A novel resonator-based metasurface is devised to control reflected underwater waves. Each metasurface unit is constructed with an aluminum plate attached to a lead mass. By tailoring the thickness of the plate, full 2π phase shift of the reflected wave can be achieved. Examples of redirection, focusing, and directional carpet cloaking are demonstrated as applications. The target frequency can be as low as 500 Hz and it can operate in a broadband range. Slight modifications allow the design to perform excellently from tens to thousands of hertz. This metasurface provides a new design paradigm when there is a need to manipulate low frequency underwater waves, such as in submarines for stealth operation or detection-signal manipulation to provide deceptive information.

中文翻译：

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用于低频水声波的基于谐振器的反射超表面

设计了一种新型的基于谐振器的超表面来控制反射的水下波。每个超表面单元都由连接到铅块的铝板构成。通过调整板的厚度，可以实现反射波的全 2π 相移。重定向、聚焦和定向地毯隐形的示例作为应用程序进行了演示。目标频率可低至 500 Hz，并可在宽带范围内运行。轻微的修改使设计能够在数万赫兹到数千赫兹范围内表现出色。当需要操纵低频水下波时，这种超表面提供了一种新的设计范例，例如在潜艇中进行隐身操作或操纵探测信号以提供欺骗性信息。