Exciting pseudospin-dependent edge states in plasmonic metasurfaces
File(s)
Author(s)
Proctor, M
Craster, RV
Maier, SA
Giannini, V
Huidobro, PA
Type
Journal Article
Abstract
We study a plasmonic metasurface that supports pseudospin-dependent edge states confined at a subwavelength scale, considering full electrodynamic interactions including retardation and radiative effects. The spatial symmetry of the lattice of plasmonic nanoparticles gives rise to edge states with properties reminiscent of the quantum spin Hall effect in topological insulators. However, unlike the spin-momentum locking characteristic of topological insulators, these modes are not purely unidirectional and their propagation properties can be understood by analyzing the spin angular momentum of the electromagnetic field, which is inhomogeneous in the plane of the lattice. The local sign of the spin angular momentum determines the propagation direction of the mode under a near-field excitation source. We also study the optical response under far-field excitation and discuss in detail the effects of radiation and retardation.
Date Issued
2019-11-01
Online Publication Date
2021-06-11T14:06:02Z
Date Acceptance
2019-10-07
ISSN
2330-4022
Publisher
American Chemical Society
Start Page
2985
End Page
2995
Journal / Book Title
ACS Photonics
Volume
6
Issue
11
Copyright Statement
© 2019 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsphotonics.9b01192
Sponsor
The Leverhulme Trust
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000499742000046&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
RPG-2016-365
EP/L024926/1
Subjects
Science & Technology
Technology
Physical Sciences
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Optics
Physics, Applied
Physics, Condensed Matter
Science & Technology - Other Topics
Materials Science
Physics
plasmonics
metasurface
nanoparticle array
topological photonics
edge states
pseudospin
CHAINS
MODES
Science & Technology
Technology
Physical Sciences
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Optics
Physics, Applied
Physics, Condensed Matter
Science & Technology - Other Topics
Materials Science
Physics
plasmonics
metasurface
nanoparticle array
topological photonics
edge states
pseudospin
CHAINS
MODES
0205 Optical Physics
0206 Quantum Physics
0906 Electrical and Electronic Engineering
Publication Status
Published
Date Publish Online
2019-10-07