Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Nanostructures at surfaces: Dots, particles, clusters III

O 53.10: Vortrag

Donnerstag, 26. März 2009, 17:15–17:30, SCH A215

Generation of phononic themperature waves during short pulse laser nanostructuring experiments on metals — •Dmitry Ivanov and Baerbel Rethfeld — Technical University of Kaiserslautern, Physics Department, Erwin Schroedinger Str. 46, 67663 Germany

In this work we demonstrate the generation of phononic temperature waves in short pulse (pico- and femto-seconds) laser nanostructuring experiments on a metal surface. The existence of such waves was predicted based on numerical calculations with the atomistic-continuum model. This model describes the kinetics of transient nonequilibrium laser-induced processes at the atomic level and fast electron heat conduction in continuum. The analysis of obtained numerical data allowed to deduce the macroscopic parameters of observed thermal waves. The description of wave-like behavior within the frames of the diffusion equation is considered and the comparative analyzes between the continuum and the atomistic-continuum calculations is presented. The characteristic time of thermal wave relaxation was found to be on the level of 50 ns.