Molecular Dynamics Simulations of Femtosecond Laser Ablation and Spallation of Gold

Journal Article · Fri Oct 08 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3507095· OSTI ID:21454845

Demaske, Brian J; Zhakhovsky, Vasily V; Oleynik, Ivan I ^[1]; Inogamov, Nail A ^[2]

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1. Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)
2. Landau Institute for Theoretical Physics, RAS, Chernogolovka 142432 (Russian Federation)

The behavior of micron-sized gold films irradiated by a femtosecond laser is investigated via molecular dynamics simulations. The ultrafast laser heating induces a stress-confined state near the surface of the film. For sufficient laser fluences, decomposition of the stress-confined state leads to ablation of molten material in the frontal and spallation of crystalline solid at the rear sides of the sample. Simulations for thick films (>0.5 {mu}m) give distinct fluence thresholds for ablation and spallation of 137 and 193 mJ/cm{sup 2}, respectively, whereas for thin films only a single fracture process is observed. For thin films, it is shown that absorbed fluence at fracture threshold is a function of foil thickness. As foil thickness is decreased to the limit of very thin foils, the stress-confinement picture becomes increasingly less valid.

• OSTI ID: 21454845
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1278; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABLATION
CALCULATION METHODS
CHEMICAL REACTIONS
COMPUTERIZED SIMULATION
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
FAILURES
FILMS
FRACTURES
GOLD
HEATING
IRRADIATION
LASER RADIATION
LASER-RADIATION HEATING
METALS
MOLECULAR DYNAMICS METHOD
NUCLEAR REACTIONS
PLASMA HEATING
PULSED IRRADIATION
RADIATIONS
SHOCK WAVES
SIMULATION
SOLIDS
SPALLATION
STRESSES
SURFACES
THIN FILMS
TRANSITION ELEMENTS