Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms12900
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Funding
- National Science Foundation [CBET-1253577]
- Undergraduate Research Opportunities Program (UROP) at the University of Utah
- Utah Science Technology and Research (USTAR) initiative of the State of Utah
- College of Engineering, Office of the Vice President for Research
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1253577] Funding Source: National Science Foundation
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Using Rytov's fluctuational electrodynamics framework, Polder and Van Hove predicted that radiative heat transfer between planar surfaces separated by a vacuum gap smaller than the thermal wavelength exceeds the blackbody limit due to tunnelling of evanescent modes. This finding has led to the conceptualization of systems capitalizing on evanescent modes such as thermophotovoltaic converters and thermal rectifiers. Their development is, however, limited by the lack of devices enabling radiative transfer between macroscale planar surfaces separated by a nanosize vacuum gap. Here we measure radiative heat transfer for large temperature differences (similar to 120 K) using a custom-fabricated device in which the gap separating two 5 x 5mm(2) intrinsic silicon planar surfaces is modulated from 3,500 to 150 nm. A substantial enhancement over the blackbody limit by a factor of 8.4 is reported for a 150-nm-thick gap. Our device paves the way for the establishment of novel evanescent wave-based systems.
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