Jena 2013 – scientific programme

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K: Fachverband Kurzzeitphysik

K 9: Laseranwendungen und Lasermaterialbearbeitung III

K 9.3: Talk

Thursday, February 28, 2013, 17:00–17:15, HS 4

Molecular Dynamics Modeling of Short Laser Pulse Nanostructuring of Metals on the Experimental Scale — •Dmitry Ivanov^1,2, Vladimir Lipp^1,2, Baerbel Rethfeld¹, and Martin Garcia² — ¹Technische Universitaet Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern — ²University Kassel, Heinr.-Plett-Straße 40, 34132 Kassel

Short laser pulse surface nanoprocessing involves a number of concurrent fundamental physical processes. Due to different time and spatial scales of their activation it makes them difficult to study within the frames of a single computational approach and in the experimental analysis as well [1]. A transient character of the nonequilibrium states of matter induced with a short laser pulse hampers the applicability of continuum models, but classical Molecular Dynamics simulations are usually limited in the system sizes. In this work the MD-based model implemented in parallel algorithm and utilized in a coupling with a continuum description of the photo-excited free carrier's dynamics is extended to the scale directly accessible in the experiment [2]. The experimental data are then for the first time directly compared with the model predictions. The mechanisms responsible for the short laser pulse surface nanostructuring of metals are considered in the complex dynamics of competing processes simultaneously involved into the process. The modeling revealed a very good agreement with the experiment and predicted a new phenomenon potentially affecting the optical properties of material. [1] A.I. Kuznetsov et. al.,Appl Phys. A 94, 221 (2009). [2] D.S. Ivanov et. al., Appl. Phys. A. 92, 791 (2008).