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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster VI

Q 55.43: Poster

Donnerstag, 14. März 2024, 17:00–19:00, Tent B

Nonlinear emission properties of inverted plasmonic nanostructures — •Valentin Dichtl, Thorsten Schumacher, and Markus Lippitz — Experimental Physics III, University of Bayreuth

The nonlinear third-order material response of noble metals allows the shaping 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 by a linear resonance of the nanorod.
However, third harmonic generation (THG) also leads to high temperatures in the structure and its surroundings. These temperatures tend to be high enough to destroy more complex samples. Therefore, structures with the same emission characteristics but a higher ratio of THG to temperature are needed.
To overcome this, we are inspired by Babinet’s principle. In this sense, a rod antenna can be replaced by a slit in a thin gold film. The surrounding gold should now be more effective in diffusing heat than a single rod. This poster compares the (nonlinear) emission properties of plasmonic nanostructures and their complementary counterparts.

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

Keywords: Plasmonic; nonlinear; invers; Babinet; THG