Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory

O 43.13: Vortrag

Dienstag, 17. März 2020, 13:30–13:45, WIL A317

Laser-induced periodic surface structures formation on various materials — •Pavel N. Terekhin, Pascal D. Ndione, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

The use of ultrashort laser pulses for surface nanostructuring is of great importance in technological and medical applications. Thus, understanding of the basic governing mechanisms of energy deposition to the irradiated material is very important. On a rough material surface, grating structures or at a step edge ultrashort laser pulses can excite surface plasmon polaritons (SPP), i.e. surface plasmons coupled to a laser electromagnetic wave. One of the possible scenarios for the description of laser-induced periodic surface structures (LIPSS) is based on the SPP excitation and their interference with the incident beam.

The spatial and temporal evolution of the periodically modulated absorbed laser energy is studied after irradiation of various metals in the framework of the two-temperature model (TTM). We present a new analytical source term in the TTM, which takes into account the excited plasmon subsystem and therefore spatial periodicity. The developed method can be used to study the mechanisms of laser energy absorption under controlled conditions and for investigation of the properties of the excited SPP.