Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy
Author(s)
Dennett, Cody Andrew; Short, Michael P
DownloadMain article after revisions (2.367Mb)
OPEN_ACCESS_POLICY
Open Access Policy
Creative Commons Attribution-Noncommercial-Share Alike
Terms of use
Metadata
Show full item recordAbstract
The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates quantitative analysis by convolving temperature dynamics with surface displacement dynamics. Thus, thermal transport characteristics are typically determined using the “amplitude grating” response to isolate the surface temperature dynamics. However, this signal character requires absolute heterodyne phase calibration and contains no elastic property information. Here, a method is developed by which phase grating TGS measurements may be consistently analyzed to determine thermal diffusivity with no prior knowledge of the expected properties. To demonstrate this ability, the wavelength-dependent 1D effective thermal diffusivity of pure germanium is measured using this type of response and found to be consistent with theoretical predictions made by solving the Boltzmann transport equation. This ability to determine the elastic and thermal properties from a single set of TGS measurements will be particularly advantageous for new in situ implementations of the technique being used to study dynamic materials systems.
Date issued
2018-06Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and EngineeringJournal
Journal of Applied Physics
Citation
Dennett, Cody A., and Michael P. Short. “Thermal Diffusivity Determination Using Heterodyne Phase Insensitive Transient Grating Spectroscopy.” Journal of Applied Physics 123, no. 21 (June 7, 2018): 215109.
Version: Author's final manuscript
ISSN
0021-8979
1089-7550