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Title: Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency

Abstract

Quasiballistic heat conduction from nanoscale heat sources of size comparable to phonon mean free paths has recently become of intense interest both scientifically and for its applications. Prior work has established that, in the quasiballistic regime, the apparent thermal properties of materials depend both on intrinsic mechanisms and the characteristics of the applied thermal gradient. However, many aspects of this regime remain poorly understood. Here, we experimentally study the thermal response of crystals to large thermal gradients generated by optical heating of nanoline arrays. Our experiments reveal the key role of the spatial frequencies and Fourier series amplitudes of the heating profile for thermal transport in the quasiballistic regime, in contrast to the conventional picture that focuses on the geometric dimensions of the individual heaters. As a result, our work provides the insight needed to rationally mitigate local hot spots in modern applications by manipulating the spatial frequencies of the heater patterns.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Boston College, Chestnut Hill, MA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1491348
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 10; Journal Issue: 5; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Xiangwen, Hua, Chengyun, Zhang, Hang, Ravichandran, Navaneetha K., and Minnich, Austin J. Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency. United States: N. p., 2018. Web. doi:10.1103/PhysRevApplied.10.054068.
Chen, Xiangwen, Hua, Chengyun, Zhang, Hang, Ravichandran, Navaneetha K., & Minnich, Austin J. Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency. United States. doi:10.1103/PhysRevApplied.10.054068.
Chen, Xiangwen, Hua, Chengyun, Zhang, Hang, Ravichandran, Navaneetha K., and Minnich, Austin J. Thu . "Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency". United States. doi:10.1103/PhysRevApplied.10.054068. https://www.osti.gov/servlets/purl/1491348.
@article{osti_1491348,
title = {Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency},
author = {Chen, Xiangwen and Hua, Chengyun and Zhang, Hang and Ravichandran, Navaneetha K. and Minnich, Austin J.},
abstractNote = {Quasiballistic heat conduction from nanoscale heat sources of size comparable to phonon mean free paths has recently become of intense interest both scientifically and for its applications. Prior work has established that, in the quasiballistic regime, the apparent thermal properties of materials depend both on intrinsic mechanisms and the characteristics of the applied thermal gradient. However, many aspects of this regime remain poorly understood. Here, we experimentally study the thermal response of crystals to large thermal gradients generated by optical heating of nanoline arrays. Our experiments reveal the key role of the spatial frequencies and Fourier series amplitudes of the heating profile for thermal transport in the quasiballistic regime, in contrast to the conventional picture that focuses on the geometric dimensions of the individual heaters. As a result, our work provides the insight needed to rationally mitigate local hot spots in modern applications by manipulating the spatial frequencies of the heater patterns.},
doi = {10.1103/PhysRevApplied.10.054068},
journal = {Physical Review Applied},
number = 5,
volume = 10,
place = {United States},
year = {2018},
month = {11}
}

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