Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Surface Science: Misc.

O 58.3: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Optical properties of laser-excited metals under nonequilibrium conditions. — •Pascal D. Ndione1, Sebastian Weber1, Dirk O. Gericke2, and Baerbel Rethfeld11Department of Physics and Research Center Optimas, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

Improving our understanding of the response of materials under intense laser irradiation is critical for various applications. The modification of optical properties is also a key feature for fundamental science as reflectivity or transmission carry many information about the correlated many-body system. The present contribution investigates the behavior of metals subjected to short laser pulses of visible light. For metals, the laser directly excites the electrons which drives them out of equilibrium. On a time scale of a few tens to hundreds femtoseconds after laser irradiation, the electrons thermalize to a Fermi distribution at an elevated temperature. We are interested in the optical properties of metals under the nonequilibrium conditions during the relaxation process. Different approximations of the dielectric function are compared for thermalised metals. Then, we aim to include nonequilibrium electron distributions into the dielectric function.

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