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Proceedings Paper

Coherent acoustic phonons in nanostructures
Author(s): T. Dekorsy; R. Taubert; F. Hudert; A. Bartels; A. Habenicht; F. Merkt; P. Leiderer; K. Köhler; J. Schmitz; J. Wagner
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Paper Abstract

Phonons are considered as a most important origin of scattering and dissipation for electronic coherence in nanostructures. The generation of coherent acoustic phonons with femtosecond laser pulses opens the possibility to control phonon dynamics in amplitude and phase. We demonstrate a new experimental technique based on two synchronized femtosecond lasers with GHz repetition rate to study the dynamics of coherently generated acoustic phonons in semiconductor heterostructures with high sensitivity. High-speed synchronous optical sampling (ASOPS) enables to scan a time-delay of 1 ns with 100 fs time resolution with a frequency in the kHz range without a moving part in the set-up. We investigate the dynamics of coherent zone-folded acoustic phonons in semiconductor superlattices (GaAs/AlAs and GaSb/InAs) and of coherent vibration of metallic nanostructures of non-spherical shape using ASOPS.

Paper Details

Date Published: 14 February 2008
PDF: 8 pages
Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68920E (14 February 2008); doi: 10.1117/12.760395
Show Author Affiliations
T. Dekorsy, Univ. Konstanz (Germany)
R. Taubert, Univ. Konstanz (Germany)
F. Hudert, Univ. Konstanz (Germany)
A. Bartels, Univ. Konstanz (Germany)
A. Habenicht, Univ. Konstanz (Germany)
F. Merkt, Univ. Konstanz (Germany)
P. Leiderer, Univ. Konstanz (Germany)
K. Köhler, Fraunhofer Institute für Angewandte Festkörperphysik (Germany)
J. Schmitz, Fraunhofer Institute für Angewandte Festkörperphysik (Germany)
J. Wagner, Fraunhofer Institute für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 6892:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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