Heat transfer across metal-dielectric interfaces involves transport of electrons and phonons accomplished either by coupling between phonons in metal and dielectric or by coupling between electrons in metal and phonons in dielectric. In this work, we investigate heat transfer across metal-dielectric interfaces during ultrafast-laser heating of thin metal films coated on dielectric substrates. By employing ultrafast-laser heating that creates strong thermal nonequilibrium between electrons and phonons in metal, it is possible to isolate the effect of the direct electron–phonon coupling across the interface and thus facilitate its study. Transient thermo-reflectance measurements using femtosecond laser pulses are performed on Au–Si samples while the simulation results based on a two-temperature model are compared with the measured data. A contact resistance between electrons in Au and phonons in Si represents the coupling strength of the direct electron–phonon interactions at the interface. Our results reveal that this contact resistance can be sufficiently small to indicate strong direct coupling between electrons in metal and phonons in dielectric.
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Research Papers
Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating
Liang Guo,
Liang Guo
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
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Stephen L. Hodson,
Stephen L. Hodson
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
Search for other works by this author on:
Timothy S. Fisher,
Timothy S. Fisher
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
Search for other works by this author on:
Xianfan Xu
Xianfan Xu
School of Mechanical Engineering and Birck Nanotechnology Center,
e-mail: xxu@purdue.edu
Purdue University
, West Lafayette, IN
47907
Search for other works by this author on:
Liang Guo
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
Stephen L. Hodson
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
Timothy S. Fisher
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907
Xianfan Xu
School of Mechanical Engineering and Birck Nanotechnology Center,
Purdue University
, West Lafayette, IN
47907e-mail: xxu@purdue.edu
J. Heat Transfer. Apr 2012, 134(4): 042402 (5 pages)
Published Online: February 13, 2012
Article history
Received:
May 18, 2011
Revised:
September 30, 2011
Online:
February 13, 2012
Published:
February 13, 2012
Citation
Guo, L., Hodson, S. L., Fisher, T. S., and Xu, X. (February 13, 2012). "Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating." ASME. J. Heat Transfer. April 2012; 134(4): 042402. https://doi.org/10.1115/1.4005255
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