Broadband and high-efficiency circular polarizer based on planar-helix chiral metamaterials
Date of Issue2017
School of Electrical and Electronic Engineering
We reveal a broadband and high-efficiency circular polarizer based on chiral metamaterials composed of an array of planar helices, which can effectively reject the incident left-hand circularly polarized (LCP) wave, while allowing the right-hand circularly polarized (RCP) wave to pass through it. The physical mechanism of the proposed circular polarizer is explained with the aid of the current distributions under the excitations of LCP and RCP waves. Microwave experiments are performed to verify this idea, and measured results are in good agreement with the numerical ones. Experimental results show that a fractional bandwidth of 75.6% for the transmittance of the LCP wave lower than 0.2 can be obtained. Moreover, the proposed circular polarizer exhibits a high transmittance of over 0.9 for the RCP incident wave and a high circular polarization selection efficiency of over 0.95. The proposed circular polarizer will be potentially very useful for satellite and optical communications.
Applied Physics Letters
© 2017 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4990142]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.