@article{2017-bleckmann-alberti-phys-rev-b-v96-p045417, 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.

}, Author = {Bleckmann, F. AND Cherpakova, Z. AND Linden, S. AND Alberti, A.}, Journal = {Phys. Rev. B}, Pages = {045417}, Title = {{Spectral imaging of topological edge states in plasmonic waveguide arrays}}, Volume = {96}, Year = {2017} }