Open AccessTunable broadband terahertz polarizer using graphene-metal hybrid metasurface
Author(s) -
Kun Meng,
S J Park,
L H Li,
David R. Bacon,
L Chen,
Kwanbyung Chae,
J Y Park,
Andrew Burnett,
E. H. Linfield,
A. G. Davies,
J. E. Cunningham
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.033768
Subject(s) - terahertz radiation , polarizer , graphene , materials science , optics , plasmon , optoelectronics , drude model , terahertz spectroscopy and technology , electromagnetic radiation , polarization (electrochemistry) , broadband , birefringence , physics , nanotechnology , chemistry
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 a function of the graphene conductivity for various wire grid geometries, each tuned by gating using an overlaid ion gel. We show a strong enhancement of modulation (up to ∼17 times) compared to graphene wire grids in the frequency range of 0.2-2.5 THz upon introduction of the metallic elements. Theoretical calculations, considering both plasmonic coupling and Drude absorption, are in good agreement with our experimental findings.