Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Ultrafast and Nonlinear Plasmonics

O 11.7: Vortrag

Montag, 16. März 2015, 16:30–16:45, MA 004

Local Nonlinear Spectroscopy of Single Gold Nanostructures — •Daniela Wolf, Thorsten Schumacher, and Markus Lippitz — Experimental Physics III, University of Bayreuth

While higher harmonics generation is a commonly known effect and is used in many applications, the origin of the higher harmonics light generated in plasmonic nanostructures is still not fully understood. Contrary to the luminescence from gold structures, higher harmonics generation is a coherent process so that interference effects come into play when more complex structures are considered. In our experiments, we investigate the response of different gold nanostructures upon excitation with infrared light. The homogeneous luminescence background as well as the interference effects in the third harmonic signal can be observed in spectrally resolved backfocal plane images. In combination with calculated interference patterns from a dipole model, this method allows conclusions about the spatial origin of THG.