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Liquid crystal polarization converter, preparation method and vector photoalignment system

A polarization converter and light-controlled orientation technology, which is applied in the field of vector beams, can solve the problems of only being applicable, the design and preparation methods of polarization converters are limited to vector beams, etc., and achieve the effect of simple structure.

Active Publication Date: 2015-11-11
南京晶萃光学科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

These two methods of generating vector beams have the following problems: on the one hand, only simple patterns of vector beams can be generated; on the other hand, they are only suitable for single wavelengths
[0004] In addition, in the prior art, there is also a polarization converter based on twisted nematic liquid crystal (TNLC), but the design and fabrication methods of this type of polarization converter are still limited to the generation of vector beams with simple modes

Method used

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  • Liquid crystal polarization converter, preparation method and vector photoalignment system
  • Liquid crystal polarization converter, preparation method and vector photoalignment system
  • Liquid crystal polarization converter, preparation method and vector photoalignment system

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Embodiment 1

[0053] An embodiment of the present invention provides a liquid crystal polarization converter, figure 1 A schematic cross-sectional structure diagram of a liquid crystal polarization converter provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the liquid crystal polarization converter includes: a first substrate 11 and a second substrate 12 oppositely arranged, and a liquid crystal layer 13 located between the first substrate 11 and the second substrate 12; wherein, the first Spacer particles 14 are arranged between the substrate 11 and the second substrate 12 to support the liquid crystal layer 13; the sides of the first substrate 11 and the second substrate 12 adjacent to the liquid crystal layer 13 are respectively provided with photo-control alignment films 15a and a photoalignment film 15b, the molecular director direction of the photoalignment film 15a of the first substrate 11 is uniformly arranged, and the molecular director direction of...

Embodiment 2

[0073] The embodiment of the present invention also provides a preparation method of a liquid crystal polarization converter, Figure 8 It is a schematic flowchart of a method for preparing a liquid crystal polarization converter provided in Embodiment 2 of the present invention.

[0074] Such as Figure 8 As shown, the method includes the following operations:

[0075] S110, forming a photo-alignment film on a side of the first substrate and the second substrate adjacent to the liquid crystal layer.

[0076] Optionally, before forming the photo-controlled alignment film, in order to increase the wettability and adhesion between the photo-controlled alignment film and the first substrate and the second substrate, ultrasonic cleaning was carried out for 30 minutes with a washing solution (mixed reagents such as acetone and alcohol) , and then ultrasonically cleaned twice with ultrapure water for 10 minutes each. After drying in an oven at 120° C. for 40 minutes, UVO (ultravi...

Embodiment 3

[0096] On the basis of the above-mentioned embodiments, an embodiment of the present invention also provides a method for performing multi-step overlapping exposure on the photoalignment film of the second substrate. Specifically, the method includes: using a maskless dynamic projection exposure system , according to the exposure sequence, select the corresponding exposure pattern and the corresponding induced light polarization direction, and perform exposure sequentially; wherein, the exposure areas of the exposure patterns in adjacent steps overlap, and the induced light polarization direction monotonically increases or decreases monotonically with the exposure sequence small, to form at least one molecular director direction gradually distributed and center-symmetrical orientation control graphics.

[0097] Figure 9a-9d It is a schematic diagram of a method for performing multi-step overlapping exposure on the photoalignment film of the second substrate provided by Embodi...

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Abstract

The invention discloses a liquid crystal polarization converter, a preparation method and a vector photoalignment system. The liquid crystal polarization converter comprises a first substrate and a second substrate which are oppositely arranged, a liquid crystal layer located between the first substrate and the second substrate, and spacing particles for supporting the liquid crystal layer. The sides, close to the liquid crystal layer, of the first substrate and the second substrate are provided with photoalignment films, molecular directors of the photoalignment film of the first substrate are uniformly arranged, and molecular directors of at least one set region in the photoalignment film of the second substrate are distributed in a gradually-changed mode and are in central symmetry so that linearly-polarized incident light irradiated on the liquid crystal polarization converter can be converted into vector light beams. The liquid crystal polarization converter can generate vector light beams of multiple modes, and is simple in structure and suitable for broad bands.

Description

technical field [0001] The invention relates to the technical field of vector light beams, in particular to a liquid crystal polarization converter, a preparation method and an optical control alignment system. Background technique [0002] In recent years, due to the application of vector beams in super-resolution microscopy, focal field engineering, optical manipulation, excitation of surface plasmons, and laser processing, the research on vector beams has attracted more and more attention. Compared with ordinary polarized light, the vector beam's polarization direction changes with different spatial positions, and the distribution is center-symmetric. This highly symmetrical polarization distribution makes vector beams have a series of special properties and applications. [0003] In the prior art, there are many methods for generating vector beams, which can be mainly divided into active type and passive type. Among them, the active generation of vector beams is realiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337G02F1/1335G02F1/01
CPCG02F1/0136G02F1/133528G02F1/133788
Inventor 胡伟陈鹏季玮魏冰妍陆延青徐飞
Owner 南京晶萃光学科技有限公司