Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Poster Tuesday: Ultrafast Processes 2
O 33.4: Poster
Dienstag, 6. September 2022, 11:00–13:00, P3
Transient optical properties in non-equilibrium laser excited noble metals — •Marius Wenk1, Pascal D. Ndione1, Sebastian T. Weber1, Dirk O. Gericke2, and Baerbel Rethfeld1 — 1Department of Physics and OPTIMAS Research Center, Technische Universität Kaiserslautern — 2CFSA, Department of Physics, University of Warwick
Ultrashort laser pulses can induce strong modifications of material properties of solids such as creating highly transient optical parameters. After excitation with lasers of high power, the conduction electrons thermalize quickly to a hot Fermi distribution. Yet, the band occupation numbers can still be far from equilibrium.
We study excitation of noble metals such as copper and gold with visible photons. We use a two-temperature model and construct electron density-resolved rate equations to simulate the non-equilibrium band occupation [1]. Applying the results of the simulation, particularly the occupation and temperature data, we compute the time-resolved dielectric function based on the Drude-Lorentz formalism. In order to compare the results with experimental data, we calculate the transient optical properties such as probe reflectivity and transmissivity. Our predictions are compared with time-resolved measurements of optically excited metals, thus providing insights to electron dynamics on femto- and picosecond timescales.
[1] Pascal D. Ndione, Sebastian T. Weber, Dirk O. Gericke, and Baerbel Rethfeld. Scientific Reports, 12(1) 4693 (2022)