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Preparation method of color three-dimensional hologram based on holographic polymer dispersed liquid crystal grating

A technique of dispersing liquid crystals and three-dimensional holography, which is applied in the field of preparation of color three-dimensional holograms, and can solve problems such as preparation methods that have not been reported

Active Publication Date: 2011-12-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the emergence of nanophotonics has promoted the integration of laser holographic technology and polymer-dispersed liquid crystal materials. Applications in fields such as super prisms and high-performance sensors have attracted much attention (Chem. 36: 1868-1880; Chinese patent CN101793987A), but the preparation method of color three-dimensional hologram based on holographic polymer dispersed liquid crystal grating has not been reported

Method used

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  • Preparation method of color three-dimensional hologram based on holographic polymer dispersed liquid crystal grating
  • Preparation method of color three-dimensional hologram based on holographic polymer dispersed liquid crystal grating

Examples

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Effect test

Embodiment 1

[0034] In the 441.6nm laser interference field, first use holographic technology to make a holographic master that stores the reflected (or transmitted) light wave information (amplitude, phase) of the subject, and then use the object light to irradiate the holographic master in the direction of the Bragg angle. Diffraction light is generated, and the diffraction light and reference light are simultaneously irradiated by 0.01wt.% photosensitizer (1:1 3,3′-diethylthiacarbocyanine iodide and coumarin 6), 0.1wt.% co- Initiator (1:1:2 of N,N,N-triethylamine, N-methylmaleimide and 3-bromophenylglycine), 30wt.% of free radical polymerizable monomer ( 2:3:1 methyl methacrylate, methacrylamide and N-vinylpyrrolidone) and 70wt.% liquid crystal (2:1 8CB and 5CT) to prepare a holographic backplane with a thickness of 10 μm, when it reaches When the total optical path of the two laser beams of the holographic plate is equal, the two lasers will be optically coherent on the holographic pla...

Embodiment 2

[0036] In the 441.6nm laser interference field, first use holographic technology to make a holographic master that stores the reflected (or transmitted) light wave information (amplitude, phase) of the subject, and then use the object light to irradiate the holographic master in the direction of the Bragg angle. Diffraction light is generated, and the diffraction light and reference light are simultaneously irradiated by 0.01wt.% photosensitizer (coumarin 343 and 7-diethylamino-3-thienoylcoumarin of 1:2), 0.1wt.% The co-initiator (1:2:1 N-ethylmaleimide, N-phenylglycine and 2,4,6-tris(trichloromethyl)-1,3,5-triazine) , 90wt.% free radical polymerizable monomers (1:2:1 butyl acrylate, 2-isooctyl acrylate and N-isopropylacrylamide) and 10wt.% liquid crystal E7 made the thickness For a holographic base plate of 15 μm, when the total optical path of the two laser beams reaching the holographic base plate is equal, the two laser beams will be optically coherent on the holographic b...

Embodiment 3

[0038]In the 441.6nm laser interference field, first use holographic technology to make a holographic master that stores the reflected (or transmitted) light wave information (amplitude, phase) of the subject, and then use the object light to irradiate the holographic master in the direction of the Bragg angle. Generate diffracted light, and the diffracted light and reference light are simultaneously irradiated by 0.01wt.% photosensitizer (1:1 3,3'-carbonyl bis(7-diethylaminocoumarin) and 6-hydroxyl-7-formazan Oxygen-4-phenylcoumarin), 10wt.% co-initiator (2:1:1 triethanolamine, acetylphenylglycine and 3-cyanophenylglycine), 70wt.% free Based polymerized monomer (1:1:2 ethyl dimethacrylate, trimethylolpropane trimethacrylic acid and N-vinyl carbazole) and 20wt.% liquid crystal P0616A prepared a thickness of 15μm Holographic base plate, when the total optical path of the two laser beams reaching the holographic base plate is equal, the two laser beams will be optically coherent...

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Abstract

The invention provides a method for preparing a colour three-dimensional hologram based on holographic polymer dispersed liquid crystal grating. The method comprises the following steps of: firstly preparing a holographic motherboard stored with reflection (or transmission) light wave information (amplitude and phase) of a photographed object by using a holographic photographic technology in a laser interference field with the wavelength of 441.6 nm; then, irradiating the holographic motherboard by using object light in a Bragg angle direction to generate diffraction light, wherein the holographic motherboard prepared from photo-sensitizer, co-initiator, a monomer capable of performing free radical polymerization and liquid crystal is simultaneously irradiated by the diffraction light and reference light, when total optical distances of the two beams reaching the holographic motherboard are equal, the two beams generate optical coherence on the holographic motherboard; and then, preparing the colour three-dimensional hologram based on the holographic polymer dispersed liquid crystal grating so that an image of the photographed object can be observed in the sun.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a method for preparing a color three-dimensional hologram based on a holographic polymer dispersed liquid crystal grating. Background technique [0002] Compared with traditional molded imaging, color three-dimensional holographic storage and readout has stronger visual effects, and has broad application prospects in the fields of display and anti-counterfeiting. Due to the characteristics of light weight, durability, and good flexibility, polymers have been applied in the field of image storage. The holographic photopolymer material developed by DuPont has very high diffraction efficiency (US Patent US5098803-A). However, due to the lack of sufficient refractive index modulation amplitude, most polymers have low diffraction efficiency and low brightness of the corresponding holograms, so they lack practical applications. Polymer dispersed liquid crystal is an effective means to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/14
CPCG03H2260/33G03H2260/12G03H1/20G03H1/24G03H1/0248G03H2001/2271
Inventor 解孝林彭海炎周兴平郑成赋葛宏伟
Owner HUAZHONG UNIV OF SCI & TECH
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