Near- and far-field excitation of topological plasmonic metasurfaces
File(s)photonics-07-00081-v2.pdf (10.2 MB)
Published version
OA Location
Author(s)
Type
Journal Article
Abstract
The breathing honeycomb lattice hosts a topologically non-trivial bulk phase due to the crystalline-symmetry of the system. Pseudospin-dependent edge states, which emerge at the interface between trivial and non-trivial regions, can be used for the directional propagation of energy. Using the plasmonic metasurface as an example system, we probe these states in the near- and far-field using a semi-analytical model. We provide the conditions under which directionality was observed and show that it is source position dependent. By probing with circularly-polarised magnetic dipoles out of the plane, we first characterise modes along the interface in terms of the enhancement of source emissions due to the metasurface. We then excite from the far-field with non-zero orbital angular momentum beams. The position-dependent directionality holds true for all classical wave systems with a breathing honeycomb lattice. Our results show that a metasurfac,e in combination with a chiral two-dimensional material, could be used to guide light effectively on the nanoscale.
Date Issued
2020-09-24
Date Acceptance
2020-09-20
Citation
Photonics, 2020, 7 (4)
ISSN
2304-6732
Publisher
MDPI
Journal / Book Title
Photonics
Volume
7
Issue
4
Copyright Statement
©2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open accessarticle distributed under the terms and conditions of the Creative Commons Attribution(CC BY) license (http://creativecommons.org/licenses/by/4.0/).
License URL
Sponsor
The Leverhulme Trust
Grant Number
RF-2017-017/9
Subjects
Science & Technology
Physical Sciences
Optics
topological nanophotonics
plasmonic metasurface
edge states
pseudospin
chiral
VALLEY EXCITONS
PARTICLES
RANGE
MODES
Publication Status
Published
Article Number
ARTN 81
Date Publish Online
2020-09-24