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

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作者：
Reeder, Reeno [1 ]
Ikonić, Zoran [2 ]
Harrison, Paul [2 ]
Udal, Andres [1 ]
Velmre, Enn [1 ]
机构：
[1] Department of Electronics, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
[2] Institute of Microwaves and Photonics, School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
来源：
Journal of Applied Physics | 2007年 / 102卷 / 07期
关键词：
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. © 2007 American Institute of Physics;
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