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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Poster

K 4.8: Poster

Dienstag, 10. März 2020, 16:30–18:30, f428

A semiclassical Two Temperature-Hydrodynamic Model for surface plasmons-polaritons assisted nanostructuring of metals using ultrafast laser pulses — •Othmane Benhayoun — Department of Theoretical Physics II, University of Kassel

We propose a semiclassical Two Temperature-Hydrodynamic Model (TTH) based on field equations to investigate the role of electrons and surface plasmons-polaritons on the energy exchange with the lattice, which can lead to the creation of laser induced periodic surface structures (LIPSS) in metals subject to ultrashort laser pulse excitation. The TTH equations are constructed by applying perturbation theory on the energy-, momentum- and density conservation equations of the electronic system. We consider three subsystems: the lattice, the thermalized electrons and the surface plasmons, all of which are coupled to each other by collision terms, and coupled to an external laser field. A numerical analysis is then performed on gold, where we compare our results with the classical TTM for different laser fluences, and show the emergence of an oscillation pattern in the electronic and lattice temperature distribution, in both single and multi-pulse regimes, which can be responsible for the formation of ripples on the surface of the material.