Transient reflectance of gold was measured using ultrafast spectroscopy by varying the wavelength of the probe laser beam in the visible range. Based on the band structure of gold, the influence of the probe beam wavelength on the signal trend is analyzed in terms of sensitivity, effect of nonthermalized electrons, and relaxation rate. It is found that probing around 490 nm renders the best sensitivity and a simple linear relation between the transient reflectance and the electron temperature. The two-temperature model (TTM) is applied to calculate the electron-phonon coupling factor by fitting the transient reflectance signal. This work clarifies the ultrafast energy transfer dynamics in gold and the importance of using proper probe laser wavelength for modeling the transient heat transfer process in metal.
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December 2014
Research-Article
Ultrafast Spectroscopy of Electron-Phonon Coupling in Gold
Liang Guo
,
Liang Guo
School of Mechanical Engineering and Birck
Nanotechnology Center,
Nanotechnology Center,
Purdue University
,West Lafayette, IN 47907
Search for other works by this author on:
Xianfan Xu
Xianfan Xu
1
School of Mechanical Engineering and Birck
Nanotechnology Center,
e-mail: xxu@purdue.edu
Nanotechnology Center,
Purdue University
,West Lafayette, IN 47907
e-mail: xxu@purdue.edu
1Corresponding author.
Search for other works by this author on:
Liang Guo
School of Mechanical Engineering and Birck
Nanotechnology Center,
Nanotechnology Center,
Purdue University
,West Lafayette, IN 47907
Xianfan Xu
School of Mechanical Engineering and Birck
Nanotechnology Center,
e-mail: xxu@purdue.edu
Nanotechnology Center,
Purdue University
,West Lafayette, IN 47907
e-mail: xxu@purdue.edu
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 26, 2014; final manuscript received September 4, 2014; published online September 30, 2014. Assoc. Editor: Robert D. Tzou.
J. Heat Transfer. Dec 2014, 136(12): 122401 (6 pages)
Published Online: September 30, 2014
Article history
Received:
June 26, 2014
Revision Received:
September 4, 2014
Citation
Guo, L., and Xu, X. (September 30, 2014). "Ultrafast Spectroscopy of Electron-Phonon Coupling in Gold." ASME. J. Heat Transfer. December 2014; 136(12): 122401. https://doi.org/10.1115/1.4028543
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