SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy I

O 58.7: Vortrag

Mittwoch, 29. März 2023, 16:45–17:00, WIL A317

Nano-scale Plasmonic Su-Schrieffer-Heeger Chains — Benedikt Schurr^1,4, Philipp Grimm¹, Tobias Helbig², Tobias Hofmann², Lukas Wehmeier³, Felix G. Kaps³, •Thorsten Feichtner^1,4, Monika Emmerling¹, Susanne C. Kehr³, Lukas Eng^3,4, Ronny Thomale^2,4, and Bert Hecht^1,4 — 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.