Coherent acoustic phonons in phonon cavities investigated by asynchronous optical sampling

被引：4

作者：

Hudert, F. ^{[1
]}

Bartels, A. ^{[1
]}

Janke, C. ^{[1
]}

Dekorsy, T. ^{[1
]}

Koehler, K. ^{[2
]}

机构：

[1] Univ Konstanz, D-78464 Constance, Germany

[2] Fraunhofer Inst Appl Solid State Phys, Freiberg, Germany

来源：

12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (PHONONS 2007) | 2007年 / 92卷

关键词：

D O I：

10.1088/1742-6596/92/1/012012

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Using a recently introduced measurement technique, called asynchronous optical sampling (ASOPS), we have investigated the dynamics of coherent acoustic phonons in a semiconductor heterostructure composed of a GaAs film between two GaAs/AlAs superlattices, serving as a cavity for acoustic phonons. Measurements were performed at liquid helium temperatures. The possibility to perform two-color pump-probe spectroscopy allowed us to tune the probe pulse energy to the cavity band gap, while sweeping the pump pulse energy over the superlattice resonance. The large measurement window of 1 ns in combination with a resolution of about 150 fs made a detailed analysis of the observed phonon dynamics possible. We observed a long lived oscillation in the gap of the phonon dispersion at 466 GHz, which we attribute to a cavity mode.

引用

页数：4

共 14 条

[1] Ultrafast time-domain spectroscopy based on high-speed asynchronous optical sampling [J].