In this paper, an acoustic metasurface design is presented in which the transmitted phase may be tuned while preserving a high amplitude of transmission. To achieve full transmission with an arbitrary phase, the cavity is coupled with the coiling metamaterial to provide the desired level of impedance match. Furthermore, the effects of its geometrical parameters are investigated. The proposed structure exhibits an appropriate phase modulation in the desired phase frame (i.e., [0, 2π]) with high amounts of amplitudes. It is shown that this can be obtained by precisely designing the geometrical parameters even when the key parameters (i.e., the number of unit cells and their width and thickness values) are constant. Ultimately, three metasurfaces have been designed to redirect, split, and focus the transmitted wave while the resulted wavefront amplitude is preserved, enabling an efficient modulation platform.

中文翻译：

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基于非中心腔的声学超表面：启用全相位调制

在本文中，提出了一种声学超表面设计，其中可以在保持高传输振幅的同时调整传输相位。为了实现任意相位的完全传输，空腔与线圈超材料耦合以提供所需的阻抗匹配水平。此外，研究了其几何参数的影响。所提出的结构在期望的相位帧中表现出适当的相位调制（即[ 0，2π]）的振幅。结果表明，即使关键参数（即晶胞数量及其宽度和厚度值）恒定，也可以通过精确设计几何参数来实现。最终，已设计了三个超表面来重定向，分割和聚焦传输的波，同时保留了产生的波前振幅，从而实现了高效的调制平台。