Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 23.6: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Higher Harmonics Generation in Single Extended Gold Nanostructures — •Julian Obermeier, Thorsten Schumacher, Daniela Wolf, 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 and nonlinear field becomes important. In our experiments we investigate the spectrally dependent local nonlinear response of single gold nanostructures ranging from a few hundreds of nanometers to several micrometers in size. 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, the back focal plane pattern of the nonlinear emission carries information of its phase and directivity. On this poster, we present our method and first experimental results to determine the local emission properties of extended gold nanostructures.