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O: Fachverband Oberflächenphysik

O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 83.1: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Steps towards higher harmonics pump-probe spectroscopy — •Julian Obermeier, Thorsten Schumacher, and Markus Lippitz — University of Bayreuth, Germany

In the last decade the field of nonlinear plasmonics has been growing rapidly. Many fascinating experiments have shown the nonlinear emission of complex nanostructures, methods to enhance the emission and that the nonlinear near field of nanostructures can be shaped remotely. Yet, also some fundamental questions are still unanswered, for example, how nonlinear plasmonic effects are connected to the band structure and especially the electronic occupation function. A well known way to cause time-dependent modifications of both is intense pulsed optical pumping. Interband absorption followed by Auger recombination as well as rethermalized electron distributions both lead to a transiently drastically increased electron temperature.

Here we investigate the influence of hot electrons on the nonlinear optical response of plasmonic particles and structures. This will not only give us new insight in the nonlinear processes themselves but also allow us to deterministically alter them. We present our higher harmonics pump-probe setup and experimental results of pump induced changes in the third harmonic emission of plasmonic structures.