Emission of nanoparticles during ultrashort laser irradiation of silicon targets

被引：42

作者：

Amoruso, S

Bruzzese, R

Spinelli, N

Velotta, R

Vitiello, M

Wang, X

机构：

[1] Univ Naples Federico 2, INFM, I-80126 Naples, Italy

[2] Univ Naples Federico 2, Dipartimento Sci Fisiche, I-80126 Naples, Italy

来源：

EUROPHYSICS LETTERS | 2004年 / 67卷 / 03期

关键词：

D O I：

10.1209/epl/i2004-10080-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 fs laser ablation has shown an average particle size of approximate to7 nm, 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.

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页码：404 / 410

页数：7

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