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O: Fachverband Oberflächenphysik

O 65: Poster: Topology and Symmetry-Protected Materials

O 65.4: Poster

Wednesday, March 29, 2023, 18:00–20:00, P2/EG

Near-field investigation of topologically protected edge states in plasmonic waveguide arrays — •Hans-Joachim Schill, Anna Sidorenko, and Stefan Linden — Department of Physics, University of Bonn, Germany

Light propagation along evanescently coupled waveguide arrays resembles mathematically the dynamics of a lattice Schrödinger equation and is, therefore, ideally suited for simulating condensed matter lattice systems. Here, we report on near-field measurements with scattering-type scanning near-field optical microscopy (s-SNOM) in transmission mode combined with leakage radiation microscopy to investigate topological effects in coupled arrays of dielectric loaded surface plasmon polariton waveguides (DLSPPWs). Specifically, we implement the Su-Schrieffer-Heeger (SSH) model by fabricating arrays of DLLSPPWs with alternating weak and strong couplings. The interface between two topologically distinct domains of the SSH model is known to host a topologically protected edge state. The combination of far- and near-field imaging allows us to investigate the global intensity evolution of the lattice as well as the local amplitude and phase distribution of the edge state.