Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 20, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4967384
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Science [DE-FG02-06ER46343]
- National Science Foundation [CBET-1235975, CBET-1603761]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1603761] Funding Source: National Science Foundation
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Heat transfer between two objects separated by a nanoscale vacuum gap holds great promise especially in energy harvesting applications such as near-field thermophotovoltaic systems. However, experimental validation of nanoscale radiative heat transfer has been largely limited to tip-plate configurations due to challenges of maintaining small gap spacing over a relatively large area. Here, we report measurements of heat transfer near room temperature between two 1 cm by 1 cm doped-Si parallel plates, separated by a vacuum gap from about 200 nm to 780 nm. The measured strong near-field radiative transfer is in quantitative agreement with the theoretical prediction based on fluctuational electrodynamics. The largest measured radiative heat flux is 11 times as high as the blackbody limit for the same hot and cold surface temperatures. Our experiments have produced the highest radiative heat transfer rate observed to date across submicron distances between objects near room temperature. Published by AIP Publishing.
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