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Temperature-dependent and optimized thermal emission by spheres

Authors :
O. Merchiers
K.L. Nguyen
Pierre-Olivier Chapuis
Centre d'Energétique et de Thermique de Lyon (CETHIL)
Université Claude Bernard Lyon 1 (UCBL)
Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon)
Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Source :
Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2018, 112 (11), ⟨10.1063/1.5010426⟩
Publication Year :
2018
Publisher :
HAL CCSD, 2018.

Abstract

We investigate the temperature and size dependencies of thermal emission by homogeneous spheres as a function of their dielectric properties. Different power laws obtained in this work show that the emitted power can depart strongly from the usual fourth power of temperature given by Planck's law and from the square or the cube of the radius. We also show how to optimize the thermal emission by selecting permittivities leading to resonances, which allow for the so-called super-Planckian regime. These results will be useful as spheres, i.e. the simplest finite objects, are often considered as building blocks of more complex objects.

Details

Language :
English
ISSN :
00036951
Database :
OpenAIRE
Journal :
Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2018, 112 (11), ⟨10.1063/1.5010426⟩
Accession number :
edsair.doi.dedup.....509343c958f0d7c0815b4af950fce4ba
Full Text :
https://doi.org/10.1063/1.5010426⟩