Multifunctional anisotropic coding metasurface with low emissivity and high optical transmittance

Abstract With the advancement of theoretical research and the broadening of practical applications, metasurfaces have produced peculiar phenomena that traditional materials cannot achieve by virtue of their powerful electromagnetic wave manipulation capabilities. In order to realize the manipulation of multispectral electromagnetic waves, this paper designs anisotropic indium-tin-oxide (ITO) controlled-duty-cycle metasurface units and then combines them into a specific sequence, and realizes different responses to microwaves incident with different polarizations. In addition, the-controlled-duty-cycle ITO makes the emissivity of the entire structure designed to be only 0.3. The constituent materials of the metasurface units are transparent ITO, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), which makes the entire structure optically transparent. The phenomena observed after the experiment in the laboratory is consistent with the abnormal reflection of microwaves simulated in the software. The obtained infrared emissivity data is basically equal to the value calculated in the theoretical analysis. This paper also describes the experimental measurement results, which correspond with the prediction, of the visible light transmittance of the structure.