title: Higher extinction ratio circular polarizers with hetero-structured double-helical metamaterials.
abstract: We have recently shown circular polarizers with the homo-structured double-helical metamaterials, which have broader operation bands than those of the single-helical structures [Opt. Lett. 35, 2588 (2010)]. However, trying to get more operation bands deteriorates the extinction ratio. In this paper, we proposed circular polarizers with hetero-structured double-helical metamaterials. The extinction ratios of these circular polarizers are two times higher than those with homo-structured double-helical metamaterials. Furthermore, we qualitatively explained the phenomenon of the higher extinction ratio from the viewpoint of the interaction between the two helix-wires in a double-helical unit.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hube 430074, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Yang
authors.forename: Shengxi
authors.initials: S
authors.lastname: Li
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao