Metasurfaces attract significant attention and are widely applied in modern communication systems due to their powerful capabilities to control the polarization, amplitude, and phase of electromagnetic waves. However, it is considerably challenging to control polarization and amplitude of incident waves for a passive metasurface. Specifically, we integrate the transmission and reflection functions by loading a middle layer with PIN diodes while the upper and lower structures are used to manipulate the polarizations of incident waves. As a proof of concept, we fabricate a sample having 18 × 18 meta-atoms. Beam deflectors for the circularly polarized waves dependent on Helicity are realized when the PIN diodes are turned off. A transmissive polarization converter for x -polarization and a reflective polarization keeper for y -polarization are achieved as the PIN diodes are turned on. More importantly, the functionalities exhibit extremely high efficiencies in the ra...

中文翻译：

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具有可控制的极化和反射/透射特性的可调谐超表面

超表面由于其强大的控制电磁波的极化，幅度和相位的能力而备受关注，并已广泛应用于现代通信系统中。然而，对于无源超颖表面而言，控制入射波的极化和幅度非常具有挑战性。具体来说，我们通过在中间层加载PIN二极管来集成传输和反射功能，而上下结构则用于操纵入射波的极化。作为概念证明，我们制造了一个具有18×18个亚原子的样品。当PIN二极管关闭时，实现了取决于Helicity的圆偏振波的光束偏转器。当PIN二极管导通时，实现了用于x偏振的透射偏振转换器和用于y偏振的反射偏振保持器。更重要的是，这些功能在实际应用中表现出极高的效率。