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Picosecond acoustics in semiconductor quantum wells

Picosecond acoustics in semiconductor quantum wells
Picosecond acoustics in semiconductor quantum wells
Picosecond acoustic phonon pulses are generated with ultrashort laser pulses in a sample containing three GaAs-Al0.3Ga0.7As quantum wells of different thickness. The pump photon energy is tuned through the hh1-e1 transitions of each well (1.44 - 1.64 eV) and the probe photon energy is chosen to allow detection of the phonon pulses at the sample surface (3.06 eV). Transient optical reflectance and phase changes are recorded as a function of the delay time between the pump and probe light pulses using an interferometric technique. The transition between the valence and conduction sublevels of the wells is observed to strongly influence the pump-photon-energy dependence of the acoustic phonon pulse generation. The data are analyzed with a model that relates the carrier wavefunctions in the quantum wells to the acoustic strain through the deformation potential, and the acoustic strain to the transient optical reflectance and phase.
0277-786X
257-264
Matsuda, O.
db637c2a-8ee1-42d0-a24b-7afe03945570
Tachizaki, T.
9b7c624a-7739-4109-b087-d2d11f4c8d90
Fukui, T.
45e47270-70bd-44d7-aae2-c644df8df594
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Wright, O.B.
55c2f008-d20f-4716-9ca8-3ac1da0fed81
Matsuda, O.
db637c2a-8ee1-42d0-a24b-7afe03945570
Tachizaki, T.
9b7c624a-7739-4109-b087-d2d11f4c8d90
Fukui, T.
45e47270-70bd-44d7-aae2-c644df8df594
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Wright, O.B.
55c2f008-d20f-4716-9ca8-3ac1da0fed81

Matsuda, O., Tachizaki, T., Fukui, T., Baumberg, J.J. and Wright, O.B. (2005) Picosecond acoustics in semiconductor quantum wells. Proceedings of SPIE, 5725, 257-264. (doi:10.1117/12.584638).

Record type: Article

Abstract

Picosecond acoustic phonon pulses are generated with ultrashort laser pulses in a sample containing three GaAs-Al0.3Ga0.7As quantum wells of different thickness. The pump photon energy is tuned through the hh1-e1 transitions of each well (1.44 - 1.64 eV) and the probe photon energy is chosen to allow detection of the phonon pulses at the sample surface (3.06 eV). Transient optical reflectance and phase changes are recorded as a function of the delay time between the pump and probe light pulses using an interferometric technique. The transition between the valence and conduction sublevels of the wells is observed to strongly influence the pump-photon-energy dependence of the acoustic phonon pulse generation. The data are analyzed with a model that relates the carrier wavefunctions in the quantum wells to the acoustic strain through the deformation potential, and the acoustic strain to the transient optical reflectance and phase.

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Published date: 2005

Identifiers

Local EPrints ID: 57460
URI: http://eprints.soton.ac.uk/id/eprint/57460
ISSN: 0277-786X
PURE UUID: 159650c8-fd67-40b0-9f41-10bff061429a

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:34

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