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O: Fachverband Oberflächenphysik
O 71: Poster: Plasmonics and Nanooptics
O 71.13: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster D
Nanoscale Plasmonic Su-Schrieffer-Heeger Chains — •Benedikt Schurr1,3, Luisa Brenneis2, Felix G. Kaps3,5, Matthias Hensen2, Philipp Grimm1,3, Philipp Kessler2, Tobias Helbig4, Tobias Hofmann4, Thorsten Feichtner1,3, Monika Emmerling1, Susanne C. Kehr3,5, Tobias Brixner2, Ronny Thomale3,4, Lukas M. Eng3,5, and Bert Hecht1,3 — 1NanoOptics & Biophotonics Group, Experimental Physics 5, University of Wuerzburg — 2Institut fuer Physikalische und Theoretische Chemie, University of Wuerzburg — 3Wuerzburg-Dresden Cluster of Excellence ct.qmat — 4Institute for Theoretical Physics and Astrophysics, 1-4: University of Wuerzburg, Am Hubland, 97074 Wuerzburg, Germany — 5Institut fuer Angewandte Physik, Technische Universitaet Dresden, 01062 Dresden, Germany
The Su-Schrieffer-Heeger (SSH) model describes one-dimensional (1D) periodic chains of coupled resonators with alternating coupling strengths. It features topologically protected and localized edge states. We fabricate and characterize plasmonic particle SSH-chains with alternating gaps in the nanometer range by focused He-ion beam milling starting from single-crystalline gold micro-platelets. Finite-difference time-domain (FDTD) simulations show the occurrence of edge modes for such geometries whose eigenfrequencies can be controlled by the particle length and the gap size. Using scattering scanning near-field optical microscopy (sSNOM) as well as photoemission electron microscopy (PEEM) of different chain configurations we obtain highly resolved near-field maps indicating edge-state formation.
Keywords: Plasmonics; Light-matter interaction and topology; Helium ion beam milling; sSNOM; PEEM