title: Ultrabroadband optical circular polarizers consisting of double-helical nanowire structures.
abstract: Recently, it was demonstrated by Gansel et al. [Science 325, 1513 (2009)] that 3D single-helical metamaterials can serve as broadband circular polarizers in the IR range. In this study, we propose a structured metamaterial with double-helical nanowires to construct circular polarizers with boarder wavelength bands in the visible-light and near-IR regions. Using the finite-difference time-domain method, we confirmed that the circular polarizers with the double-helical structures have operation bands more than 50% broader than those of the single-helical structures.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. zyang@mail.hust.edu.cn
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Yang
authors.forename: M
authors.initials: M
authors.lastname: Zhao
authors.forename: P X
authors.initials: PX
authors.lastname: Lu
authors.forename: Y F
authors.initials: YF
authors.lastname: Lu