Abstract

Conventional microwave metasurfaces are usually composed of copper/dielectric inclusions which are opaque in visible frequencies. Here, metasurfaces with optical transparency is proposed to control either the backward scattering or the absorption in microwave region. We have designed a flexible coding metasurface for reducing the backward scattering with at least 10 dB from 7.8 to 15 GHz. By using lossy optically transparent film, we have also optimized a broadband microwave absorber with subwavelength thickness. These proposals offer new opportunities for manipulating the microwave scattering and absorption with simultaneously high optical transparency, which may provide benefits in real-world uses, for example, window and solar panel applications.

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