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O: Fachverband Oberflächenphysik

O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)

O 18.73: Poster

Montag, 25. Februar 2008, 18:30–19:30, Poster F

Melting behaviour of metallic nanostructures — •Daniel Benner, Anja Habenicht, Paul Leiderer, and Johannes Boneberg — Universität Konstanz, Fachbereich Physik, LS Leiderer, 78457 Konstanz

Triangular flat metallic nanostructures and metallic films of identical thickness on inert substrates (e.g. glass, silicon) are illuminated by single intensive nanosecond laser pulses with fluences at and above the melting threshold and the melting behaviour of these two systems is compared.

For the metallic thin films we determine the melting threshold by nanosecond time-resolved reflectivity measurements which can be used to deduce the melting time. Upon melting of the nanostructures a dewetting process sets in which also reduces the reflected intensity. Our measurements show that the dewetting process of the nanostructures sets in at laser intensities well below the melting threshold of the films. For the dimensions of the nanostructures used here (thickness ~50nm, lateral dimensions ~ 200nm) reduced melting temperatures are not expected. Therefore we assign that behaviour to the increased absorption cross section of the nanostructures.