Chinese Optics Letters, 2013, 11 (s1): S10401, Published Online: May. 30, 2013  

Design and preparation of LWIR narrow-band filter with wide rejection band Download: 909次

Author Affiliations
Science and Technology on Surface Engineering Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, China
Abstract
In this letter, using mult-half-wave structure and some chosen films optimized method, the long-wave infrared (LWIR) narrow-band pass filter is investigated, meanwhile the opposite of the substrate coated with long-wavelength pass film. The transmittance of design spectrum is more than 80% at wavelength region of 8.05–8.35 \mu m, and the average transmittance is less than 0.5% at wavelength region of less than 7.95 and 8.45–14 \mu m. The filter is prepared by thermal evaporation method, and plasma-assisted deposition technology. The experiment result shows that the average transmittance is about 75% in the transmission wavelength range, and the average transmittance of cut-off band is about 0.3%. The results show that multi-half-wave structure and some chosen films optimized method for the preparation LWIR narrow-band pass filter are feasible. The film system is simplified and is convenient to prepare the film.

董茂进, 陈焘, 熊玉卿, 王多书, 张玲. Design and preparation of LWIR narrow-band filter with wide rejection band[J]. Chinese Optics Letters, 2013, 11(s1): S10401.

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