Multidimensional quasiballistic thermal transport in transient grating spectroscopy
- Creators
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Minnich, A. J.
Abstract
Transient grating spectroscopy has emerged as a useful technique to study thermal phonon transport because of its ability to perform thermal measurements over length scales comparable to phonon mean free path (MFPs). Although several prior works have performed theoretical studies of quasiballistic heat conduction in transient grating, the analysis methods are either restricted to one spatial dimension or require phenomenological fitting parameters. Here, we analyze quasiballistic transport in a two-dimensional transient grating experiment in which heat conduction can occur both in and cross plane using an analytic Green's function of the Boltzmann equation we recently reported that is free of fitting parameters. We demonstrate a method by which phonon MFPs can be extracted from these measurements, thereby extending the MFP spectroscopy technique using transient grating to opaque bulk materials.
Additional Information
© 2015 American Physical Society. Received 5 June 2015; Revised manuscript received 14 July 2015; Published 13 August 2015. The author thanks J. Carrete and N. Mingo for providing the first-principles data for Si. This work was sponsored, in part, by the National Science Foundation under Grant No. CBET CAREER 1254213 and by Boeing under the Boeing-Caltech Strategic Research & Development Relationship Agreement.Attached Files
Published - PhysRevB.92.085203.pdf
Submitted - 1506.03149v1.pdf
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Additional details
- Eprint ID
- 60060
- Resolver ID
- CaltechAUTHORS:20150903-152955651
- NSF CBET CAREER
- 1254213
- Boeing-Caltech Strategic Research & Development Relationship Agreement
- Created
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2015-09-04Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field