We propose the design of an ultrathin planar acoustic metasurface with wavelength-dependent manipulation of a reflected wave. The metasurface comprises meta-atoms composed of multiple resonant elements working collectively to produce desired phase responses at different frequencies. We numerically demonstrate the performance of the proposed device via distinctive examples of achromatic acoustic convergence, and production of anomalous reflection, sound focusing and diffuse reflection at three prescribed frequencies. Our design opens an avenue to novel multi-functional acoustic devices and may find applications in diverse practical scenarios requiring independent wavefront manipulation at different frequencies such as information multiplexing/demultiplexing and architectural acoustics.

中文翻译：

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反射声波的波长相关多功能波前处理

我们提出了一种超薄平面声超表面的设计，该平面具有反射波的波长相关操纵。超颖表面包括由多个共振元件组成的超原子，这些共振元件共同工作以在不同频率下产生所需的相位响应。我们通过消色差声学会聚的独特示例，以及在三个指定频率处产生异常反射，声音聚焦和漫反射的数值示例，来数值演示所提出的设备的性能。我们的设计为新型多功能声学设备开辟了道路，并可能在需要在不同频率下进行独立波前操纵的各种实际场景中找到应用，例如信息复用/解复用和建筑声学。