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Research Papers: Heat and Mass Transfer

Electron–Phonon Coupled Heat Transfer and Thermal Response Induced by Femtosecond Laser Heating of Gold

[+] Author and Article Information
Pengfei Ji

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

Yuwen Zhang

Fellow ASME
Department of Mechanical and
Aerospace Engineering,
University of Missouri,
Columbia, MO 65211
e-mail: zhangyu@missouri.edu

1Corresponding author.

Presented a the 2016 ASME 5th Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6428.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 26, 2016; final manuscript received October 5, 2016; published online February 7, 2017. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 139(5), 052001 (Feb 07, 2017) (6 pages) Paper No: HT-16-1309; doi: 10.1115/1.4035248 History: Received May 26, 2016; Revised October 05, 2016

Ab initio simulation is one of the most effective theoretical tools to study the electrons evolved heat transfer process. Here, we report the use of finite-temperature density functional theory (DFT) to investigate the electron thermal excitation, electron–phonon coupled heat transfer, and the corresponding thermal response induced by energy deposition of femtosecond laser pulse in gold. The calculated results for cases with different scales of electron excitations demonstrate significant electron temperature dependence of electron heat capacity and electron–phonon coupling factor. Bond hardening of laser-irradiated gold and structural variation from solid to liquid are observed. The obtained results shed light upon the ultrafast microscopic processes of thermal energy transport from electron subsystem to lattice subsystem and serve for an improved interpretation of femtosecond laser–metal interaction.

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Figures

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Fig. 1

Responses of the lattice temperature Tl during and after femtosecond laser heating with electron temperature Te at 10,000 K, 30,000 K, and 50,000 K from 0 to 96.76 fs, respectively

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Fig. 2

(a) Fermi–Dirac distribution function f and (b) electron density of states g for electrons temperature Te at 300 K, 10,000 K, 30,000 K, and 50,000 K. The black dots in (a) denote the location of chemical potential μ minus Fermi energy εF, at a given electron temperature Te.

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Fig. 3

The electron–phonon spectral function α2F(ω) for Te at 300 K, 10,000 K, 30,000 K, and 50,000 K. The experimental result from Ref. [43] is added for comparison.

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Fig. 4

Mean square displacement (MSD) of the cases at electron temperature Te 10,000 K (a), 30,000 K (b), and 50,000 K (c), respectively. The red curves in the inset show the mean square displacements before melting (based on the Lindemann's criterion: 0.0419 Å2). The femtosecond laser heating lasts from 0 to 0–96.76 fs.

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Fig. 5

Radial distribution function (RDF) of the cases at electron temperature Te 10,000 K (a), 30,000 K (b), and 50,000 K (c), respectively. The femtosecond laser heating lasts from 0 to 0–96.76 fs.

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