Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Poster: Tribology and Misc.
O 85.6: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Optical properties of laser-excited metals in strong nonequilibrium — •Pascal D. Ndione1, Sebastian T. Weber1, Dirk O. Gericke2, and Baerbel Rethfeld1 — 1Department of Physics and OPTIMAS Research Center, Technische Universitaet Kaiserslautern, 67653 Kaiserslautern, Germany — 2Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
Light-matter interactions in the femtosecond regime are of great importance for both our fundamental understanding and applications. The modification of optical properties is a key feature as reflectivity or transmissivity carry many informations about the correlated many body system. Short lasers pulses induce nonequilibrium in metals due to absorption of the photons' energy by the free electrons. On a time scale of a few tens to hundreds of femtoseconds after laser irradiation, the electrons thermalize to a Fermi distribution at an elevated temperature. We present here a model which keeps track of the band's occupation in metals triggered with optical photons. In addition, different approximations of the dielectric function are compared for metals driven far from equilibrium.