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Proceedings Paper

Photophysics of Metal Nanoparticles: Heat Dissipation and Coherent Excitation of Phonon Modes
Author(s): Gregory V. Hartland; Min Hu
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Paper Abstract

Ultrafast laser excitation of metal nanoparticles can create temperature increases of many hundreds of Kelvin. The aim of this paper is to provide an overview of our recent experimental studies of heat dissipation and the coherent generation of acoustic phonon modes in the particles. Our results show that the rate of heat dissipation depends on the surface area of the particles, and that both impulsive lattice heating and hot-electron pressure contribute to phonon excitation. The measured periods also depend on the pump laser intensity: higher intensities yield slower periods. This softening of the coherently excited phonon modes is due to the temperature dependence of the elastic constants of the particles.

Paper Details

Date Published: 15 November 2002
PDF: 11 pages
Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); doi: 10.1117/12.452427
Show Author Affiliations
Gregory V. Hartland, Univ. of Notre Dame (United States)
Min Hu, Univ. of Notre Dame (United States)

Published in SPIE Proceedings Vol. 4807:
Physical Chemistry of Interfaces and Nanomaterials
Jin Z. Zhang; Zhong L. Wang, Editor(s)

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