Abstract
In view of its fundamental interest and relevance to nanoparticle film production, we have characterised the nanoparticle component of the ablation plume generated in femtosecond laser irradiation of metals. The results are compared to those of the ion plume, which is considered as representative of the atomic component. At moderate laser fluences, the angular distributions of both nanoparticle and ionic components were studied by measuring the spatial distribution of deposition on a transparent substrate and with a planar Langmuir probe, respectively. Our results show that both angular profiles of the plume components can be described by Anisimov model of isentropic expansion. As the laser fluence is increased above a value of several times the ablation threshold, the shape of the nanoparticle angular distribution progressively differs from the Anisimov prediction, contrary to what is observed for the ion component. This effect is interpreted in terms of the influence of the pressure exerted by the nascent atomic plasma plume on the initial hydrodynamic evolution of nanoparticle material.
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Donnelly, T., Lunney, J.G., Amoruso, S. et al. Angular distributions of plume components in ultrafast laser ablation of metal targets. Appl. Phys. A 100, 569–574 (2010). https://doi.org/10.1007/s00339-010-5877-8
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DOI: https://doi.org/10.1007/s00339-010-5877-8