| Issue |
Europhys. Lett.
Volume 67, Number 3, August 2004
|
|
|---|---|---|
| Page(s) | 404 - 410 | |
| Section | Physics of gases, plasmas and electric discharges | |
| DOI | https://doi.org/10.1209/epl/i2004-10080-2 | |
| Published online | 01 July 2004 | |
Emission of nanoparticles during ultrashort laser irradiation of silicon targets
Coherentia - INFM and Dipartimento di Scienze Fisiche Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo Via Cintia, I-80126 Napoli, Italy
Corresponding author: amoruso@na.infn.it
Received:
6
April
2004
Accepted:
25
May
2004
We have experimentally observed that nanoparticles emission is a
peculiar feature of matter removal during ultrashort (fs) laser
pulse irradiation of silicon followed by vacuum expansion.
Time-resolved optical emission spectroscopy has been used to
characterize the plume expansion dynamics, while atomic force
microscopy analysis of silicon nanoparticles deposited after
100
laser ablation has shown an average particle size of
, with a pretty narrow size distribution. This
is in agreement with the predictions of recent theoretical models
on the mechanisms underlying ablation of solids in this ultrashort
temporal regime. Finally, a phenomenological model of
nanoparticles cooling during their vacuum expansion has allowed
us to single out radiative cooling as the most effective cooling
mechanism in the late stage of plume expansion.
PACS: 52.38.Mf – Laser ablation / 79.20.Ds – Laser-beam impact phenomena
© EDP Sciences, 2004
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