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A kind of preparation method of liquid crystal polarization grating

A liquid crystal polarization grating and liquid crystal cell technology, applied in polarizing elements, diffraction gratings, optics, etc., can solve problems such as complex optical paths, poor flexibility, and difficulty in mass production, and achieve strong anti-interference ability, large adjustment range, and simple structure Effect

Active Publication Date: 2021-08-17
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a liquid crystal polarization grating, which solves practical problems such as complex optical paths, high cost, poor flexibility, and difficulty in mass production in the preparation of current liquid crystal polarization gratings.

Method used

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  • A kind of preparation method of liquid crystal polarization grating
  • A kind of preparation method of liquid crystal polarization grating
  • A kind of preparation method of liquid crystal polarization grating

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Embodiment Construction

[0035] 1. Preparation of wedge-shaped liquid crystal cell

[0036] 1) figure 2 It is a structural schematic diagram of a wedge-shaped liquid crystal cell, which includes a glass substrate, a gap spacer, a conductive layer, an alignment layer, a liquid crystal layer, and a voltage control unit.

[0037] 2) First, use acetone, ethanol and ultrapure water to clean the substrate. After drying, evaporate an ITO conductive film on one side of the substrate with a thickness of about 20 nm. Spin-coat a rubbing alignment agent on the conductive film side of the glass substrate, 230 Cure at high temperature, and then perform rubbing orientation under a rubbing machine, make a frame glue on a part of the glass substrate, place spacers with 3 μm and 100 μm gaps on both sides, and place the other part of the glass substrate antiparallel on the substrate. Pressed into a box, filled with liquid crystal and then sealed;

[0038] 2. Preparation of light-controlled orientation glass substrat...

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Abstract

The invention discloses a preparation method of a liquid crystal polarization grating, which belongs to the technical field of non-mechanical beam deflection in an active photoelectric system, and mainly aims at the problems that the optical path of the current liquid crystal polarization grating preparation is relatively complicated, susceptible to external interference, and poor in flexibility. In the invention, a wedge-shaped liquid crystal cell is used to split the incident laser light, and a wave plate is used to change the polarization state of the light beam. After the interference of the two beams of light, a pattern in which the polarization direction varies linearly with the position is formed in a certain area, and finally the photosensitive coating is irradiated to induce the liquid crystal molecules Orientation is carried out to prepare and form a liquid crystal polarization grating. The present invention changes the angle between the two beams of light after beam splitting by controlling the voltage applied to both sides of the wedge box, and can simultaneously realize the preparation of liquid crystal polarization gratings with different period sizes. The preparation method of the liquid crystal polarization grating disclosed by the invention is simple, reliable, low in cost, convenient and flexible, and is an ideal preparation scheme for the engineering application of the liquid crystal polarization grating.

Description

technical field [0001] The invention belongs to the technical field of non-mechanical light beam deflection in active photoelectric systems, and specifically refers to a method for preparing a liquid crystal polarization grating. Background technique [0002] Liquid crystal polarization grating is a new type of high-efficiency functional liquid crystal device. Its essence is to modulate the phase and polarization state of incident light by adjusting the spatial distribution of the liquid crystal optical axis. To a certain extent, it breaks through the performance limit of the original optical components. The most important feature of the liquid crystal polarization grating structure is that the photo-crosslinking reaction of the photosensitive material promotes the regular orientation of the liquid crystal molecules, and the optical axis of the liquid crystal molecules changes linearly in one-dimensional direction continuously and rotates 180° in one cycle. It is precisely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18G02B5/30G02F1/1335G02F1/13363G02F1/1337
CPCG02B5/1833G02B5/3016G02F1/133528G02F1/13363G02F1/133784G02F1/133788G02F1/133638
Inventor 穆全全王启东彭增辉刘永刚姚丽双宣丽
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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