Imaging acoustic waves in microscopic wedges
Imaging acoustic waves in microscopic wedges
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DOI：
10.1088/1367-2630/16/10/103029
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发表时间：
2014-10
影响因子：
3.3
通讯作者：
M. Tomoda;Shinnosuke Matsueda;P. Otsuka;O. Matsuda;I. Veres;V. Gusev;O. Wright
中科院分区：
文献类型：
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作者：
M. Tomoda;Shinnosuke Matsueda;P. Otsuka;O. Matsuda;I. Veres;V. Gusev;O. Wright
使用超快光学技术，我们的图像近千兆赫弯曲声波在薄金楔上沉积的氮化硅片传播。二维成像数据的时间傅立叶变换允许访问各个频率。与反对称兰姆波相关的波阵面朝向楔形体的薄端弯曲。这种行为是模仿与分析模型的基础上的部分线性楔形。我们还进行了数值模拟，显示出良好的协议与实验结果。
Using an ultrafast optical technique we image near-gigahertz flexural acoustic waves propagating in a thin gold wedge deposited on an ultrathin silicon nitride slab. Temporal Fourier transforms of the imaged data in two dimensions allow individual frequencies to be accessed. The wave fronts associated with antisymmetric Lamb waves bend towards the thin end of the wedge. This behaviour is mimicked with an analytical model based on sections of a linear wedge. We also conduct numerical simulations which show good agreement with the experimental results.