Non-diffusive relaxation of a transient thermal grating analyzed with the Boltzmann transport equation
Abstract
The relaxation of an one-dimensional transient thermal grating (TTG) in a medium with phonon-mediated thermal transport is analyzed within the framework of the Boltzmann transport equation (BTE), with the goal of extracting phonon mean free path (MFP) information from TTG measurements of non-diffusive phonon transport. Both gray-medium (constant MFP) and spectrally dependent MFP models are considered. In the gray-medium approximation, an analytical solution is derived. For large TTG periods compared to the MFP, the model yields an exponential decay of grating amplitude with time in agreement with Fourier's heat diffusion equation, and at shorter periods, phonon transport transitions to the ballistic regime, with the decay becoming strongly non-exponential. Spectral solutions are obtained for Si and PbSe at 300 K using phonon dispersion and lifetime data from density functional theory calculations. The spectral decay behaviors are compared to several approximate models: a single MFP solution, a frequency-integrated gray-medium model, and a “two-fluid” BTE solution. We investigate here the utility of using the approximate models for the reconstruction of phonon MFP distributions from non-diffusive TTG measurements.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1161968
- Grant/Contract Number:
- SC0001299; FG02-09ER46577
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 114; Journal Issue: 10; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Collins, Kimberlee C., Maznev, Alexei A., Tian, Zhiting, Esfarjani, Keivan, Nelson, Keith A., and Chen, Gang. Non-diffusive relaxation of a transient thermal grating analyzed with the Boltzmann transport equation. United States: N. p., 2013.
Web. doi:10.1063/1.4820572.
Collins, Kimberlee C., Maznev, Alexei A., Tian, Zhiting, Esfarjani, Keivan, Nelson, Keith A., & Chen, Gang. Non-diffusive relaxation of a transient thermal grating analyzed with the Boltzmann transport equation. United States. https://doi.org/10.1063/1.4820572
Collins, Kimberlee C., Maznev, Alexei A., Tian, Zhiting, Esfarjani, Keivan, Nelson, Keith A., and Chen, Gang. Tue .
"Non-diffusive relaxation of a transient thermal grating analyzed with the Boltzmann transport equation". United States. https://doi.org/10.1063/1.4820572. https://www.osti.gov/servlets/purl/1161968.
@article{osti_1161968,
title = {Non-diffusive relaxation of a transient thermal grating analyzed with the Boltzmann transport equation},
author = {Collins, Kimberlee C. and Maznev, Alexei A. and Tian, Zhiting and Esfarjani, Keivan and Nelson, Keith A. and Chen, Gang},
abstractNote = {The relaxation of an one-dimensional transient thermal grating (TTG) in a medium with phonon-mediated thermal transport is analyzed within the framework of the Boltzmann transport equation (BTE), with the goal of extracting phonon mean free path (MFP) information from TTG measurements of non-diffusive phonon transport. Both gray-medium (constant MFP) and spectrally dependent MFP models are considered. In the gray-medium approximation, an analytical solution is derived. For large TTG periods compared to the MFP, the model yields an exponential decay of grating amplitude with time in agreement with Fourier's heat diffusion equation, and at shorter periods, phonon transport transitions to the ballistic regime, with the decay becoming strongly non-exponential. Spectral solutions are obtained for Si and PbSe at 300 K using phonon dispersion and lifetime data from density functional theory calculations. The spectral decay behaviors are compared to several approximate models: a single MFP solution, a frequency-integrated gray-medium model, and a “two-fluid” BTE solution. We investigate here the utility of using the approximate models for the reconstruction of phonon MFP distributions from non-diffusive TTG measurements.},
doi = {10.1063/1.4820572},
journal = {Journal of Applied Physics},
number = 10,
volume = 114,
place = {United States},
year = {Tue Sep 10 00:00:00 EDT 2013},
month = {Tue Sep 10 00:00:00 EDT 2013}
}
Web of Science
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