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O: Fachverband Oberflächenphysik
O 58: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy I
O 58.7: Talk
Wednesday, March 29, 2023, 16:45–17:00, WIL A317
Nano-scale Plasmonic Su-Schrieffer-Heeger Chains — Benedikt Schurr1,4, Philipp Grimm1, Tobias Helbig2, Tobias Hofmann2, Lukas Wehmeier3, Felix G. Kaps3, •Thorsten Feichtner1,4, Monika Emmerling1, Susanne C. Kehr3, Lukas Eng3,4, Ronny Thomale2,4, and Bert Hecht1,4 — 1NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany — 4Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
The tight-binding Su-Schrieffer-Heeger (SSH) model describes 1D periodic chains of resonators with alternating coupling strengths. For certain configurations, topologically protected collective states occur at the edges. Here, we propose a plasmonic chain SSH-system with alternating few-nanometer gaps, fabricated from mono-crystalline Au-microplatelets by means of He-ion beam milling. Full FDTD simulations show the occurrence of edge modes for such geometries in real space. The frequency at which edge states occur can be fully controlled via particle size and the next-neighbour coupling via the gaps. Scattering scanning near-field optical microscopy (sSNOM) experiments provide first evidence for the presence of topologically protected edge states.