title: Compact bandwidth-tunable polarization filter based on a plasmonic heterograting.
abstract: A plasmonic heterograting device, consisting of two juxtaposed parallel gratings with different periods, is demonstrated to function as a compact bandwidth-tunable polarization filter. The essential aspect of the structure is that the grating couples into a photonic mode of the substrate. Using this device, a linearly polarized spectrum can be conveniently and selectively picked out from nonpolarized white light. The bandwidth depends on the incident angle and the overlap of the first-order diffraction spectra of the two different grating, and can be freely narrowed. The tuning characteristics of the heterograting are investigated both theoretically and experimentally. The unique physical features potentially enable the development of new polarization elements and optical devices.
authors.affiliation: Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yuanhai
authors.initials: Y
authors.lastname: Lin
authors.forename: Tianrui
authors.initials: T
authors.lastname: Zhai
authors.forename: Qianli
authors.initials: Q
authors.lastname: Ma
authors.forename: Hongmei
authors.initials: H
authors.lastname: Liu
authors.forename: Xinping
authors.initials: X
authors.lastname: Zhang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*