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Proceedings Paper

Three-dimensional plasmonic metamaterial absorbers for high-performance wavelength selective uncooled infrared sensors
Author(s): Shinpei Ogawa; Daisuke Fujisawa; Tomohiro Maegawa; Masashi Ueno; Masafumi Kimata
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Paper Abstract

A three-dimensional plasmonic metamaterial absorber (3-D PMA) was theoretically investigated and designed for the performance enhancement of wavelength selective uncooled infrared (IR) sensors. All components of the 3-D PMA are based on thin layers of plasmonic metals such as Au. The post produces a narrow gap, such as a few hundred nanometers, between the micropatch and the metal plate. The absorption properties of the 3-D PMA were investigated by rigorous coupled-wave analysis. A strong wavelength selective absorption is realized by the plasmonic resonant mode of the micropatch and the narrow-gap resonant mode between the micropatch and the plate. The disturbance of the post for both resonance modes is negligible. The absorption wavelength is defined mainly by the size of the micropatch, regardless of the micropatch array period and is longer than the micropatch array period. The absorption mode can also be controlled by the shape of the micropatch. Through-holes can be formed on the plate area, where there is no gap resonance to the micropatch. The thickness of each component can be reduced considering the skin depth effect and there is no added absorption of materials such as SiO2. A small pixel size with reduced thermal mass can be realized using a 3-D PMA structure. The results obtained here will contribute to the development of high-performance uncooled IR sensors for multicolor imaging.

Paper Details

Date Published: 24 June 2014
PDF: 8 pages
Proc. SPIE 9070, Infrared Technology and Applications XL, 90701Y (24 June 2014); doi: 10.1117/12.2049895
Show Author Affiliations
Shinpei Ogawa, Mitsubishi Electric Corp. (Japan)
Daisuke Fujisawa, Mitsubishi Electric Corp. (Japan)
Tomohiro Maegawa, Mitsubishi Electric Corp. (Japan)
Masashi Ueno, Mitsubishi Electric Corp. (Japan)
Masafumi Kimata, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 9070:
Infrared Technology and Applications XL
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton, Editor(s)

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