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Research on Infrared Detection Technology Based on the Liquid Crystal Optical Rotatory Effect

Author: HanXiong
Tutor: CaiChangLong
School: Xi'an University of Technology
Course: Optical Engineering
Keywords: cholesteric liquid crystal optical rotatory collodion film polyimide opticalproperties
CLC: O753.2
Type: Master's thesis
Year: 2013
Downloads: 34
Quote: 0
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Abstract


Most reported infrared detectors are electrical readout, while optical readout infrared detectors are less. Compared with electrical readout infrared detectors, optical readout infrared detectors have many advantages, such as small dimension, low cost, without refrigeration equipment, without high-precision and high-gain readout circuit. Optical readout has been a new direction in the development of infrared technology. However, the infrared detection sensitive material has always plagued the development of optical readout infrared detectors. Therefore, finding good performance infrared material will contribute to solving the problem.This paper studies sample preparation of cholesteric liquid crystals(CLCs)、the infrared absorption film deposition process and liquid crystal alignment technology based on optical rotatory and thermo-optic effect of CLCs. Firstly, by means of chiral agent S1011, nematic phase liquid crystals are induced to different CLCs sample, testing each sample’s corresponding rotation angle and the results show that when precursor liquid crystals was SLC7014-100and chiral agent content was1%, the sample’s rotation angle was maximum, about87°. However, further study found that the cholesteric liquid crystal sample absorption of infrared radiation was bad. It is need to deposit infrared absorption film on the liquid crystals cell substrate in order to improve the infrared absorptivity. As for infrared absorbing film, the paper focus on collodion film deposition process and film’s optical properties. The collodion film was prepared by spin coating. The visible average transmittance is more than90%, infrared average absorptivity in3-5μm is about65%, infrared peak wavelength absorptivity in8-14μm is up to93%. In this article, preparation of polyimide alignment film and rubbing alignment were studied. Finally the PI film with average visible transmittance more than80%, thickness of70nm and pretilt angle of3°has been obtained.Based on CLCs’thermo-optic effect and optical rotatory, this paper studies a novel optical readout infrared detection technology, which provides us with a new idea in researching the uncooled optical readout infrared detection imaging technology.

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CLC: > Mathematical sciences and chemical > Crystallography > Amorphous and class crystalline > Class crystalline > Liquid crystal
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