TITLE

Pulse accumulation, radial heat conduction, and anisotropic thermal conductivity in pump-probe transient thermoreflectance

AUTHOR(S)
Schmidt, Aaron J.; Chen, Xiaoyuan; Chen, Gang
PUB. DATE
November 2008
SOURCE
Review of Scientific Instruments;Nov2008, Vol. 79 Issue 11, p114902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The relationship between pulse accumulation and radial heat conduction in pump-probe transient thermoreflectance (TTR) is explored. The results illustrate how pulse accumulation allows TTR to probe two thermal length scales simultaneously. In addition, the conditions under which radial transport effects are important are described. An analytical solution for anisotropic heat flow in layered structures is given, and a method for measuring both cross-plane and in-plane thermal conductivities of thermally anisotropic thin films is described. As verification, the technique is used to extract the cross-plane and in-plane thermal conductivities of highly ordered pyrolytic graphite. Results are found to be in good agreement with literature values.
ACCESSION #
35886476

 

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