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O: Fachverband Oberflächenphysik

O 69: Nanostructures at Surfaces II

O 69.3: Vortrag

Mittwoch, 19. März 2025, 15:30–15:45, H25

Electrical Modulation of a Plasmonic Single Particle Resonance — Luka Zurak¹, Christian Wolff², Jessica Meier¹, René Kullock¹, •Asger Mortensen², Bert Hecht¹, and Thorsten Feichtner¹ — ¹Nano-Optics and Biophotonics Group, Experimentelle Physik 5, Universität Würzburg, 97074 Würzburg, Germany — ²POLIMA Center for Polariton-driven Light-Matter Interactions, University of Southern Denmark, DK-5230 Odense M, Denmark

Acitive modulation of plasmonic resonances is a promising route towards optical switches smaller way that than the diffraction limit. However, due to the difficulties to directly electrically connect a single resonator most experiments in this direction have been performed on large scales and/or in electrochemical environments – hampering interpretation and application.

Here, we demonstrate fast modulation of the plasmonic resonance of a single electrically connected gold nano-rod [1]. We employ a lock-in amplifier to measure the relative change of scattering signal ΔS/S₀ in the spectral range from 500 to 900 nm, while driving our structure with up to 50 kHz in frequency and up to 40 V in voltage amplitude. Results are of the expected order of magnitude according to existing theories. We discuss some of the theories in detail, like classical surface currents or the introduction of Feibelman parameters to account for non-classical electron spill-out at metal surfaces.

[1] Zurak, L., et al. (2024). Modulation of surface response in a single plasmonic nanoresonator. Science Advances, 10(36), eadn5227.

Keywords: Plasmonics; Surface response; Feibelman parameters; active optics; Helium ion fabrication