SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster: Plasmonics and Nanooptics I
O 43.6: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Resistive heating of monocrystalline plasmonic resonators — •Jacob Syndikus, Luka Zurak, Jessica Meier, Bert Hecht, and Thorsten Feichtner — Nanooptics & Biophotonics Group, Experimental Physics 5, RCCM, JMU Würzburg, Am Hubland, D-97074 Würzburg, Germany
Plasmonic resonators can focus light down to sub-diffraction-limited near-field intensity volumes by collective oscillations of photons and electrons. Therefore, they are hot candidates for electro-optical devices with minimal footprint, bridging the gap between fiber communication and electronics or even being optical switches by themselves. To achieve this, the plasmonic properties have to be actively tuned, the faster the better.
Here we show experimentally the modulation of the wavelength dependent scattering intensity by a gold nanorod in the MHz range by resistive heating. Application of an AC voltage heats the gold material by several tens of Kelvin, changing the electron energy density and with it the dielectric constant εAu. The small volume and the electrical contacts ensure fast heat dissipation. We fabricate the structures from monocrystalline goldflakes by means of Ga- and He-ion beam milling and measure the changes in the resonance curves via white light laser illumination and modelocking detection. Numerical models show that GHz modulation is feasible to be realized which makes the technique interesting for applications.