Coherent acoustic phonons in nanostructures

被引：0

作者：

Dekorsy, T. ^{[1
]}

Taubert, R. ^{[1
]}

Hudert, F. ^{[1
]}

Bartels, A. ^{[1
]}

Habenicht, A. ^{[1
]}

Merkt, F. ^{[1
]}

Leiderer, P. ^{[1
]}

Koehler, K. ^{[2
]}

Schmitz, J. ^{[2
]}

Wagne, J. ^{[2
]}

机构：

[1] Univ Konstanz, Ctr Appl Photon, Dept Phys, D-78457 Constance, Germany

[2] Fraunhofer Inst Appl Solid State Phys, D-79108 Freiburg, Germany

来源：

ULTRAFAST PHENOMENA IN SEMICONDUCTORS AND NANOSTRUCTURE MATERIALS XII | 2008年 / 6892卷

关键词：

femtosecond spectroscopy; coherent phonons; asynchronous optical sampling; picosecond ultrasonics; metallic nanoparticles; nanomechanical systems;

D O I：

10.1117/12.760395

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页数：8

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