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O: Fachverband Oberflächenphysik
O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas
O 65.9: Vortrag
Mittwoch, 18. März 2020, 12:30–12:45, WIL A317
Electro-Chemistry of two closely spaced electrically-connected plasmonic antennas in air — •Luka Zurak, Bert Hecht, and Thorsten Feichtner — Nano-Optics & Biophotonics Group, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), Experimental physics 5 - Universität Würzburg, Germany
It has been shown that small resonant plasmonic nano particles can be tuned by applying a voltage, when placed in an electro-chemical environment. Resonance shifts can be due to double-layer formation, surface chemistry or charging which are notoriously difficult to distinguish.
We have developed a system of two parallel electrically connected gold nanorods with unequal lengths and resonances. They are placed at a distance of 150 nm. We show by means of time dependent white light spectroscopy that the humidity of ambient air is sufficient to support electrochemistry at the rod surfaces when voltages of up to ±20 V are applied. Electrochemical processes reveal themselves by small shifts of the nanorod resonances with a slow time constant on the order of 10 seconds. When the same experiments are performed under a N2 atmosphere, the resonance shifts nearly completely vanish.