Tunable broadband terahertz polarizer using graphene-metal hybrid metasurface

• DOI: 10.1364/oe.27.033768
• Publication Date: 2019-11-04T16:20:31Z
• Authors: K. Meng; S. J. Park; L. H. Li; D. R. Bacon; L. Chen; K. Chae; J. Y. Park; A. D. Burnett; E. H. Linfield; A. G. Davies; J. E. Cunningham
• Keywords: Polarizer; Drude model

We demonstrate an electrically tunable polarizer for terahertz (THz) frequency electromagnetic waves formed from a hybrid graphene-metal metasurface. Broadband (>3 THz) polarization-dependent modulation of THz transmission is demonstrated as function the graphene conductivity various wire grid geometries, each tuned by gating using overlaid ion gel. show strong enhancement (up to ∼17 times) compared grids in range 0.2-2.5 upon introduction metallic elements. Theoretical calculations, considering both plasmonic coupling and Drude absorption, are good agreement with our experimental findings.