Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27712
Title: Topological edge plasmon modes between diatomic chains of plasmonic nanoparticles
Authors: Ling, CW
Xiao, M
Chan, CT
Yu, SF 
Fung, KH 
Issue Date: 2015
Publisher: Optical Society of America
Source: Optics express, 2015, v. 23, no. 3, p. 2021-2031 How to cite?
Journal: Optics express 
Abstract: We study the topological edge plasmon modes between two "diatomic" chains of identical plasmonic nanoparticles. Zak phase for longitudinal plasmon modes in each chain is calculated analytically by solutions of macroscopic Maxwell's equations for particles in quasi-static dipole approximation. This approximation provides a direct analogy with the Su-Schrieffer-Heeger model such that the eigenvalue is mapped to the frequency dependent inverse-polarizability of the nanoparticles. The edge state frequency is found to be the same as the single-particle resonance frequency, which is insensitive to the separation distances within a unit cell. Finally, full electrodynamic simulations with realistic parameters suggest that the edge plasmon mode can be realized through near-field optical spectroscopy.
URI: http://hdl.handle.net/10397/27712
EISSN: 1094-4087
DOI: 10.1364/OE.23.002021
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