Optically Transparent Diffusion Metasurface Using Metallic Mesh

In this paper, a novel optically transparent diffusion metasurface composed of 1-bit digital coding elements is presented. Two circular quasi-Minkowski closed-loops with different geometric scales are considered as 1-bit coding elements. The quasi-Minkowski closed-loops on the upper layer of the substrate and the back-ground on the lower layer are filled with tangential metallic ring mesh to improve the light transmittance. Low scattering is achieved by redirecting reflected EM energy to numerous directions forming a diffusion pattern through optimization of the arrangement of two coding elements. The low back-scattering characteristics with wide-angle and polarization independence below –10 dB of the diffusion metasurface are realized over a wide frequency band from 9 GHz to 16 GHz. The proposals provide new ways of manipulating the microwave scattering with simultaneously highly optical transparency in visible frequencies and demonstrate significant scientific value in practical applications.