Nanoparticles Formed in Picosecond Laser Argon Crystal Interaction

In this work, Molecular Dynamics simulations are conducted to attain thermal and mechanical characteristics of nanoparticles formed in laser materials interaction. It reveals that nanoparticles originate from intense vapor phase explosion. A gas-like structure is observed in nanoparticles in the iinitial stage of formation. After a short time of evolution, a typical liquid structure is revealed in particles. As a direct consequence of atoms escaping from the particle surface, the temperature of nanoparticles reduces to an under-cooling point from the initial super-heating state. Furthermore, it indicates that movements of nanoparticles are dominated by those normal to the target surface.

[1]  M. Shibahara,et al.  Quantum molecular dynamics study of light-to-heat absorption mechanism in atomic systems , 1998 .

[2]  Xianfan Xu,et al.  Molecular Dynamics Simulation of Heat Transfer and Phase Change During Laser Material Interaction , 2002 .

[3]  J. Etcheverry,et al.  Molecular dynamics simulation of the production of acoustic waves by pulsed laser irradiation , 1999 .

[4]  S. Anisimov,et al.  Electron emission from metal surfaces exposed to ultrashort laser pulses , 1974 .

[5]  Leonid V. Zhigilei,et al.  MOLECULAR DYNAMICS MODEL FOR LASER ABLATION AND DESORPTION OF ORGANIC SOLIDS , 1997 .

[6]  Etsuji Ohmura,et al.  Molecular Dynamics Simulation on Laser Ablation of fcc Metal , 1996 .

[7]  H.O. Jeschke,et al.  Theory for laser-induced ultrafast phase transitions in carbon , 1999 .

[8]  Leonid V. Zhigilei,et al.  Molecular dynamics simulation study of the fluence dependence of particle yield and plume composition in laser desorption and ablation of organic solids , 1999 .

[9]  Leonid V. Zhigilei,et al.  A Microscopic View of Laser Ablation , 1998 .

[10]  M. Parrinello,et al.  Ab initio molecular dynamics simulation of laser melting of graphite , 1998 .

[11]  Xianfan Xu,et al.  Nanoparticles Formed in Picosecond Laser Materials Interaction , 2002 .

[12]  S. Kotake,et al.  Molecular dynamics study of solid melting and vaporization by laser irradiation , 1993 .

[13]  Xianfan Xu,et al.  Molecular dynamics simulation of thermal and thermomechanical phenomena in picosecond laser material interaction , 2002 .

[14]  John R. Ray,et al.  Pulsed laser melting of silicon: A molecular dynamics study , 1987 .

[15]  Eleanor E. B. Campbell,et al.  Ultrashort pulse laser ablation of silicon: an MD simulation study , 1998 .

[16]  J. Banavar,et al.  Computer Simulation of Liquids , 1988 .

[17]  Landman,et al.  Superheating, melting, and annealing of copper surfaces. , 1993, Physical review letters.