Microscopic mechanism of ultrashort-pulse laser ablation of metals: a molecular dynamics study incorporating electronic entropy effects

The microscopic mechanism of metal ablation induced by ultrashort laser pulse irradiation is investigated. A two-temperature model scheme combined with molecular dynamics (TTM-MD) is developed to incorporate electronic entropy effects into the simulation of metal ablation while satisfying the energy...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2023-09, Vol.56 (38), p.385310
Main Authors: Tanaka, Yuta, Tsuneyuki, Shinji
Format: Article
Language:English
Subjects:
electronic entropy
laser ablation
metal
molecular dynamics
ultrashort-pulse
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Summary:The microscopic mechanism of metal ablation induced by ultrashort laser pulse irradiation is investigated. A two-temperature model scheme combined with molecular dynamics (TTM-MD) is developed to incorporate electronic entropy effects into the simulation of metal ablation while satisfying the energy conservation law. Simulation with the TTM-MD scheme reveals that ultrashort laser pulse irradiation near the ablation threshold causes high-energy atom/ion emission and sub-nanometer depth ablation, as observed experimentally, due to the electronic entropy effect. It is also shown that the electronic entropy effect is also significant in spallation.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/acdb81