High-performance and lightweight waterborne acoustic devices have provided important support for the development of ocean exploration, health monitoring, etc. In this work, we propose a high-efficiency ultrathin nonlocal waterborne acoustic metasurface. Due to strong nonlocal interaction between the waterborne unit cells induced by the fluid-solid interaction, a nonlocal design concept based on diffraction theory and the optimization approach is proposed to design waterborne acoustic metasurfaces, in contrast to the local design based on the generalized Snell’s law. The theoretical efficiency limitation of the generalized Snell’s law can be broken, and unitary efficiency could be obtained even for large-angle anomalous reflection. The high-efficiency modulation is achieved owing to the energy flow along the metasurface resulting from the nonlocal interaction. The thickness of the waterborne acoustic metasurface can be minimized to one tenth or even one sixtieth of the working wavelength. The nonlocal design with fluid-solid interaction paves the way for high-efficiency and deep-subwavelength waterborne acoustic wave manipulation.

中文翻译：

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高效超薄非局部水性声表面

高性能，轻便的水声设备为海洋勘探，健康监测等的发展提供了重要的支持。在这项工作中，我们提出了一种高效的超薄非局部水声超表面。由于流固耦合引起的水基单元之间强烈的非局部相互作用，与基于广义斯涅尔定律的局部设计相反，提出了一种基于衍射理论和优化方法的非局部设计概念来设计水声超表面。 。可以打破广义斯涅尔定律的理论效率极限，即使对于大角度异常反射也可以获得单位效率。由于非局部相互作用导致沿超表面的能量流动，从而实现了高效调制。水性声学超表面的厚度可以最小化到工作波长的十分之一甚至六十分之一。具有流固耦合的非局部设计为高效和深亚波长水性声波操纵铺平了道路。