Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 19: Teilchen und Cluster II

O 19.8: Talk

Tuesday, March 9, 2004, 13:00–13:15, H39

Shaping silver nanoparticles with cw laser light — •M. Alschinger, N. Borg, F. Hubenthal, and F. Träger — Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology - CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel

Nanoparticles and systems in the nanometer size regime have been studied intensively in recent years. These systems have e.g. electronic, optical and catalytic properties which differ considerably from those of the corresponding bulk material and depend strongly on the size and morphology of the structures under investigation. For many applications it is very important to prepare nanoparticles on surfaces with well-defined sizes and shapes, e.g. for optical filters which selectively block radiation in narrow wavelength intervals. A widely used method to prepare nanoparticles on surfaces is to deposit metal atoms on substrates followed by Volmer-Weber growth. However, this usually produces nanoparticle ensembles with a broad distribution of sizes and shapes. To overcome this disadvantage our group has developed a laser-based method to tailor nanoparticles with well defined dimensions. We showed that, irradiating the particles with ns pulsed laser light during growth systems of reduced dimensions can be prepared with a predetermined axial ratio independent of size [1]. This method has been extended to the use of cw laser irradiation of different wavelength. For silver particles on quartz we have observed a strong dependence of the process of nanoparticles shaping on the intensity of the cw laser light.

[1] T. Wenzel et al., Appl. Phys. B. 69, 513 (1999)