Singular Graphene Metasurfaces

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Title: Singular Graphene Metasurfaces
Authors: Galiffi, E
Pendry, J
Arroyo Huidobro, P
Item Type: Journal Article
Abstract: The spatial tunability of the electron density in graphene enables the dynamic engineering of metasurfaces in the form of conductivity gratings, which can bridge the momentum gap between incident radiation and surface plasmons. Here, we discuss singular graphene metasurfaces, whose conductivity is strongly suppressed at the grating valleys. By analytically characterising their plasmonic response via transformation optics, we first review the physical principles underlying these structures, which were recently found to exhibit broadband, tunable THz absorption. We characterise the spectrum with different common substrates and then move to study in further detail how conductivity gratings may be finely tuned by placing an array of charged gold nanowires at sub-micron distance from the graphene.
Issue Date: 22-Feb-2019
Date of Acceptance: 11-Jan-2019
URI: http://hdl.handle.net/10044/1/67100
DOI: https://dx.doi.org/10.1051/epjam/2019005
ISSN: 2272-2394
Publisher: EDP Open
Journal / Book Title: EPJ Applied Metamaterials
Volume: 6
Copyright Statement: © 2019 E. Galiffi et al., published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Gordon and Betty Moore Foundation
ESPRC
Funder's Grant Number: EP/L024926/1
00009581
ESPRC (EP/G036888/1)
Publication Status: Published
Article Number: 10
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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