Tunable broadband terahertz polarizer using graphene-metal hybrid metasurface

Abstract

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.

Metadata

Item Type:	Article
Authors/Creators:	Meng, K Park, SJ https://orcid.org/0000-0001-8606-191X Li, LH Bacon, DR Chen, L Chae, K Park, JY Burnett, AD https://orcid.org/0000-0003-2175-1893 Linfield, EH Davies, AG https://orcid.org/0000-0002-1987-4846 Cunningham, JE https://orcid.org/0000-0002-1805-9743
Copyright, Publisher and Additional Information:	Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Accepted: 14 October 2019 Published (online): 4 November 2019 Published: 11 November 2019
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds)
Funding Information:	Funder Grant number EPSRC EP/R00501X/1 EPSRC EP/P021859/1 EPSRC EP/P007449/1
Depositing User:	Symplectic Publications
Date Deposited:	17 Oct 2019 11:09
Last Modified:	17 Dec 2024 15:01
Status:	Published
Publisher:	Optical Society of America
Identification Number:	10.1364/OE.27.033768
Related URLs:	Dataset
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:152190