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Research Papers: Micro/Nanoscale Heat Transfer

Size Effects During Femtosecond Laser Interaction With Nanosized Metal Particles

[+] Author and Article Information
Jing Huang

Yuwen Zhang1

J. K. Chen

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

1

Corresponding author.

J. Heat Transfer 134(1), 012401 (Nov 21, 2011) (7 pages) doi:10.1115/1.4004814 History: Received February 12, 2011; Accepted July 26, 2011; Published November 21, 2011; Online November 21, 2011

To obtain more in-depth knowledge about the microscopic process during laser sintering, phase change processes including melting, evaporation, and resolidification during the irradiation of femtosecond laser on nanosized gold particles were simulated. The effects of multiple reflections and pulse energy overlapping in small particle size were considered. The results show that when the particle size is big enough, the simulation results match those of old model. When the particle size is small and laser fluence is high, no resolidification takes place in the time range of the simulation. The laser fluence range to achieve partial melting is narrow when the particle is small. When the diameter is smaller than 400 nm, temperature gradient during the heating period is ignorable, which is different from the large particles. The threshold value of laser fluence to achieve vaporization is about two times higher than that of melting with the same particle size.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical model for ultrafast phase change

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Figure 2

Laser interaction with nanosized metal particle

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Figure 3

Energy balance with different particle size

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Figure 4

Melting process when r0  = 200 nm

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Figure 5

Threshold values of laser fluence

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Figure 6

Temperature profile for particle radius of 100 nm

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Figure 7

Threshold value of laser fluence for vaporization

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Figure 8

Relationship of melting and vaporization under different particle size

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