Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.32: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

STM studies of surface plasmon mediated laser annealing of gold films — •Markus Schmotz, Armin Fubel, and Paul Leiderer — Universität Konstanz, Konstanz, Germany

Using a Kretschmann configuration we illuminate thin polycrystalline gold films under the surface plasmon resonance angle. Thus, a frequency doubled Nd:YAG laser locally heats the films at different intensities. The investigation of structural changes of the gold surfaces is done in situ by a homebuilt STM. To gain quantitative information we study FFT-data (fast Fourier transformation) like PSD-spectra (power-spectrum-density) and autocorrelation functions beneath typical roughness parameters like RMS (root-mean-square) and MPP-values (mean-peak-to-peak). The influence of single and multi-shot treatment is also determined at higher and lower intensities, respectively.

Preliminary results show broadening and flattening of the typical gold mounds at low intensities and thus increasing correlation lengths and grain sizes. Reproducibility checks and analysis of detailed annealing mechanisms will be reported.