Upper limits to near-field radiative heat transfer: generalizing the blackbody concept

Owen D. Miller; Alejandro W. Rodriguez; Steven G. Johnson

doi:10.1117/12.2240718

16 September 2016 Upper limits to near-field radiative heat transfer: generalizing the blackbody concept

Owen D. Miller, Alejandro W. Rodriguez, Steven G. Johnson

Proceedings Volume 9920, Active Photonic Materials VIII; 99200B (2016) https://doi.org/10.1117/12.2240718
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

For 75 years it has been known that radiative heat transfer can exceed far-field blackbody rates when two bodies are separated by less than a thermal wavelength. Yet an open question has remained: what is the maximum achievable radiative transfer rate? Here we describe basic energy-conservation principles that answer this question, yielding upper bounds that depend on the temperatures, material susceptibilities, and separation distance, but which encompass all geometries. The simple structures studied to date fall far short of the bounds, offering the possibility for significant future enhancement, with ramifications for experimental studies as well as thermophotovoltaic applications.

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Citation Download Citation

Owen D. Miller, Alejandro W. Rodriguez, and Steven G. Johnson "Upper limits to near-field radiative heat transfer: generalizing the blackbody concept", Proc. SPIE 9920, Active Photonic Materials VIII, 99200B (16 September 2016); https://doi.org/10.1117/12.2240718

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