Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 83.2: Poster

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

Measuring Hot-Electron Dynamics by Pump-Probe Spectroscopy — •Fabian Paul, Julian Obermeier, Christoph Schnupfhagen, Thorsten Schumacher, and Markus Lippitz — University of Bayreuth, Germany

After excitation of a plasmonic structure with an ultrashort laser puls an athermal occupation function of electrons is generated that rethermalizes to a Fermi-Dirac distribution within about 15 fs. During the next tens of femtoseconds the most energetic electrons relax due to Coulomb interactions between each other and at last on a scale of several picoseconds interacting with the lattice structure relax back to thermal equilibrium. Due to the enormous improvement of super continuum lasers and pulse shapers in the last years, it is possible to generate femtosecond laser pulses and shape them nearly unlimited, so that one can easily do pump-probe experiments.

With this techniques it is now possible to measure the decay of these high energetic electrons on ultrafast timescales. We are using in the first step plasmonic nano-structures to increase the signal. The results will improve our understanding of the microscopic origin of plasmonic nonlinearities.