Anisotropic Meta-Mirror for Achromatic Electromagnetic Polarization Manipulation
journal contributionposted on 01.04.2013, 00:00 authored by M. Pu, Po Chen, Y. Wang, Z. Zhao, C. Huang, C. Wang, X. Ma, X. Luo
Polarization states are of particular importance for the manipulation of electromagnetic waves. Here, we proposed the design and experimental demonstration of anisotropic meta-mirror for achromatic polarization tuning. It is demonstrated that linear polarized wave can be achromatically transformed to its cross-polarization state or to arbitrary circular polarization after its reflection from the mirror. Microwave experiments verified that the fraction bandwidth for 90 transformation efficiency can be larger than 3:1. Furthermore, by utilizing photoinduced carrier generation in silicon, a broadband tunable circular polarizer is demonstrated in the terahertz regime.