Silicon-based light absorbers with unique polarization-adjusting effects

Abstract

We propose and demonstrate a silicon-based absorber platform, which can show three different kinds of polarization-adjusting behaviors under certain structural features. First, perfectly polarization-dependant absorption is observed when the rings are packed with a relatively large gap distance. The classical Malus law is reproduced by the absorption spectra via this asymmetrical system. Then, the polarization-adjusting response can be strongly weakened when the dimer rings are physically contacted with each other, suggesting a polarization-independent absorption. Third, partially matched polarization-manipulation absorption can be further achieved when the absorber is formed by closely packed rings dimer. These findings show remarkable different behaviors to that of the conventional metallic plasmons, introducing impressive insight on the polarization manipulation behaviors of the high-index dielectric resonators, metamaterials and metasurface.