Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 24: Plasmonics & Nanooptics I: Metastructures and Novel Techniques (joint session O/CPP)
O 24.9: Vortrag
Dienstag, 2. April 2019, 12:30–12:45, H8
Influence of laser parameters on spatially periodic heating of metals induced by surface plasmon polaritons — •Pavel N. Terekhin1,2, Pascal D. Ndione1, Sebastian T. Weber1, and Baerbel Rethfeld1 — 1Department of Physics and Research Center Optimas, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2National Research Centre "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
We present a detailed investigation of periodic heating of metals and periodic structure formation on their surfaces induced by surface plasmon polaritons (SPPs) after irradiation with ultrashort laser pulses. The interference of the incident and the SPPs electromagnetic waves leads to an enhancement of the resulting field and, therefore, a spatial modulation of the deposited laser energy.
Our aim is to show the influence of laser parameters on the formation of surface structures. The two-temperature model (TTM) is used to calculate the evolution of electronic and lattice temperatures. A new source term in the TTM, which takes into account plasmonic subsystem, is derived. The results obtained indicate that the electronic temperature shows the same spatial oscillations as the source term. Further, these oscillations are still present in the lattice temperature when being heated to the melting point. That could cause the formation of the periodic structures on the surface of the solid. Therefore, the developed model allows calculating materials' heating after ultrashort laser irradiation and studying the fundamental mechanisms of laser energy absorption under controlled conditions.