Molecular dynamics simulation of cluster formation in femtosecond laser ablation

Daiki Hatomi, Naofumi Ohnishi, Masaharu Nishikino

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Short-period laser ablation of a platinum solid target was investigated through three-dimensional classical molecular dynamics simulations using the embedded atom method potential. The platinum target was ablated by an ultrashort-pulse laser with three different fluences near the ablation threshold and single 100-fs pulse. Although each laser fluence causes melting and evaporation of the target surface, ablation processes are morphologically different. When the laser fluence is just above the ablation threshold, the surface layer of the solid target breaks away, and so-called spallation occurs. With the moderate laser fluence, homogeneous nucleation of nano-sized clusters takes place in the liquidized layer at the surface, resulting in the homogenization in the emitted cluster size, while the surface layer fragments and vaporizes with the higher fluence. Moreover, in the spallation regime, the recreated surface has nano-sized roughness and is formed after the surface oscillates with a ∼20-ns period. This inherent roughness formation may be a seed of the nano-sized regular structure observed by past experiments with repetitive pulses.

Original languageEnglish
Title of host publicationX-Ray Lasers and Coherent X-Ray Sources
Subtitle of host publicationDevelopment and Applications X
PublisherSPIE
ISBN (Print)9780819496997
DOIs
Publication statusPublished - 2013 Jan 1
EventX-Ray Lasers and Coherent X-Ray Sources: Development and Applications X Conference - San Diego, CA, United States
Duration: 2013 Aug 272013 Aug 29

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8849
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherX-Ray Lasers and Coherent X-Ray Sources: Development and Applications X Conference
CountryUnited States
CitySan Diego, CA
Period13/8/2713/8/29

Keywords

  • Classical molecular dynamics
  • Femtosecond laser pulse
  • Laser ablation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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