The mechanism of nanobump formation in femtosecond pulse laser nanostructuring of thin metal films |
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Authors: | Dmitriy S Ivanov Baerbel Rethfeld Gerard M O’Connor Thomas J Glynn Alexey N Volkov Leonid V Zhigilei |
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Institution: | (1) Physics Department, Technical University of Kaiserslautern, Erwin Schroedinger Str. 46, 67663 Kaiserslautern, Germany;(2) National Centre for Laser Applications, Physics Department, National University of Ireland, Galway, Ireland;(3) Department of Materials Science and Engineering, University of Virginia, 395 McCormick Road, Charlottesville, VA 22904-4745, USA |
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Abstract: | The physical mechanisms responsible for the formation of nanobump structures on a surface of a thin metal film irradiated
by a tightly focused femtosecond laser pulse are investigated in a large-scale molecular dynamics simulation. The simulation
is performed with a combined atomistic-continuum model adapted for an adequate representation of laser-induced processes at
the length-scale of the entire laser spot. The relaxation of the compressive stresses generated by the fast laser heating
is identified as the main driving force responsible for the separation of the metal film from the substrate and formation
of the nanobump. The kinetics of the transient melting and resolidification, occurring under conditions of the fast cooling
due to the two-dimensional electron heat conduction, defines the shape of the nanobump. The predictions of the simulation
are related to the surface structures observed in femtosecond laser nanostructuring. |
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Keywords: | PACS" target="_blank">PACS 61 80 Az 02 70 Ns 64 70 D- |
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