Filtering of elastic waves by opal-based hypersonic crystal.
Filtering of elastic waves by opal-based hypersonic crystal.
复制标题
DOI：
10.1021/nl904126m
复制
发表时间：
2010-03
期刊：
影响因子：
10.8
通讯作者：
A. S. Salasyuk;A. Scherbakov;D. Yakovlev;A. Akimov;A. A. Kaplyanskii-A.;Saveliy F. Kaplan;S. A. Grudinkin;A. Nashchekin;A. Pevtsov;V. Golubev;T. Berstermann;C. Brüggemann;M. Bombeck;M. Bayer
中科院分区：
文献类型：
--
作者：
A. S. Salasyuk;A. Scherbakov;D. Yakovlev;A. Akimov;A. A. Kaplyanskii-A.;Saveliy F. Kaplan;S. A. Grudinkin;A. Nashchekin;A. Pevtsov;V. Golubev;T. Berstermann;C. Brüggemann;M. Bombeck;M. Bayer
我们报告了在10 GHz范围内使用高质量硅蛋白石薄膜作为三维高超声速晶体的实验。这些结构的可控烧结导致亚微米大小的硅球之间形成明确的弹性键合，从而形成弹性波的带状结构。用飞秒激光注入宽频带弹性波包，研究了声波晶体的特性。根据弹性键合强度的不同，能带结构将具有完整带隙频率的长寿命表面声波与具有传播到晶体中导致快速衰减的带频率的体波分开。
We report experiments in which high quality silica opal films are used as three-dimensional hypersonic crystals in the 10 GHz range. Controlled sintering of these structures leads to well-defined elastic bonding between the submicrometer-sized silica spheres, due to which a band structure for elastic waves is formed. The sonic crystal properties are studied by injection of a broadband elastic wave packet with a femtosecond laser. Depending on the elastic bonding strength, the band structure separates long-living surface acoustic waves with frequencies in the complete band gap from bulk waves with band frequencies that propagate into the crystal leading to a fast decay.