COHERENT ACOUSTIC-OSCILLATIONS IN METALLIC NANOPARTICLES GENERATED WITH FEMTOSECOND OPTICAL PULSES

Citation
M. Nisoli et al., COHERENT ACOUSTIC-OSCILLATIONS IN METALLIC NANOPARTICLES GENERATED WITH FEMTOSECOND OPTICAL PULSES, Physical review. B, Condensed matter, 55(20), 1997, pp. 13424-13427
Citations number
17
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
55
Issue
20
Year of publication
1997
Pages
13424 - 13427
Database
ISI
SICI code
0163-1829(1997)55:20<13424:CAIMNG>2.0.ZU;2-T
Abstract
Nonthermal generation of coherent-acoustic phanons is observed in meta llic nanoparticles of tin and gallium, which are solid and liquid, res pectively, at room temperature, by applying femtosecond pump-and-probe spectroscopy. Oscillations in the photo-induced differential reflecti on are clearly detected in the picosecond time domain. The measured pe riod increases approximately linearly with size over a wide range and extracted sound velocities are consistent with those of bulk. Transiti on to ballistic regime in carrier excitation is also discussed on the basis of the disappearance of oscillations for particle sizes below ho t-carrier mean free paths.