SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster: Plasmonics and Nanooptics I

O 43.2: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Switching nonlinear emission patterns of plasmonic nanostructures — •Valentin Dichtl, Kilian Wittman, Thorsten Schumacher, and Markus Lippitz — Experimental Physics III, University of Bayreuth, Germany

The nonlinear third-order material response of noble metals allows to shape the third-harmonic near field around a plasmonic nanostructure [1]. The corresponding spatial emission pattern of the third harmonic hot spots changes drastically when slightly tuning the fundamental wavelength over a linear resonance of the nanorod. This raises the question of whether similar behavior can be found for other nonlinear emission processes.

Here, we demonstrate by hyperspectral imaging that not only the third- but also the second-harmonic and especially the two- (or multi-) photon excited luminescence (TPPL) emission changes spatially, when tuning over the plasmon resonance. We discuss spatial and spectral differences between these processes.
The outlook is targeted towards selectively exciting single quantum emitters in the nearfield. As first step into this direction we present differences in the spatial change of luminescence of a dye film with respect to the underlying emission pattern.

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