Topological Surface-plasmon-polaritons on Corrugated Metal-dielectric Surfaces
arXiv:2007.00025 · doi:10.1088/1361-648X/abf7e0
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 Schrödinger-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.
arXiv comment6 pages of main, 9 pages of appendix, 5 figures
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