Photophysics of Metal Nanoparticles: Heat Dissipation and Coherent Excitation of Phonon Modes

Gregory V. Hartland; Min Hu

doi:10.1117/12.452427

15 November 2002 Photophysics of Metal Nanoparticles: Heat Dissipation and Coherent Excitation of Phonon Modes

Gregory V. Hartland, Min Hu

Proceedings Volume 4807, Physical Chemistry of Interfaces and Nanomaterials; (2002) https://doi.org/10.1117/12.452427
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Gregory V. Hartland and Min Hu "Photophysics of Metal Nanoparticles: Heat Dissipation and Coherent Excitation of Phonon Modes", Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); https://doi.org/10.1117/12.452427

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