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TT: Fachverband Tiefe Temperaturen

TT 55: Topology and Symmetry Protected Materials (joint session O/TT)

TT 55.6: Talk

Wednesday, March 20, 2024, 16:15–16:30, HL 001

Phase-resolved near-field mapping of tight-binding lattices — •Hans-Joachim Schill, Anna Sidorenko, and Stefan Linden — Physikalisches Institut, Universität Bonn, D-53115-Bonn, Germany

The propagation of light in coupled arrays of dielectric loaded surface plasmon polariton waveguides (DLSPPWs) closely resembles the dynamics of a lattice Schrödinger equation, making it an excellent platform for simulating condensed matter lattice systems. The real and momentum space intensity distributions can be simply recorded by leakage radiation microscopy. In order to also capture the local near-field amplitude and phase with sub-wavelength resolution, we employ scattering-type scanning near-field optical microscopy in transmission mode. As an example, to discuss the capabilities of this dual-technique approach, we investigate the topological edge state in a plasmonic variant of the Su-Schrieffer-Heeger model. The topological nature of this state has been shown previously by spectral imaging of the edge mode residing in the band gap [1], but the characteristic electric field oscillation remained elusive, until now.

[1] F. Bleckmann, Z. Cherpakova (Fedorova), S. Linden and A. Alberti, "Spectral imaging of topological edge states in plasmonic waveguide arrays", Phys. Rev. B 96, 045417 (2017)

Keywords: Topology; Near-field microscopy; SSH-model; Leakage radiation microscopy; Plasmonic waveguides