Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II

O 57.2: Vortrag

Mittwoch, 11. März 2026, 11:00–11:15, HSZ/0403

Steps Towards Excitation of Quantum Emitters with Switchable Nonlinear Near Fields — •Valentin Dichtl, Thorsten Schumacher, and Markus Lippitz — Experimental Physics III, University of Bayreuth

The third-order nonlinear material response of noble metals enables the formation of the third-harmonic near field around a plasmonic nanostructure. The corresponding spatial emission pattern of the third-harmonic hot spots changes drastically when the fundamental wavelength is slightly tuned over a linear resonance of the nano antenna [1]. This effect can be used to spatially tailor the near field for excitation of various emitters – such as molecules or quantum dots – beyond the diffraction limit.

We identified distinct differences in the nonlinear scattering behavior between the complentarry plasmonic structures rod and slit [2]. Building on this insight we compare these geometries in terms of their suitability for single emitter excitation.

We demonstrate non-destructive third-harmonic generation in close proximity to fluorescent dyes. Finally, we discuss spectral and temporal strategies for discriminating photons originating from fluorescence versus those from harmonic generation.

[1] Wolf, D. et al. Shaping the nonlinear near field. Nat. Commun. 7:10361 (2016). doi: 10.1038/ncomms10361

[2] Dichtl, V. et al. The Nonlinear Limit of Babinet’s Principle. Nano Lett. 2025, 25, 11084-11088. doi: 10.1021/acs.nanolett.5c02210

Keywords: Plasmonik; nonlinear; invers; Babinet; THG