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8 July 2019 Design of linear polarizer in 3-13μm broad infrared region with multilayer nanostructures
Jie Xia, Zhihao Yuan II, Chinhua Wang
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Proceedings Volume 11064, Tenth International Conference on Thin Film Physics and Applications (TFPA 2019); 110640N (2019) https://doi.org/10.1117/12.2539565
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China
Abstract
The design of a ZnSe-based linear polarizer operating in 3-13 μm broad infrared region with multilayer nanograting structures is performed. The multilayer nanograting structure is formed by a dielectric nanograting that is etched into ZnSe substrate, followed by metal/dielectric/metal thin film structure that are evaporated successively on the top and bottom of the ZnSe dielectric nanograting. An optical cavity is formed on both top and bottom of the ZnSe dielectric nanograting. Polarization characteristics of the proposed polarizer on structural parameters are investigated and an optimized multilayer structure is obtained. An extinction ratio (ER) of higher than 74 dB and TM-transmission (TMT) of averagely higher than 84% in the whole 3-13 μm broad waveband are obtained with a 250-nm-period multilayer nanograting. The ZnSe-based multilayer structure shows the possibility of achieving wide-band and high-performance polarization in 3-13 μm infrared region in a fashion of relatively easy-fabrication, in which no ion etching process is needed for the formation of metallic nanogratings.
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Jie Xia, Zhihao Yuan II, and Chinhua Wang "Design of linear polarizer in 3-13μm broad infrared region with multilayer nanostructures", Proc. SPIE 11064, Tenth International Conference on Thin Film Physics and Applications (TFPA 2019), 110640N (8 July 2019); https://doi.org/10.1117/12.2539565
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KEYWORDS
Linear polarizers
Infrared radiation
Nanostructures
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