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Q: Fachverband Quantenoptik und Photonik

Q 45: Plasmonics and Metasurfaces

Q 45.1: Hauptvortrag

Donnerstag, 5. März 2026, 11:00–11:30, P 3

Quantum geometry in plasmonic metasurfaces and signatures of collective quantum phenomena — •Javier Cuerda — Institut für Angewandte Physik, TU Darmstadt, Hochschulstraße 4A, D-64289 Darmstadt, Germany — Department of Applied Physics, Aalto University School of Science, Aalto FI-00076, Finland

Plasmonic nanoparticles radiatively coupled in two-dimensional lattices, combined with organic quantum emitters, enable strong light-matter coupling, lasing, and BEC [1]. Their highly dispersive, polarization-dependent band structure, combined with time-reversal-symmetry breaking [2], produces a non-trivial quantum geometry. The organic emitters feature vibrational modes, hinting at novel collective light-matter coupling effects.

We present recent progress on these aspects. We have measured the quantum geometric tensor of a plasmonic lattice, finding a non-trivial quantum metric and a purely non-Hermitian Berry curvature [3]. We also show how vibrational modes affect dynamical superradiance in a cavity [4], enabling studies on collective quantum coherence in plasmonic metasurfaces.

[1] A. I. Väkeväinen, et al. Nature Comm. 11, 3139 (2020).

[2] F. Freire-Fernández, J. Cuerda, et al. Nature Phot. 16, 27 (2022).

[3] J. Cuerda, J. M. Taskinen, N. Källman, L. Grabitz, and P. Törmä. Phys. Rev. Res. 6 (2), L022020 (2024).

[4] L. Freter, P. Fowler-Wright, J. Cuerda, B. W. Lovett, J. Keeling, and P Törmä. Accepted for publication. arXiv:2305.13244 (2025).

Keywords: plasmonics; metasurfaces; quantum geometry; superradiance; light-matter coupling