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O: Fachverband Oberflächenphysik
O 96: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy II
O 96.5: Vortrag
Freitag, 21. März 2025, 11:30–11:45, H4
Discovery of phonon-polaritonic skyrmions: Transition from bubble- to Néel-type — •Florian Mangold1, Enrico Baù2, Lin Nan2, Julian Schwab1, Thorsten Gölz2, Andrea Mancini2, Bettina Frank1, Andreas Tittl2, and Harald Giessen1 — 14th Physics Institute, Research Center SCoPE, and IQST, University of Stuttgart, Germany — 2Chair in Hybrid Nanosystems, Nano-Institute Munich, Ludwig-Maximilians Universität München, Germany
Optical skyrmions constitute an emerging and rapidly developing field in the domain of solid-state physics and photonics, allowing for control over topological light textures through light-matter interactions. However, until now their practical applications have been severely limited by inherent restrictions of materials with high optical losses and a lack of tunability between different topological properties. We leverage the steep dispersion of silicon carbide thin films to image surface phonon polariton skyrmion lattices via near-field microscopy and experimentally demonstrate topological tuning between Bubble- and Néel-type skyrmions, a unique advantage that polar dielectrics offer over most existing approaches. The ability to control and manipulate these skyrmion lattices through small changes (<10%) in excitation wavelength allows for tailoring the size of individual skyrmions by a factor of 4. Tuning topological properties has been a long-standing goal in the field of optics. Our results expand the tunability of skyrmions in evanescent waves and are a starting point to investigate other topological features in phononic systems such as merons, skyrmion bags and other complex structured light fields.
Keywords: Surface phonon polariton (SPhP); Skyrmion; Transition from bubble- to Néel-type; Silicon carbide (SiC); Scanning near-field optical microscope (SNOM)