Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.12: Poster

Tuesday, March 21, 2017, 18:30–20:30, P2-OG1

Higher Harmonics Generation in tapered Plasmonic Waveguides — •Julian Obermeier and Markus Lippitz — Experimental Physics III, University of Bayreuth

Higher harmonics generation in single gold nanostructures is a commonly known effect. Many fascinating experiments showed that the nonlinear emission is strongly influenced and shaped by the particle plasmon resonance. However, when the structure dimension exceeds the diffraction limited excitation area, the higher order modes of the structure and even propagation of the fundamental field and waveguiding effects become important. In our experiments we investigate the local nonlinear response of single tapered plasmonic slab waveguides with finite width. After excitation with pulsed infrared light, the locally generated second and third harmonic field is emitted in the near ultraviolet and visible spectrum and collected by a high NA oil immersion objective. This configuration allows a high spatial resolution of the origin of the nonlinear emission far below the diffraction limit of the excitation wavelength. In addition power dependent measurements help to understand the nonlinear effects in the extended nanostructures but also show deviations from basic expectations. We present our measurement technique and experimental results to determine the local emission properties of extended gold nanostructures.