Abstract
A mechanism of the formation of a nanotip with a nanoparticle at its top that appears in a thin metal film irradiated by a single femtosecond laser pulse has been studied experimentally and theoretically. It has been found that the nanotip appears owing to a melt flow and a nanojet formation, which is cooled and solidified. Within a proposed hydrodynamic model, the development of thermocapillary instability in the melted film is treated with the use of the Kuramoto-Sivashinsky-type hydrodynamic equation. The simulation shows that the nanojet nucleates in the form of a nanopeak in a pit on the top of a microbump (linear stage) and, then, grows in a nonlinear (explosive) regime of an increase in thermocapillary instability in good agreement with experimental data.
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Original Russian Text © V.I. Emel’yanov, D.A. Zayarniy, A.A. Ionin, I.V. Kiseleva, S.I. Kudryashov, S.V. Makarov, T.H.T. Nguyen, A.A. Rudenko, 2014, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 99, No. 9, pp. 601–605.
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Emel’yanov, V.I., Zayarniy, D.A., Ionin, A.A. et al. Nanoscale hydrodynamic instability in a molten thin gold film induced by femtosecond laser ablation. Jetp Lett. 99, 518–522 (2014). https://doi.org/10.1134/S0021364014090057
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DOI: https://doi.org/10.1134/S0021364014090057