Numerical study of laser ablation regimes of thin gold films in an aqueous environment
S. Yu. Lukashenko1, A. A. Fronya2, E. I. Mavreshko2, M. S. Grigorieva2, D. S. Ivanov2, I. N. Zavestovskaya2,3
1Institute for Analytical Instrumentation of the Russian Academy of Sciences, Saint Petersburg, Russia
2Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
3National Research Center “Kurchatov Institute”, Moscow, Russia
Email: lukashenko13@mail.ru
This work investigates the mechanisms of laser ablation of a thin gold layer deposited on glass in an aqueous environment as a function of laser pulse energy in the range of 0.5-2.0 J/cm2. The study is performed using the molecular dynamics method, which enables the analysis of the kinetics of nonequilibrium processes at the atomic level. The absorbed laser pulse energy values are determined for a 20 nm thick gold film irradiated by a 1 ps pulse, corresponding to the realization of ablation regimes such as spallation, phase explosion, or their combination. The results of this work are relevant for the development of methods and technologies for surface nanostructuring and the synthesis of metallic nanostructures using short-pulse laser radiation. Keywords: Thin films, laser ablation in water, molecular dynamics, numerical simulation.
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