Citation: BAI Ming-Ze, CHENG Li, TANG Hong, DOU Yu-Sheng. Molecular Dynamics Simulation of the Laser-Induced Melting of an Al Nanofilm[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3143-3149. doi: 10.3866/PKU.WHXB20101224 shu

Molecular Dynamics Simulation of the Laser-Induced Melting of an Al Nanofilm

BAI Ming-Ze ¹ ,
CHENG Li ¹ ,
TANG Hong ¹ ,
DOU Yu-Sheng ^1,2,

1.
1. Institue of Computational Chemistry, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China;
2. Department of Physical Sciences, Nicholls State University, LA 70310, USA

Received Date: 22 July 2010
Available Online: 10 November 2010
Fund Project: 国家自然科学基金(20773618, 21073242) (20773618, 21073242)重庆邮电大学自然科学基金(A2008-39)资助项目 (A2008-39)

A coupled computational technique, which combines the one dimensional two-temperature model and molecular dynamics, was used to study the melting dynamics of a nanoscale aluminum film irradiated by a femtosecond laser pulse. The model is capable of providing an atomic-level depiction of fast microscale processes in metals and gives an adequate description of laser light absorption, energy transfer, and fast electron heat conduction in metals. The simulation revealed that the electron temperature, lattice temperature, and laser induced pressure of the Al film were significantly different from those of Ni and Au films. The Al film melts globally soon after laser radiation and this is different from the Ni film, which es through a step melting process. In addition, the Al film shows a much faster melting process than the Ni and Au films because of strong electron-phonon coupling. The melting time of the Al film by an ultrafast laser pulse is consistent with recent experimental observations, which supports the assertion that the laser induced melting of an Al film is a thermal process.
- Metal Al,
- Laser melting,
- Two-temperature model,
- Ultrafast dynamics,
- Thermal melting
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