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Proceedings Paper

An electrically tunable focusing and filtering infrared liquid-crystal device for light-field imaging and spectral imaging
Author(s): Mingce Chen; Zheng Li; Wenda He; Qi Shao; Jinxing Liu; Xinyu Zhang
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Paper Abstract

In this paper, we propose a novel dual-function infrared liquid-crystal device (DF-ILCD), which can simultaneously perform both tunable focusing and filtering functions through applying alternating current (AC) voltage signals. The key functional micro-structure of the DF-ILCD includes: two paralleled 1-mm-thick ZnSe substrates with 20-nm-thick aluminum (Al) films over their inner surfaces and a periodic repetition microholes over both substrates. The Al films act as both high-reflection films and conductive films. The conventional UV-photolithography and wet-etching process are used to fabricate an arrayed micro-hole with a diameter of 120μm and a period of 336μm over each substrate. The micro-cavity formed between ZnSe substrates has a typical depth of ~12 μm, which is fully filled by a nematic liquid-crystal (LC) materials. Experiments demonstrate that the proposed device exhibit both filtering function based on Fabry–Perot (FP) effect and electrically controlled tunable focusing function generated by the micro-hole electrodes, which is very promising for realizing both the light-field imaging and spectral imaging in the infrared wavelength range.

Paper Details

Date Published: 14 February 2020
PDF: 6 pages
Proc. SPIE 11428, MIPPR 2019: Multispectral Image Acquisition, Processing, and Analysis, 1142802 (14 February 2020); doi: 10.1117/12.2536316
Show Author Affiliations
Mingce Chen, Huazhong Univ. of Science and Technology (China)
Zheng Li, Huazhong Univ. of Science and Technology (China)
Wenda He, Huazhong Univ. of Science and Technology (China)
Qi Shao, Huazhong Univ. of Science and Technology (China)
Jinxing Liu, Huazhong Univ. of Science and Technology (China)
Xinyu Zhang, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 11428:
MIPPR 2019: Multispectral Image Acquisition, Processing, and Analysis
Xinyu Zhang; Chao Pan; Hongshi Sang, Editor(s)

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