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 , show that the optical output power of 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.
Laterally pumped GaAs/AlGaAs quantum wells as sources of broadband terahertz radiation
Reeno Reeder, Zoran Ikonić, Paul Harrison, Andres Udal, Enn Velmre; Laterally pumped GaAs/AlGaAs quantum wells as sources of broadband terahertz radiation. J. Appl. Phys. 1 October 2007; 102 (7): 073715. https://doi.org/10.1063/1.2783779
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