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Title: Thermal properties of thin films studied by ultrafast laser spectroscopy: Theory and experiment
Authors: Poletkin, Kirill V.
Gurzadyan, Gagik G.
Shang, Jingzhi
Kulish, Vladimir
Keywords: Ultrafast laser spectroscopy
Thermal properties
Thin films
Heat transfer
Issue Date: 2014
Source: Poletkin, K. V., Gurzadyan, G. G., Shang, J., & Kulish, V. (2014). Thermal properties of thin films studied by ultrafast laser spectroscopy: Theory and experiment. International Journal of Heat and Mass Transfer, 77, 17-21.
Series/Report no.: International Journal of Heat and Mass Transfer
Abstract: The one-dimensional non-homogeneous hyperbolic energy equation within a semi-infinite domain, applied to pump–probe transient reflectance measurements for subpicosecond and picosecond laser pulses was studied. The result of this study is an analytical model in the form of a Volterra-type integral equation that describes the surface temperature response of the thin film induced by an ultra-short laser pulse and takes into account contributions of the transient heat flux and the volumetric heat source. The criterion based on dimensionless time ξp = t/2τ (where τ is the relaxation time of phonons due to collisions) is introduced, in order to predict the temperature response caused by the surface heat flux and/or volumetric source. This analytical solution is validated by using experimental pump–probe transient reflectance measurements of thin gold with a time resolution of 50 fs. A good agreement between the experimental results and the theoretical model is found.
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2014.04.054
Schools: School of Mechanical and Aerospace Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2014 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by International Journal of Heat and Mass Transfer, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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