Enhancement and saturation of near-field radiative heat transfer in nanogaps between metallic surfaces
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical SocietyDate
2022-09-29Citation
10.1103/PhysRevLett.129.145901
Physical Review Letters 129.14 (2022): 145901
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.129.145901Project
Gobierno de España. PID2020-114880GB-I00Editor's Version
https://doi.org/10.1103/PhysRevLett.129.145901Subjects
Electrodynamics; Heat Transfer; Metals; Radiative Transfer; Surface Measurement; FísicaRights
© 2022 American Physical SocietyAbstract
Near-field radiative heat transfer (NFRHT) between planar metallic surfaces was computationally explored over five decades ago by Polder and van Hove [Phys. Rev. B 4, 3303 (1971)]. These studies predicted that, as the gap size (d) between the surfaces decreased, the radiative heat flux first increases by several orders of magnitude until d is ∼ 100 nm after which the heat flux saturates. However, despite both the fundamental and practical importance of these predictions, the combined enhancement and saturation of NFRHT at small gaps in metallic surfaces remains experimentally unverified. Here, we probe NFRHT between planar metallic (Pt, Au) surfaces and show that RHT rates can exceed the far-field rate by over a thousand times when d is reduced to ∼ 25 nm. More importantly, we show that for small values of d RHT saturates due to the dominant contributions from transverse electric evanescent modes. Our results are in excellent agreement with the predictions of fluctuational electrodynamics and are expected to inform the development of technologies such as near-field thermophotovoltaics, radiative heat-assisted magnetic recording, and nanolithography
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Google Scholar:Rincón García, Laura
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Thompson, Dakotah
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Mittapally, Rohith
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Agrait de la Puente, Mario Nicolás
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Meyhofer, Edgar
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Reddy, Pramod
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