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MM: Fachverband Metall- und Materialphysik

MM 12: Postersitzung I

MM 12.23: Poster

Monday, March 14, 2011, 17:30–19:00, P5

Molecular dynamics simulations of femtosecond laser ablation in copper — •Carolina Trichet Paredes, Steffen Sonntag, Johannes Roth, and Hans-Rainer Trebin — Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Germany

Femtosecond laser ablation of copper is investigated by using a hybrid simulation scheme. Two equations are solved simultaneously: One for the electronic system, which accounts for laser energy absorption and heat conduction, the other for the dynamics of the lattice where the ablation process takes place. For the electron-temperature a generalized heat-conduction equation is solved by applying a finite difference scheme. For the lattice properties, e.g. pressure, density or temperature, we use common molecular dynamics. Energy transfer between the subsystems is allowed by introducing an electron-phonon coupling term.

Spallation instead of ablation as a ruling phenomenon for thin copper films of various thicknesses was observed. However, it will be shown that the heat conduction plays a crucial role: By changing its value a transition from spallation to ablation occurs. Besides, the ablation rates and cluster size distribution of the ablated material will be compared to recent experiments.