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O: Fachverband Oberflächenphysik

O 87: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy I

O 87.1: Vortrag

Donnerstag, 20. März 2025, 15:00–15:15, H4

Nonlinear plasmonic near– and far fields in the context of Babinet’s Principle — •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 [1]. 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 nanorod.

However, third harmonic generation (THG) also leads to high temperatures in the structure and its surroundings. These temperatures are usually high enough to destroy more complex samples. Therefore, structures with the same emission properties but a higher ratio of THG to temperature are needed.

To overcome this, we are inspired by the Babinet principle. In this sense, a rod antenna can be replaced by a slit in a thin layer of gold. The surrounding gold should now dissipate heat more effectively than a single rod. This talk compares the (non-linear) emission properties of plasmonic nanostructures and their complementary counterparts, highlighting the applicability of Babinet’s Principle.

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

Keywords: Plasmonik; nonlinear; invers; Babinet; THG