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Title: Topological edge plasmon modes between diatomic chains of plasmonic nanoparticles
Authors: Ling, CW 
Xiao, M
Chan, CT
Yu, SF 
Fung, KH 
Issue Date: 9-Feb-2015
Source: Optics express, 9 Feb. 2015, v. 23, no. 3, p. 2021-2031
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.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.23.002021
Rights: © 2015 Optical Society of America
© 2015 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
The following publication Ling, C. W., Xiao, M., Chan, C. T., Yu, S. F., & Fung, K. H. (2015). Topological edge plasmon modes between diatomic chains of plasmonic nanoparticles. Optics express, 23(3), 2021-2031 is available at https://doi.org/10.1364/OE.23.002021.
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