Imaging ripples on phononic crystals reveals acoustic band structure and Bloch harmonics
Imaging ripples on phononic crystals reveals acoustic band structure and Bloch harmonics
复制标题
DOI：
10.1103/physrevlett.97.055502
复制
发表时间：
2006-08-04
影响因子：
8.6
通讯作者：
Matsuda, O.
中科院分区：
文献类型：
--
作者：
Profunser, Dieter M.;Wright, Oliver B.;Matsuda, O.
用超快光学技术对由微结构线图案构成的声子晶体上的宽带表面声子波包进行了二维真实的实时跟踪。本征模分布和二维声学频带结构从时空傅立叶变换的数据高达1 GHz。我们发现阻带在区域边界的泄漏纵向和瑞利波，并显示如何在k空间中的单个声学本征模的结构取决于布洛赫谐波和模式耦合。
Broadband surface phonon wave packets on a phononic crystal made up of a microstructured line pattern are tracked in two dimensions and in real time with an ultrafast optical technique. The eigenmode distribution and the 2D acoustic band structure are obtained from spatiotemporal Fourier transforms of the data up to 1 GHz. We find stop bands at the zone boundaries for both leaky-longitudinal and Rayleigh waves, and show how the structure of individual acoustic eigenmodes in k space depends on Bloch harmonics and on mode coupling.