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Q: Fachverband Quantenoptik und Photonik

Q 22: Ultrakurze Laserpulse: Anwendungen 1

Q 22.2: Vortrag

Dienstag, 15. März 2011, 10:45–11:00, SCH A01

Generation and characterization of femtosecond-laser induced nanostructures on thin gold films — •Conny Axel Hulverscheidt, Martin Reininghaus, and Dirk Wortmann — RWTH Aachen University, Lehrstuhl für Lasertechnik, Steinbachstr. 15, D-52074 Aachen

Femtosecond (fs)-laser radiation focused on a silicon substrate with a 60 nm thin gold film induces the formation of conical nanostructures, nanobumps and nanojets. Since the formation dynamics of these nanostructures are still not understood, the step for a theoretical understanding of this phenomenon has been done by means of Molecular Dynamics simulations. The comparison of theory and experiments with high temporal und spatial resolution gives an opportunity to have a microscopic view on the nanostructure formation kinetics. Therefore a pump-probe-experiment consisting of a combination of fs-laser and EUV-microscope is constructed. Time-resolved measurements in a pump-probe-setup require a reproducible generation of the nanobumps and nanojets. Additionally, debris or plasma-generation has to be avoided to prevent damage on the EUV-optics. The influence of the laser-parameters pulse-energy, pulse-duration and focus on the generation of nanobumps and nanojets is investigated. Previous experiments have shown that the morphology and thickness of the gold film has also an impact on the formation of nanostructures, thus its influence on the formation dynamics is determined. The laser-parameters and gold film characteristics define the required parameter window allowing ablation-free generation of nanobumps and nanojets.