Narrowband thermal radiation from closed-end microcavities

High spectral selectivity of thermal radiation is important for achieving high-efficiency energy systems. In this study, intense, narrowband, and low directional absorption/radiation were observed in closed-end microcavity which is a conventional open-end microcavity covered by a semi-transparent th...

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Bibliographic Details
Published in:Journal of applied physics 2015-10, Vol.118 (13)
Main Authors: Kohiyama, Asaka, Shimizu, Makoto, Iguchi, Fumitada, Yugami, Hiroo
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTION SPECTRA
APERTURES
Applied physics
ASYMMETRY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
COMPUTERIZED SIMULATION
ELECTRIC CONDUCTIVITY
Electrical resistivity
Mathematical models
METALS
Microcavities
Narrowband
Q factors
QUALITY FACTOR
SILICA
Silicon dioxide
SILICON OXIDES
THERMAL RADIATION
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Summary:High spectral selectivity of thermal radiation is important for achieving high-efficiency energy systems. In this study, intense, narrowband, and low directional absorption/radiation were observed in closed-end microcavity which is a conventional open-end microcavity covered by a semi-transparent thin metal film. The quality factor (Q factor) of optical absorption band strongly depended on the film electrical conductivity. Asymmetric and narrow absorption band with a Q factor of 25 at 1.28 μm was obtained for a 6-nm-thick Au film. Numerical simulations suggest that the formation of a fixed-end mode at the cavity aperture contributes to the narrowband optical absorption. The closed-end microcavity filled with SiO2 exhibits intense and isotropic thermal radiation over a wide solid angle according to numerical simulation. The narrow and asymmetric absorption spectrum was experimentally confirmed in a model of closed-end microcavity.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4931375