期刊
ULTRASONICS
卷 56, 期 -, 页码 148-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultras.2014.08.023
关键词
Phonon dispersion; Phonon backfolding; Time resolved Brillouin scattering; Superlattice; Broadband detection
资金
- Leibniz Graduate School DinL
We use broadband time domain Brillouin scattering to observe coherently generated phonon modes in bulk and nanolayered samples. We transform the measured transients into a frequency-wavevector diagram and compare the resulting dispersion relations to calculations. The detected oscillation amplitude depends on the occupation of phonon modes induced by the pump pulse. For nanolayered samples with an appropriately large period, the whole wavevector range of the Brillouin zone becomes observable by broadband optical light scattering. The backfolded modes vanish, when the excitation has passed the nanolayers and propagates through the substrate underneath. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据