Topological Surface-plasmon-polaritons on Corrugated Metal-dielectric Surfaces
Mesoscale and Nanoscale Physics
2021-06-18 v2 Materials Science
Abstract
We study topological surface-plasmon-polaritons at optical frequencies in diffraction gratings formed by bipartite corrugated metal-dielectric gratings. To do so we implement the theory as developed in Della Valle and Longhi to describe the amplitude of the field by an emergent Schr\"odinger-like equation. The tri-harmonic grating generates a bipartite Kronig-Penney model. Topologically protected localised modes are then predicted to occur at the edges of the grating and at defects formed by the combination of two mirror antisymmetric corrugations, whose bulk invariant is a step-wise varying Zak phase in both cases.
Keywords
Cite
@article{arxiv.2007.00025,
title = {Topological Surface-plasmon-polaritons on Corrugated Metal-dielectric Surfaces},
author = {Thomas Benjamin Smith and Coskun Kocabas and Alessandro Principi},
journal= {arXiv preprint arXiv:2007.00025},
year = {2021}
}
Comments
6 pages of main, 9 pages of appendix, 5 figures