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Proceedings Paper

Theoretical foundations for size- and shape-selective laser-based manipulation of supported metal nanoparticles
Author(s): Tigran A. Vartanyan; Johannes Bosbach; Christian Hendrich; Frank Stietz; Frank Traeger
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Paper Abstract

We demonstrate that laser-based thermal processing of an ensemble of metal nanoparticles on a transparent substrate can be highly selective with regard to the dimensions of the particles. The selectivity originates from the resonant dependence of the absorption cross section for surface plasmon excitation of a metal nanoparticle on its size and shape. This makes possible resonant heating by selective absorption and subsequent rapid quenching of the deposited energy by electron-phonon coupling. As a result, the temperature rise of a nanoparticle is determined by the absorbed photon energy and by the thermal properties of the substrate rather than by the heat flow between the particles, provided their number density and the laser pulse duration are properly chosen. Finally, desoprtion and diffusion activated by the temperature rise cause substantial changes of the particle size and shape. These laser-induced modifications are even more selective than laser-stimulated heating due to a threshold-like dependence of the thermally activated processes on the temperature of an individual particle. Altogether this can be exploited in a novel technique to control the size and shape distribution of supported metal nanoparticles through laser illumination in a very precise manner. Here, we present a detailed theoretical treatment of all aspects of selective laser- induced thermal processing of nanoparticles.

Paper Details

Date Published: 18 March 2002
PDF: 7 pages
Proc. SPIE 4636, Nanoscience Using Laser-Solid Interactions, (18 March 2002); doi: 10.1117/12.459734
Show Author Affiliations
Tigran A. Vartanyan, S.I. Vavilov State Optical Institute (Russia)
Johannes Bosbach, Univ. Kassel (Germany)
Christian Hendrich, Univ. Kassel (Germany)
Frank Stietz, Univ. Kassel (Germany)
Frank Traeger, Univ. Kassel (Germany)

Published in SPIE Proceedings Vol. 4636:
Nanoscience Using Laser-Solid Interactions
Kouichi Murakami; David B. Geohegan; Frank Traeger, Editor(s)

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