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O: Fachverband Oberflächenphysik

O 49: Poster: Nanostructures on Surfaces I

O 49.12: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Radiation pattern of the third harmonic emission generated in metal nanoantennas — •Torsten Stiehm, Johannes Kern, Robert Schmidt, Marius Jürgensen, Steffen Michaelis de Vasconcellos, and Rudolf Bratschitsch — Institute of Physics and Center for Nanotechnology University of Münster, 48149 Münster, Germany

Plasmon resonances in metallic nanoantennas give rise to strong field enhancements. This drastically boosts the nonlinear light-matter interaction in the metal and enables efficient third harmonic generation. We measure the angular distribution of the third harmonic emission of gold nanoantennas [1]. Single and multiple nanoantennas with resonances in the infrared [2] are excited by ultrashort laser pulses. The third harmonic emission is analyzed with back focal plane imaging using a high numerical aperture objective lens. Our experimental findings are in excellent agreement with numerical calculations.
1. T. Stiehm, J. Kern, M. Jürgensen, S.M. de Vasconcellos, R. Bratschitsch, Appl. Phys. B 122, 1 (2016)
2. T.Stiehm, J.Kern, R.Schmidt, S.M. de Vasconcellos, R. Bratschitsch, Appl. Phys. B 123, 150 (2017)