High-efficiency polarization converter with near-unity transmittance in the visible wavelength based on all dielectric rod metasurface array

Abstract

Owing to the unique electromagnetic properties, metasurface is able to achieve arbitrary polarization status by planning the shape of the meta-atoms in one unit. Compared to conventional waveplates, due to the compact size of the metasurface based devices, polarization converters with high conversion efficiency have great potential in integrated photonics. In this paper, we present a transmissive polarization converter working in the visible wavelength region which is composed of GaN rectangular rod metasurface array placed on a glass substrate. The metasurface structure exhibits a polarization conversion ratio exceeding 0.8 within the wavelength range of 477-538 nm, and achieves nearly 100% conversion efficiency for linearly polarized light at 503 nm. The transmittance is larger than 0.8 in the identical wavelength range and the highest transmittance of 0.98 is achieved at 503 nm.