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Acoustic phonon generation and detection in GaAs/Al0.3Ga0.7As quantum wells with picosecond laser pulses

By O. Matsuda, T. Tachizaki, T. Fukui, J.J. Baumberg and O.B. Wright

Abstract

Picosecond acoustic-phonon pulse generation and detection is investigated in a sample containing three GaAs/Al0.3Ga0.7As quantum wells of different thickness with an interferometric optical pump and probe technique. The pump photon energy is tuned through the hh1-e1 transitions of each well and the probe photon energy is chosen to allow the detection of the phonon pulses at the sample surface. The phonon pulse shapes are explained with a model that relates the carrier wave functions to the acoustic strain, and the acoustic strain to the detected optical reflectance and phase changes

Topics: QC
Year: 2005
OAI identifier: oai:eprints.soton.ac.uk:15268
Provided by: e-Prints Soton

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