Non-reciprocal acoustic transmission via space-time modulated membranes
Non-reciprocal acoustic transmission via space-time modulated membranes
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DOI：
10.1063/1.5132699
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发表时间：
2020-01
影响因子：
4
通讯作者：
Xiaohui Zhu;Junfei Li;Chen Shen;Xiuyuan Peng;Ailing Song;Longqiu Li;S. Cummer
中科院分区：
文献类型：
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作者：
Xiaohui Zhu;Junfei Li;Chen Shen;Xiuyuan Peng;Ailing Song;Longqiu Li;S. Cummer
非互易性最近引起了相当大的关注，因为它为波浪操纵和控制带来了新的可能性。在这里，我们提出并从理论上和数值上分析了一个由两个膜组成的波导系统，其表面张力是通过它们之间的相位差进行时间调制的。通过该结构传输的波可以产生强非互易性和低插入损耗。开发了一种分析方法来计算系统中谐波的产生。基于这种方法，讨论了非互易波行为的双膜系统的优化设计。通过适当选择调制参数，相对两侧入射波的隔离度可达19.8dB，插入损耗仅为2.8dB，外形尺寸小于1/3波长。这些理论结果通过瞬态有限元模拟得到验证。我们的工作为设计声学不可逆装置提供了一种可行的方法。
Non-reciprocity has recently attracted considerable attention as it enables new possibilities in wave manipulation and control. Here, we propose and analyze theoretically and numerically a waveguide system consisting of two membranes whose surface tensions are time-modulated with a phase difference between them. Strong non-reciprocity and low insertion loss can result for waves transmitted through the structure. An analytic approach is developed to calculate the harmonics generation in the system. Based on this approach, the optimal design of a two-membrane system for non-reciprocal wave behavior is then discussed. By suitably choosing the modulation parameters, the isolation factor for waves incident from opposite sides can reach as high as 19.8 dB and an insertion loss of only 2.8 dB, with an overall dimension being less than 1/3 wavelength. These theoretical results are verified by time-dependent finite element simulations. Our work provides a feasible way to design acoustic non-reciprocal devices.