Here, closed-end microcavity is proposed in which a semi-transparent metal film was formed atop microcavity. The structure shows weak angular dependence as well as quasi-monochromatic absorptance. Au is employed as material of the cavity walls and the covering thin film. Quasi-monochromatic absorption from the structure is observed in numerical simulation. High quality factor (Q factor) is obtained by strong confinement in the closed-end microcavity. Asymmetric and quasi-monochromatic absorption band with a Q factor of ∼28 at 1.85 μm was observed. This value was about 4-fold larger than that of the open-end microcavity. Additionally, the closed-end microcavity structure filled with SiO2 in cavity exhibits isotropic and quasi-monochromatic thermal radiation over a wide solid angle. This result suggests that both quasi-monochromatic and low-directivity absorptance can be realized by using this configuration.
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ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer
January 4–6, 2016
Biopolis, Singapore
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4965-1
PROCEEDINGS PAPER
Low-Directivity Quasi-Monochromatic Thermal Radiation From Microcavities Covered by Thin Metal Film
Asaka Kohiyama,
Asaka Kohiyama
Tohoku University, Sendai, Japan
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Makoto Shimizu,
Makoto Shimizu
Tohoku University, Sendai, Japan
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Fumitada Iguchi,
Fumitada Iguchi
Tohoku University, Sendai, Japan
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Hiroo Yugami
Hiroo Yugami
Tohoku University, Sendai, Japan
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Asaka Kohiyama
Tohoku University, Sendai, Japan
Makoto Shimizu
Tohoku University, Sendai, Japan
Fumitada Iguchi
Tohoku University, Sendai, Japan
Hiroo Yugami
Tohoku University, Sendai, Japan
Paper No:
MNHMT2016-6683, V001T05A013; 5 pages
Published Online:
March 15, 2016
Citation
Kohiyama, A, Shimizu, M, Iguchi, F, & Yugami, H. "Low-Directivity Quasi-Monochromatic Thermal Radiation From Microcavities Covered by Thin Metal Film." Proceedings of the ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. Volume 1: Micro/Nanofluidics and Lab-on-a-Chip; Nanofluids; Micro/Nanoscale Interfacial Transport Phenomena; Micro/Nanoscale Boiling and Condensation Heat Transfer; Micro/Nanoscale Thermal Radiation; Micro/Nanoscale Energy Devices and Systems. Biopolis, Singapore. January 4–6, 2016. V001T05A013. ASME. https://doi.org/10.1115/MNHMT2016-6683
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