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Below-bandgap excited, terahertz emission of optically pumped GaAs/AlGaAs multiple quantum wells

Paper ID Volume ID Publish Year Pages File Format Full-Text
28333 44070 2006 4 PDF Available
Title
Below-bandgap excited, terahertz emission of optically pumped GaAs/AlGaAs multiple quantum wells
Abstract

We present terahertz (THz) emission of optically pumped 5-nm GaAs/AlGaAs multiple quantum wells (MQWs) even at excitation energies below the bandgap. The excitation energy corresponding to the peak THz emission is red-shifted with respect to the photoluminescence (PL) and photoluminescence excitation peak. This is attributed to a transient bandgap renormalization that occurs on the same time scale as the generation of the THz transients. Moreover, an emission shoulder at ∼40 meV below the THz emission peak was observed. Deep level transient spectroscopy results do not indicate that this is due to electron traps. However, an indistinct LO phonon-related, below-bandgap PL feature was seen at low temperature that coincides well with the observed THz radiation feature. It is proposed that the THz action spectrum may be sensitive to phonon-mediated processes in contrast to more conventional optical spectroscopy techniques, albeit at room temperature.

Keywords
Semiconductor; Terahertz radiation; Multiple quantum well; Longitudinal-optical (LO) phonon
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 183, Issue 3, 25 October 2006, Pages 334–337
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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