Spectral imaging of topological edge states in plasmonic waveguide arrays

Abstract

We report on the observation of a topologically protected edge state at the interface between two topologically distinct domains of the Su-Schrieffer-Heeger model, which we implement in arrays of evanescently coupled dielectric-loaded surface plasmon polariton waveguides. Direct evidence of the topological character of the edge state is obtained through several independent experiments: Its spatial localization at the interface as well as the restriction to one sublattice is confirmed by real-space leakage radiation microscopy. The corresponding momentum-resolved spectrum obtained by Fourier imaging reveals the midgap position of the edge state as predicted by theory.

arXiv comment6 pages, 6 figures. In this new revision, new experimental data are shown in Fig. 3 and numerical calculations based on a finite element method are also provided

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• Observation of a topological edge state stabilized by dissipation
• Localized Plasmons in Topological Insulators
• Existence of a negative next-nearest-neighbor coupling in evanescently coupled dielectric waveguides
• Topological transitions in dissipatively coupled Su-Schrieffer-Heeger models
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• PC-symmetry-protected edge states in interacting driven-dissipative bosonic systems
• Realization of topological superlattices and the associated interface states in one-dimensional plasmonic crystals
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