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
Available under licence : See the attached licence file.
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.
|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|
|Publisher:||The American Institute of Physics|