Subwavelength asymmetric transmission device for underwater acoustic waves with multiple incident directions
Subwavelength asymmetric transmission device for underwater acoustic waves with multiple incident directions
复制标题
多入射方向水下声波亚波长非对称传输装置
DOI：
10.1088/1361-6463/ab1b06
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发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Zhang Yu
中科院分区：
文献类型：
--
作者：
Zhang Sai;Zhang Yan;Lu Wei;Xu Baiqiang;Zhang Yu
非对称声传输器件对入射波即入射方向和波长的限制较小，是其未来发展的必然趋势。在这项研究中，我们揭示了多个入射方向的水声的亚波长非对称传输的机制，该系统由级联的固液超晶格和浸入水中的声栅(AG)组成。理论分析和数值模拟表明，对于多个入射方向的负入射，声波几乎全反射，而对于正入射，声波具有较高的透射率。此外，我们的设计可以在非常宽的带宽内工作，并且在亚波长区具有保存的波形。这一独特的特性归因于级联结构的超宽禁带传输，以及AG在低频下的衍射效应。我们的设计具有良好的亚波长性能，在水下通信和信号传输中具有潜在的实际应用价值。
Asymmetric acoustic transmission devices with less restrictions on incident waves, i.e. incident direction and wavelength, are an inevitable trend of its future development. In this study, we reveal the mechanism for the subwavelength asymmetric transmission for underwater sound with multiple incident directions in an assembly system, constituting of a cascade solid-fluid superlattice coupled with an acoustic grating (AG) immersed in water. Theoretical analysis and numerical simulations verified that acoustic waves are almost totally reflected for negative incidence with multiple incident directions, while having a high transmission for positive cases. Moreover, our design can work within a remarkable broad bandwidth and possesses a preserved waveform in the subwavelength region. The unique feature is attributed to the extraordinary ultra-wide forbidden transmission of the cascade structure, as well as the diffraction effect of AG at low frequencies. The perfect subwavelength performance of our design suggests its potential practical application in underwater communication and signal transmission.
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