Open AccessZak phase and topological plasmonic Tamm states in one-dimensional plasmonic crystals
Author(s) -
Lei Wang,
Wei Cai,
Mengli Bie,
Xinzheng Zhang,
Jingjun Xu
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.028963
Subject(s) - plasmon , topological insulator , photonic crystal , topology (electrical circuits) , photonics , phase (matter) , symmetry (geometry) , physics , materials science , optics , condensed matter physics , quantum mechanics , geometry , mathematics , combinatorics
The Zak phase and topological plasmonic Tamm states in plasmonic crystals based on periodic metal-insulator-metal waveguides are systematically investigated. We reveal that robust topological interfacial states against structural defects exist when the Zak phase between two adjoining plasmonic lattices are different in a common band gap. A kind of efficient admittance-based transfer matrix method is proposed to calculate and optimize the configuration with inverse symmetry. The topologically protected states are favorable for the spatial confinement and enhancement of electromagnetic fields, which open a new avenue for topological photonic applications.