Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire
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 Four...
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| Format: | Article |
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ASME International
2018
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| Online Access: | http://hdl.handle.net/1721.1/119200 https://orcid.org/0000-0002-3968-8530 |
| _version_ | 1811089399618732032 |
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| author | Minnich, Austin Jerome Chen, Gang |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Minnich, Austin Jerome Chen, Gang |
| author_sort | Minnich, Austin Jerome |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T14:18:34Z |
| format | Article |
| id | mit-1721.1/119200 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:18:34Z |
| publishDate | 2018 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/1192002022-10-01T20:32:51Z Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire Minnich, Austin Jerome Chen, Gang Massachusetts Institute of Technology. Department of Mechanical Engineering Minnich, Austin Jerome Chen, Gang 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. 2018-11-19T18:50:09Z 2018-11-19T18:50:09Z 2011-03 2018-11-06T18:25:14Z Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-3892-1 http://hdl.handle.net/1721.1/119200 Minnich, Austin, and Gang Chen. “Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire.” ASME/JSME 2011 8th Thermal Engineering Joint Conference (2011). https://orcid.org/0000-0002-3968-8530 http://dx.doi.org/10.1115/AJTEC2011-44094 ASME/JSME 2011 8th Thermal Engineering Joint Conference 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. application/pdf ASME International ASME |
| spellingShingle | Minnich, Austin Jerome Chen, Gang Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title | Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title_full | Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title_fullStr | Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title_full_unstemmed | Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title_short | Quasi-Ballistic Heat Transfer From Metal Nanostructures on Sapphire |
| title_sort | quasi ballistic heat transfer from metal nanostructures on sapphire |
| url | http://hdl.handle.net/1721.1/119200 https://orcid.org/0000-0002-3968-8530 |
| work_keys_str_mv | AT minnichaustinjerome quasiballisticheattransferfrommetalnanostructuresonsapphire AT chengang quasiballisticheattransferfrommetalnanostructuresonsapphire |