Near-field radiative heat transfer enhancement via surface phonon polaritons coupling in thin films

We investigate near-field thermal radiation between a nanometric film and a bulk SiC using fluctuational electrodynamics. Results show a narrow spectral band enhancement of the radiative flux for nanometric emitters due to coupling of surface phonon polaritons inside the film. For a 10 nm thick SiC...

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Bibliographic Details
Published in:Applied physics letters 2008-07, Vol.93 (4), p.043109-043109-3
Main Authors: Francoeur, Mathieu, Mengüç, M. Pinar, Vaillon, Rodolphe
Format: Article
Language:English
Subjects:
Engineering Sciences
Mechanics
Physics
Thermics
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Summary:We investigate near-field thermal radiation between a nanometric film and a bulk SiC using fluctuational electrodynamics. Results show a narrow spectral band enhancement of the radiative flux for nanometric emitters due to coupling of surface phonon polaritons inside the film. For a 10 nm thick SiC emitter, the total radiative flux is 2.2 times larger than for a bulk emitter. The total radiative flux is increased by a factor of 3.3 if a dielectric is coated with a 10 nm SiC film due to a splitting of the resonant frequency into two distinct ones, which has practical interests for near-field thermophotovoltaic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2963195