Preparation of nematic liquid crystal film and recording method of high resolved transient grating thereof

A liquid crystal film, recording method technology, applied in the direction of optics, nonlinear optics, static indicators, etc.

Inactive Publication Date: 2008-11-05
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0003] However, the low molar mass nematic liquid crystal system also has great shortcomings. According to the reports of Rudenko and Khoo, it can be seen that due to the problem of ion recombination, the nematic liquid crystal system can only be used under a large grating pitch (generally in the tens of microns to tens of microns). In order to have an obvious photorefractive response, and the orientation response in the liquid crystal is the best when the grating spacing is approximately equal to twice the thickness of the liquid crystal film

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  • Preparation of nematic liquid crystal film and recording method of high resolved transient grating thereof

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Embodiment Construction

[0017] The following examples describe the present invention in more detail:

[0018] 1. Preparation of asymmetric liquid crystal cell with PVK photoconductive polymer film as alignment layer

[0019] The first step: Doping C with a mass percentage of 1 / 300 in the PVK white powder 60 , then the doped C 60 The PVK material is dissolved in the mixed solvent of toluene and pimelinketone, wherein the weight ratio of toluene and pimelinketone is 3: 1, and the weight ratio of solute and solvent is 8: 1;

[0020] Step 2: After leaving the solution for several hours, a small amount of C 60 and PVK dissolved in the solvent, the solution was light purple; in order to accelerate the dissolution of C 60 and PVK, manually stir the solution, and manually stir for more than 3 hours C 60 and PVK will be completely dissolved in the solvent to form a uniform, brown-red solution;

[0021] Step 3: Use an ultrasonic cleaner to clean the surface with a thickness of 1.1mm and an area of ​​2×2.5...

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Abstract

The present invention provides a preparation of a nematic liquid crystal device and a recording method of the high-resolution transient raster thereof. The nematic liquid crystal device is a nematic liquid crystal box which is prepared while uses the poly(N-vinylcarbazole) photoconduction polymer film as an oriented layer. The space-modulated optical radiation can form a high-resolution space charge field in the photoconduction polymer film. The field can traverse to the nematic liquid crystal film for driving the liquid crystal module for reorient and establish a high-resolution refraction ratio raster. The liquid crystal film can record the transient raster which has a peak value of efficiency of single order diffraction for -20% and a lifetime attenuating according to the e exponential relationship along with the increasing of the impressed voltage. The nematic liquid crystal device which can record the transient rater which has characteristics of adjustable lifetime and same intensity of peak value has latent application value in the fields of optical information procession, optical information transmission and the like.

Description

(1) Technical field [0001] The invention belongs to the technical field of high-resolution nematic liquid crystal storage devices and transient gratings in liquid crystal films. (2) Background technology [0002] Since the nematic liquid crystal molecules are easily reoriented under the action of an electric field, the photorefractive liquid crystal device can produce a strong refractive index grating under the action of an extremely weak electric field. Therefore, since 1994, liquid crystal photorefractive materials have caused widespread attention. What is even more exciting is the high sensitivity of this material, that is, the photorefractive grating in the liquid crystal can be obtained under the pump light intensity of tens of microwatts per square centimeter, which makes the nonlinear refractive index change coefficient of the liquid crystal can be reach the order of tens. [0003] But the nematic liquid crystal system of low molar mass also has great shortcomings. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G02F1/1337G02F1/133
Inventor 姚凤凤裴延波孙秀冬
Owner HARBIN INST OF TECH
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