Spectral imaging of topological edge states in plasmonic waveguide arrays

Article

关键词: INSULATORS;    PHOTONICS;    SOLITONS;    LATTICES;   

DOI  :  10.1103/PhysRevB.96.045417

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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