Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals
Abstract Laser ablation is often simulated by the two-temperature model in which electrons are assumed to be thermalized by laser irradiation, while an explicit representation of interaction between laser-field and electrons is challenging but beneficial as being free from any adjustable parameters....
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2021-07-01
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Online Access: | https://doi.org/10.1038/s41598-021-94036-4 |
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doaj-1a633f4e976a4291bf1192880038d37b2021-07-18T11:25:39ZengNature Publishing GroupScientific Reports2045-23222021-07-011111810.1038/s41598-021-94036-4Direct treatment of interaction between laser-field and electrons for simulating laser processing of metalsYoshiyuki Miyamoto0Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST)Abstract Laser ablation is often simulated by the two-temperature model in which electrons are assumed to be thermalized by laser irradiation, while an explicit representation of interaction between laser-field and electrons is challenging but beneficial as being free from any adjustable parameters. Here, an ab initio method based on the time-dependent density functional theory (TDDFT) in which electron-ion dynamics under a laser field are numerically simulated is examined as a tool for simulating femtosecond laser processing of metals. Laser-induced volume expansion in surface normal directions of Cu(111) and Ni(111) surfaces are simulated by using repeating slab models. The amount of simulated volume expansion is compared between Cu(111) and Ni(111) slabs for the same laser pulse conditions, and the Ni slab is found to expand more than the Cu slab despite the smaller thermal expansion coefficient of Ni compared with Cu. The analyzed electronic excitation and lattice motion were compared to those in the two-temperature model. The threshold fluence to release surface Cu atom deduced from current TDDFT approach is found to be comparable to those of Cu ablation reported experimentally.https://doi.org/10.1038/s41598-021-94036-4 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yoshiyuki Miyamoto |
spellingShingle |
Yoshiyuki Miyamoto Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals Scientific Reports |
author_facet |
Yoshiyuki Miyamoto |
author_sort |
Yoshiyuki Miyamoto |
title |
Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
title_short |
Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
title_full |
Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
title_fullStr |
Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
title_full_unstemmed |
Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
title_sort |
direct treatment of interaction between laser-field and electrons for simulating laser processing of metals |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2021-07-01 |
description |
Abstract Laser ablation is often simulated by the two-temperature model in which electrons are assumed to be thermalized by laser irradiation, while an explicit representation of interaction between laser-field and electrons is challenging but beneficial as being free from any adjustable parameters. Here, an ab initio method based on the time-dependent density functional theory (TDDFT) in which electron-ion dynamics under a laser field are numerically simulated is examined as a tool for simulating femtosecond laser processing of metals. Laser-induced volume expansion in surface normal directions of Cu(111) and Ni(111) surfaces are simulated by using repeating slab models. The amount of simulated volume expansion is compared between Cu(111) and Ni(111) slabs for the same laser pulse conditions, and the Ni slab is found to expand more than the Cu slab despite the smaller thermal expansion coefficient of Ni compared with Cu. The analyzed electronic excitation and lattice motion were compared to those in the two-temperature model. The threshold fluence to release surface Cu atom deduced from current TDDFT approach is found to be comparable to those of Cu ablation reported experimentally. |
url |
https://doi.org/10.1038/s41598-021-94036-4 |
work_keys_str_mv |
AT yoshiyukimiyamoto directtreatmentofinteractionbetweenlaserfieldandelectronsforsimulatinglaserprocessingofmetals |
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1721296201091907584 |