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Influence of the Probe Laser Wavelength in Transient Reflectance Measurement of Gold

[+] Author Affiliations
Liang Guo, Xianfan Xu

Purdue University, West Lafayette, IN

Paper No. IMECE2014-38103, pp. V08BT10A049; 3 pages
doi:10.1115/IMECE2014-38103
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

Transient reflectance of gold is measured with ultrafast spectroscopy by tunable probe wavelength. The influence of the probe wavelength on the signal is analyzed. It is found that when probed around 490 nm the signal is most sensitive to electron excitation and there is a simple linear relation between the reflectance change and the electron temperature change after sufficiently weak excitation. The two-temperature model is applied to calculate the electron-phonon coupling factor by fitting the transient reflectance signal.

Copyright © 2014 by ASME

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