All-dielectric metasurface circular dichroism waveplate.

ABSTRACT: We propose and experimentally demonstrate a high efficient circularly polarizing dichroism waveplate (CPDW) using a Si-based all-dielectric 2Dchiral metasurface. We demonstrate that the CPDW exhibits a unique dichroism in that it functions as a transmissive quarter waveplate for one of either left-or right-handed circularly polarized incident lightand a reflective mirror for the opposite polarization. The circular polarization dichroism (CPD?=?I_RCP?-?I_LCP) in transmission at wavelength ~1.5??m reaches 97% and the extinction ratio (ER?=?I_RCP/I_LCP) is as high as 345:1. Experimental fabrications and measurements of the proposed all-dielectric metasurface are implemented and found to be in excellent agreement with the simulations. The proposed all-dielectric chiral metasurface is of advantages of high-dichroism, easy-fabrication and standard semiconductor fabrication techniques compatible, which could lead to enhanced security in fiber and free-space communications, as well as imaging and sensing applications for circularly polarized light with a highly integrated photonic platform.

SUBMITTER: Hu J 

PROVIDER: S-EPMC5282559 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature