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24 June 2014 Three-dimensional plasmonic metamaterial absorbers for high-performance wavelength selective uncooled infrared sensors
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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.
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Shinpei Ogawa, Daisuke Fujisawa, Tomohiro Maegawa, Masashi Ueno, and Masafumi Kimata "Three-dimensional plasmonic metamaterial absorbers for high-performance wavelength selective uncooled infrared sensors", Proc. SPIE 9070, Infrared Technology and Applications XL, 90701Y (24 June 2014);

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