A high-transmission liquid-crystal Fabry-Perot infrared filter for electrically tunable spectral imaging detection

Zhonglun Liu; Zhaowei Xin; Huabao Long; Dong Wei; Wanwan Dai; Xinyu Zhang; Haiwei Wang; Changsheng Xie

doi:10.1117/12.2286463

19 February 2018 A high-transmission liquid-crystal Fabry-Perot infrared filter for electrically tunable spectral imaging detection

Zhonglun Liu, Zhaowei Xin, Huabao Long, Dong Wei, Wanwan Dai, Xinyu Zhang, Haiwei Wang, Changsheng Xie

Author Affiliations +

Proceedings Volume 10607, MIPPR 2017: Multispectral Image Acquisition, Processing, and Analysis; 106070C (2018) https://doi.org/10.1117/12.2286463
Event: Tenth International Symposium on Multispectral Image Processing and Pattern Recognition (MIPPR2017), 2017, Xiangyang, China

Abstract

Previous studies have presented the usefulness of typical liquid-crystal Fabry-Perot (LC-FP) infrared filters for spectral imaging detection. Yet, their infrared transmission performances still remain to improve or even rise. In this paper, we propose a new type of electrically tunable LC-FP infrared filter to solve the problem above. The key component of the device is a FP resonant cavity composed of two parallel plane mirrors, in which the zinc selenide (ZnSe) materials with a very high transmittance in the mid-long-wavelength infrared regions are used as the electrode substrates and a layer of nano-aluminum (Al) film, which is directly contacted with liquid-crystal materials, is chosen to make high reflective mirrors as well as the electrodes. Particularly, it should be noted that the directional layer made up of ployimide (PI) used previously is removed. The experiment results indicate that the filter can reduce the absorption of infrared wave remarkably, and thus highlight a road to effectively improve the infrared transmittance ability.

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Zhonglun Liu, Zhaowei Xin, Huabao Long, Dong Wei, Wanwan Dai, Xinyu Zhang, Haiwei Wang, and Changsheng Xie "A high-transmission liquid-crystal Fabry-Perot infrared filter for electrically tunable spectral imaging detection", Proc. SPIE 10607, MIPPR 2017: Multispectral Image Acquisition, Processing, and Analysis, 106070C (19 February 2018); https://doi.org/10.1117/12.2286463

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