Production of low-voltage-driven liquid-crystal refractive-index grating

Abstract

The invention belongs to the photoelectron component technology field, it relates to the preparation method of the tuning grating in liquid crystal refractive index electric fields. First, mixing the photochromic high molecular material with azo base group and liquid crystal, and then pouring it into liquid crystal box; the liquid crystal box is composed of two pieces of glass base board whose inner surface is with transparency conductive film (ITO) , using isolation material to control the gap between two base board, and fixing with AB glue; using grating cover film board, irradiating with ultraviolet polarized light; the photochromic high molecular material doing isomerization reaction in bright streak area, inducing the fetch direction of the liquid crystal to be different in the bright ,dark streak area , forming the liquid crystal refractive index grating. The invention not only makes the preparation process of grating facilitated, it uses the photochromic high molecular material with high molecular weight to improve the long range stability of component while reduce the drive voltage of grating component, it can be preserved for eight months under the room temperature, the demands of external environment is not high. It has the advantages that the electric field is adjustable; driving voltage can match the integrated circuit.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, and relates to a method of dissolving photochromic polymers into nematic liquid crystals, and using a linear polarized light mask to illuminate the liquid crystals to produce periodic alignment and arrangement to form a low-voltage-driven tunable one-dimensional refractive index. The preparation method of the grating is specifically a preparation method of the liquid crystal refractive index grating driven by low voltage. technical background [0002] Gratings are important optical components and are widely used in many fields such as metrology, radio astronomy, integrated optics, optical communication and information processing. Although the technology of traditional gratings is very mature at present, the diffraction and reflection efficiency of gratings are not adjustable, and it is difficult to meet the requirements of modern display, communication, integrated optics, and optical storage...

AI Technical Summary

Problems solved by technology

[0003] In order to prepare a tunable grating, scientists have proposed a polymer / liquid crystal grating whose refractive index changes periodically. This kind of grating is still in the development stage. The main problem is that the driving voltage is too high, and it is difficult to integrate with TFT or large-scale The circuit is matched; the phase separation between the polymer and the liquid crystal is not complete, and the diffraction efficiency of the device is not high enough; in addition, the refractive index difference between the liquid crystal material and the polymer material is not large enough, and the adjustable range of the diffraction efficiency is small

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