Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire
Name
t30071_1.pdf
Size
257.87 KB
Format
Adobe PDF
Checksum (MD5)
634bda689eccb34cba993f47d6172b9b
Author(s)
Minnich, Austin Jerome
Chen, Gang
Date Issued
March 2011
Journal
ASME/JSME 2011 8th Thermal Engineering Joint Conference
Publisher
ASME International
Citation
Minnich, Austin, and Gang Chen. “Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire.” ASME/JSME 2011 8th Thermal Engineering Joint Conference (2011).
Version
Final published version
Abstract
Quasi-ballistic phonon transport, where heat transfer does not obey Fourier's law, occurs when length scales become comparable to the phonon mean free path (MFP). Understanding this regime of heat transport is of fundamental interest, as the manner in which the heat transport deviates from Fourier's law reveals important information about the phonon mean free path distribution. While ultrafast techniques can provide the time resolution to observe heat transfer in this regime, the minimum size of the heated region is restricted by diffraction to approximately 1 μm, which is larger than phonon MFPs in many materials. To circumvent this limit, we study heat transfer from metallic dot arrays with sub-micron diameters on sapphire fabricated using electron beam lithography. We describe heat transfer models which allow us to determine how the heat transfer in sapphire deviates from Fourier's law at these small length scales. Our results indicate that quasi-ballistic transport occurs in sapphire when length scales are on the order of hundreds of nanometers.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1115/AJTEC2011-44094
