Generation and propagation of a picosecond acoustic pulse at a buried interface: Time-resolved X-ray diffraction measurements

被引：35

作者：

Lee, SH ^{[1
]}

Cavalieri, AL

Fritz, DM

Swan, MC

Hegde, RS

Reason, M

Goldman, RS

Reis, DA

机构：

[1] Univ Michigan, FOCUS Ctr, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.95.246104

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the propagation of coherent acoustic wave packets in (001) surface oriented Al0.3Ga0.7As/GaAs heterostructure, generated through localized femtosecond photoexcitation of the GaAs. Transient structural changes in both the substrate and film are measured with picosecond time-resolved x-ray diffraction. The data indicate an elastic response consisting of unipolar compression pulses of a few hundred picosecond duration traveling along [001] and [00 (1) over bar] directions that are produced by predominately impulsive stress. The transmission and reflection of the strain pulses are in agreement with an acoustic mismatch model of the heterostructure and free-space interfaces.

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页数：4

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