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Research Papers: Micro/Nanoscale Heat Transfer

An Interfacial Tracking Method for Ultrashort Pulse Laser Melting and Resolidification of a Thin Metal Film

[+] Author and Article Information
Yuwen Zhang1

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211zhangyu@missouri.edu

J. K. Chen

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211

1

Corresponding author.

J. Heat Transfer 130(6), 062401 (Apr 23, 2008) (10 pages) doi:10.1115/1.2891159 History: Received December 29, 2006; Revised September 10, 2007; Published April 23, 2008

An interfacial tracking method was developed to model rapid melting and resolidification of a freestanding metal film subject to an ultrashort laser pulse. The laser energy was deposited to the electrons near thin film surface, and subsequently diffused into a deeper part of the electron gas and transferred to the lattice. The energy equations for the electron and lattice were coupled through an electron-lattice coupling factor. Melting and resolidification were modeled by considering the interfacial energy balance and nucleation dynamics. An iterative solution procedure was employed to determine the elevated melting temperature and depressed solidification temperature in the ultrafast phase-change processes. The predicted surface lattice temperature, interfacial location, interfacial temperature, and interfacial velocity were compared with those obtained by an explicit enthalpy model. The effects of the electron thermal conductivity models, ballistic range, and laser fluence on the melting and resolidification were also investigated.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

Effect of electron thermal conductivities on the surface lattice temperatures and the interfacial locations

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Figure 7

Effect of electron thermal conductivities on the interfacial temperatures and velocities

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Figure 8

Temperature and electron thermal conductivity distributions (t=15ps)

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Figure 10

Effect of ballistic range on the interfacial temperatures and velocities

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Figure 11

Effect of ballistic range on the electron and lattice temperature distributions (t=15ps)

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Figure 12

Effect of laser fluence on the surface lattice temperatures and the interfacial locations (tp=20ps)

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Figure 1

Laser melting of thin film

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Figure 3

Comparison of surface lattice temperatures and interfacial locations

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Figure 4

Comparison of interfacial temperatures and velocities

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Figure 5

Comparison of lattice temperature distributions

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Figure 9

Effect of ballistic range on the surface lattice temperatures and the interfacial locations

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Figure 13

Effect of laser fluence on the interfacial temperatures and velocities (tp=20ps)

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