Singular Graphene Metasurfaces
File(s)
Published version
Author(s)
Galiffi, Emanuele
Pendry, John
Arroyo Huidobro, Paloma
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.
Date Issued
2019-02-22
Date Acceptance
2019-01-11
Citation
EPJ Applied Metamaterials, 2019, 6
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.
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Gordon and Betty Moore Foundation
ESPRC
Grant Number
EP/L024926/1
00009581
ESPRC (EP/G036888/1)
Publication Status
Published
Article Number
10