Abstract
The possibility of material surfaces restructuring on the nanoscale due to ultrashort laser pulses has recently found a number of practical applications. It was found experimentally that under spatial confinement due to a liquid layer atop the surface, one can achieve even finer and cleaner structures as compared to that in air or in vacuum. The mechanism of the materials restructuring under the liquid confinement, however, is not clear and its experimental study is limited by the extreme conditions realized during the intense and localized laser energy deposition that takes place on nanometer spatial and picosecond time-scales. In this theoretical work, we suggest a molecular dynamics-based approach that is capable of simulating the processes of periodic nanostructuring with ultrashort UV laser pulse on metals. The theoretical results of the simulations are directly compared with the experimental data on the same spatial and temporal scales.
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Acknowledgements
The presented work is completed under financial support of grants of the German Science Foundation DFG grants IV 122/1-1, IV 122/1-2, IH 17/18-1, RE 1141/14-1, RE 1141/14-2, RE 1141/15, GA 465/15-1, GA 465/18-1 and GA 465/15-2. The MD simulations were performed at Lichtenberg Super Computer Facility TU-Darmstadt.
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Ivanov, D.S., Blumenstein, A., Ihlemann, J. et al. Molecular dynamics modeling of periodic nanostructuring of metals with a short UV laser pulse under spatial confinement by a water layer. Appl. Phys. A 123, 744 (2017). https://doi.org/10.1007/s00339-017-1372-9
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DOI: https://doi.org/10.1007/s00339-017-1372-9