Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 53: Surface Nanopatterns
O 53.13: Talk
Wednesday, February 27, 2008, 18:15–18:30, MA 043
Self-organized nano-patterning of solid surface: dependence on the target material — •Olga Varlamova1,2, Guobin Jia2, and Juergen Reif1,2 — 1LS Experimentalphysik II, BTU Cottbus, Konrad-Wachsmann-Allee 1, 03046 Cottbus — 2IHP/BTU Joint-Lab, Konrad-Wachsmann-Allee 1, 03046 Cottbus
Self-organized surface patterns (ripples) were induced on different materials (dielectrics, semiconductors, metals and amorphous silica)by femtosecond laser irradiation with intensity below the single-shot damage threshold. In all cases, the dependence on characteristic features like irradiation dose and laser polarization was studied in our experiments. It is shown, that general features of the surface patterns do not depend on the type of material, nor was any correlation to the atomic structure of the irradiated surface detected. Instead, in all materials a similarly strong correlation between polarization direction of the laser beam and the orientation of the ripples is observed. The main difference between the different targets, however, is the intensity dependence of typical feature sizes and a specific window of irradiation dose for each material to produce surface nano-pattering.