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

By R. Reeder, Z. Ikonić, P. Harrison, A. Udal and E. Velmre

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

Publisher: The American Institute of Physics
Year: 2007
OAI identifier: oai:eprints.whiterose.ac.uk:3450

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