Narrowband thermal radiation from closed-end microcavities

Asaka Kohiyama, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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.

Original languageEnglish
Article number133102
JournalJournal of Applied Physics
Issue number13
Publication statusPublished - 2015 Oct 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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