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Q: Fachverband Quantenoptik und Photonik
Q 45: Plasmonics and Metasurfaces
Q 45.3: Vortrag
Donnerstag, 5. März 2026, 11:45–12:00, P 3
A new framework for topological plasmonics — •Julius T. Gohsrich1,2, Norman S. Israel3, Lora Ramunno3, and Flore K. Kunst1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany — 3Department of Physics and Nexus for Quantum Technologies Institute, University of Ottawa, Ottawa, Canada
Plasmonics is the study of the interaction between light and free electrons at metal-dielectric interfaces at the nanoscale. A versatile platform in this field are systems of coupled metallic nanoresonators (MNRs), which are for example used to construct metasurfaces for sensing applications. Topological phenomena can provide novel functionalities to the already rich physics of such structures.
I will present a new framework to analyze the topology of coupled MNRs. Having all relevant properties of the constituent MNRs, the properties of the coupled MNR system are encoded in the solutions of a non-Hermitian eigenvalue problem. Employing our method, we analyze a plasmonic SSH model, and compare our results with full-wave numerics. Our approach allows different approximations, resulting in computational efficiency and scalability compared to full-wave numerics, making it a powerful tool for analyzing topological plasmonic structures and shaping our understanding of these. Beyond that, the presented methods allow for the optimization and design of topological plasmonic nanostructures with potential applications in sensing, microscopy and optical communication.
Keywords: topology; plasmonics; non-Hermitian physics; nanophotonics; light-matter interactions