Realization of manipulating acoustic surface waves radiation direction with rectangular-groove structure
Realization of manipulating acoustic surface waves radiation direction with rectangular-groove structure
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DOI：
10.1063/1.4997716
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发表时间：
2017-11
期刊：
影响因子：
1.6
通讯作者：
J. Cui;Jie-hui Liu;Y. Mao;Yifeng Li;Xiaozhou Liu
中科院分区：
文献类型：
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作者：
J. Cui;Jie-hui Liu;Y. Mao;Yifeng Li;Xiaozhou Liu
声表面波(ASW)可以通过一维沟槽阵列产生。声音可以由ASW准直。然而，在以往的研究中，沟槽周期和栅周期一直是相同的。在这项工作中，我们提出了一种槽周期与栅周期不同的结构，并以非常小的旁瓣准直声波。该结构通过操纵声表面波来改变声波的辐射方向，并研究了不同沟槽深度下声辐射方向与频率的关系。此外，还可以通过改变矩形光栅的周期来控制声波的入射方向，从而可以耦合到ASW中。通过波数分析，从理论上阐明了控制ASW辐射方向的物理机制。这些理论预测通过数值模拟得到了验证。利用这种结构，我们可以控制ASW的辐射方向，这对实际应用是非常重要的。
Acoustic surface waves (ASWs) can be generated through a one-dimensional array of grooves. Sound can be collimated by ASWs. However, in previous studies, the groove period and grating period have been the same. In this work, we propose a structure where the groove period is different from the grating period, and collimates sound waves with very small side lobes. The structure can alter the acoustic wave radiation direction by manipulating ASWs and the relationship between the radiation direction and the frequency for different groove depths are investigated. Furthermore the incident direction of the sound wave, which can be coupled into ASWs, can be manipulated by changing the period of rectangular grating. We theoretically illustrate the physical mechanism of controlling the ASW radiation direction by wave-number analysis. These theoretical predictions are verified using numerical simulations. Using this proposed structure, we can manipulate the ASW radiation direction, which is very important for practi...