The topological plasmonic chain with retardation and radiative effects

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Title: The topological plasmonic chain with retardation and radiative effects
Authors: Pocock, SR
Xiao, X
Huidobro, PA
Giannini, V
Item Type: Journal Article
Abstract: We study a one-dimensional plasmonic system with nontrivial topology: a chain of metallic nanoparticles with alternating spacing, which in the limit of small particles is the plasmonic analogue to the Su-Schrieffer-Heeger model. Unlike prior studies we take into account long-range hopping with retardation and radiative damping, which is necessary for the scales commonly used in plasmonics experiments. This leads to a non-Hermitian Hamiltonian with frequency dependence that is notably not a perturbation of the quasistatic model. We show that the resulting band structures are significantly different, but that topological features such as quantized Zak phase and protected edge modes persist because the system has the same eigenmodes as a chirally symmetric system. We discover the existence of retardation-induced topological phase transitions, which are not predicted in the SSH model. We find parameters that lead to protected edge modes and confirm that they are highly robust under disorder, opening up the possibility of protected hotspots at topological interfaces that could have novel applications in nanophotonics.
Issue Date: 30-Apr-2018
Date of Acceptance: 30-Apr-2018
URI: http://hdl.handle.net/10044/1/59339
DOI: https://doi.org/10.1021/acsphotonics.8b00117
ISSN: 2330-4022
Publisher: American Chemical Society
Start Page: 2271
End Page: 2279
Journal / Book Title: ACS Photonics
Volume: 5
Issue: 6
Copyright Statement: © 2018 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License (v), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Sponsor/Funder: European Commission
Funder's Grant Number: 700745
Keywords: Science & Technology
Technology
Physical Sciences
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Optics
Physics, Applied
Physics, Condensed Matter
Science & Technology - Other Topics
Materials Science
Physics
plasmonics
surface plasmons
topological insulator
edge states
hotspots
disorder
nanoparticle array
NANOPARTICLE CHAINS
LINEAR-CHAINS
DISPERSION-RELATIONS
LIGHT-SCATTERING
ZIGZAG CHAINS
STATES
MODES
POLARITON
RESONANCES
PARTICLE
Publication Status: Published
Online Publication Date: 2018-04-30
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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