terahertz radiation

Reeder, R., Ikonić, Z., Harrison, P., Udal, A. and Velmre, E. (2007) Laterally pumped GaAs/AlGaAs quantum wells as sources of broadband terahertz radiation. Journal of Applied Physics, 102 (073715). ISSN 1089-7550

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Abstract

In this work we consider lateral current pumped GaAs/AlGaAs quantum wells as sources of incoherent terahertz radiation. The lateral field heats the electrons in a two-dimensional quantum layer and increases the population of higher subbands, hence also increasing the radiation power generated in spontaneous intersubband emission processes. Digitally graded quasi-parabolic and simple square quantum wells are considered, and the advantages of both types are discussed. Calculations at lattice temperatures of 77 K and 300 K, for electric fields up to 10 kV/cm, show that the optical output power of ~100−200 W/m2 may be achieved for the 7 THz source. The main peak of the spectrum, at 7 THz, of the quasi-parabolic quantum well exceeds the black body radiation at 300 K by approximately a factor of two and by two orders of magnitude at 77 K.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2007 American Institute of Physics
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: 06 Nov 2007 11:02
Last Modified: 07 Jun 2014 02:15
Published Version: http://dx.doi.org/10.1063/1.2783779
Status: Published
Publisher: The American Institute of Physics
Identification Number: 10.1063/1.2783779
URI: http://eprints.whiterose.ac.uk/id/eprint/3450

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