利用结构声表面波实现声波的准直发射
ollimation of sound supported by designer surface acoustic waves
周期性刻槽的刚体表面可以支持一种被称作结构声表面波的表面模式，在低频段，这种声表面波处于局域态。通过引入大周期栅结构的二次调制，声表面波可以由局域态转变为辐射态，当其与外界入射波耦合时，能够得到远场准直波束。实验测量和理论模拟都表明，利用这一结构，可以实现较好的声波准直效应。
he rigid surface modulated with period arrays of subwavelength grooves can support highly confined surface states, which are now called designer surface acoustic waves (DSAWs). At low frequency, the surface waves are nonleaky. By introducing an extra larger-period array of narrow ridges into the original structured plate, the surface waves turn leaky.The interference of the surface waves and the waves diffusing from the source results in a collimated beam.Both experimental and simulated results show obvious collimation of sound.
叶扬韬、柯满竹、贾晗
声学工程
声学周期结构准直效应声表面波
acousticsperiodic structurecollimationsurface acoustic waves
叶扬韬,柯满竹,贾晗.利用结构声表面波实现声波的准直发射[EB/OL].(2013-01-05)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201301-168.点此复制
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