CN101793987A - Preparation material of high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating and preparation method thereof - Google Patents
Preparation material of high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating and preparation method thereof Download PDFInfo
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- CN101793987A CN101793987A CN200910045717A CN200910045717A CN101793987A CN 101793987 A CN101793987 A CN 101793987A CN 200910045717 A CN200910045717 A CN 200910045717A CN 200910045717 A CN200910045717 A CN 200910045717A CN 101793987 A CN101793987 A CN 101793987A
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Abstract
The invention relates to a preparation material of a high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating and a preparation method thereof. The preparation material is prepared by the following steps of: forming a mixed emulsion by an acrylate monomer with polyfunctional groups, a crosslinking agent, an initiator, a co-initiator and nematic liquid crystal; wafering the mixed emulsion into a liquid crystal box made of two transparent conductive panes; arranging the liquid crystal box in an interference light field of green laser for holographic exposure; accurately controlling exposure intensity and time; and then, enabling the liquid crystal box to stand still in a dark room for a certain time. The prepared high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating has the diffraction efficiency over 95 percent and the scattering and high-order diffraction loss lower than 1 percent.
Description
Technical field
The invention belongs to the electric light field of functional materials, relate to a kind of high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating and prepare material and preparation method thereof.
Background technology
Known Bragg body grating has very high diffraction efficiency, the incident ray that satisfies Bragg condition diffraction efficiency in theory can reach 100%. diffraction efficiencies and incident wavelength, incident angle, the body material index modulation degree of depth (Δ n), and the relating to parameters such as thickness of body grating. have very little angle stragging degree. so the Bragg body grating is a kind of high-resolution dispersion element, can be used for spectral analysis, laser shaping, photoswitch reaches many fields such as photomodulator.
Prior art discloses holographic polymer dispersed liquid crystal as an electric light functional material, since its can be automatically controlled optical property, being applied to already preparing in the research of Bragg body grating. but general effect is good inadequately always. show that mainly diffraction efficiency is not high, big etc. less than 85%. scattering losses, and the driving voltage height, surpass 18V/ μ m.
The main cause one that the problems referred to above exist is the matching degree of the optical parametric of material, the 2nd, and it is good inadequately among the common holographic preparation method grating to be formed technological parameter control, thereby as exposure intensity and time shutter. form bigger liquid crystal droplet easily.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, provide a kind of high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating to prepare material and preparation method thereof.
The present invention is reflected at exciting light according to photopolymerization and stops the characteristics that the successor so can proceed, it is so-called back assembly effect (post-curing effect), this back assembly effect is carried out, make the reaction product of polymkeric substance have fine and close more micromechanism. for this reason, the present invention proposes a kind of preparation material for preparing the high-level efficiency holographic polymer dispersed liquid crystal Bragg volume grating and preparation method thereof according to the real-time measurement result of diffraction efficiency of grating in the holographic exposure process.
Described preparation material is by multi-functional acrylate monomer, glue crosslinking agent, initiating agent, association's initiating agent, and nematic liquid crystal is formed mixed emulsion. and its envelope is annotated in liquid crystal cell, placed in the interference optical field of green laser and carry out holographic exposure.Accurately control exposure intensity and time, make liquid crystal cell in the darkroom, leave standstill certain hour then. realize utilizing the back assembly effect of polyreaction to make as yet not the monomer of polymerization fully further finish the purpose of reaction.The diffraction efficiency of prepared holographic polymer dispersed liquid crystal Bragg volume grating can surpass 95%, and scattering and high order diffraction loss are lower than 1%.
The present invention prepares in the material, and described multi-functional acrylate monomer (TMPTA) adopts the acrylate monomer trimethylolpropane triacrylate (TMPTA) of trifunctional. and its component content is 35%-50%, preferred 35.4%.
The present invention prepares in the material, and it is 10%-15% that described glue crosslinking agent adopts its component content of N-vinylpyrrollidone (NVP), and preferred 13%.
The present invention prepares in the material, and described initiating agent adopts Rose Bengal (RB), and its component content is 0.4%-0.6%, and preferred 0.6%.
The present invention prepares in the material, and described association initiating agent adopts N-phenylglycine (NPG), and its component content is 0.5%-1%, and preferred 1%.
The present invention prepares in the material, and described nematic liquid crystal adopts RO-TN-570, or E7 reaches and the similarly mixed liquid crystal of E7, and its component content is 40%-60%, and preferred 50%.
The present invention prepares in the material, and described liquid crystal cell is by two electro-conductive glass, and liner and resin fluid sealant constitute. and box is thick to be 10-30 μ m, preferred 25 μ m.
Among the present invention, used green glow is the continuous laser of 532nm wavelength in the holographic system exposure process, and the intensity of every Shu Jiguang is 5 milliwatts, and the time shutter is 8 seconds. and the time shutter is by computer control. and liquid crystal cell left standstill in the darkroom 10 minutes
For the ease of understanding, below will describe in detail the present invention by specific embodiment.It needs to be noted that these descriptions only are exemplary descriptions, do not constitute limitation of the scope of the invention.According to the argumentation of this instructions, many variations of the present invention, change all are conspicuous concerning one of ordinary skill in the art.
Embodiment
Embodiment 1
Adopt its component content to be respectively 35% acrylate monomer, 10% glue crosslinking agent, 0.4% initiating agent, association's initiating agent of 0.5%, and 40% nematic liquid crystal is formed mixed emulsion. annotating its envelope thick in box is in the liquid crystal cell of 10 μ m, placing in the interference optical field of green laser and carry out holographic exposure. the used green glow of exposure process is the continuous laser of 532nm wavelength, the intensity of every Shu Jiguang is 5 milliwatts, time shutter is 8 seconds. liquid crystal cell left standstill in the darkroom 10 minutes, realize as yet that not the monomer of polymerization fully further finishes the purpose of reaction. the holographic polymer dispersed liquid crystal that makes (HPDLC) Bragg body grating, area of raster is 5 * 5mm
2. grating cycles 1.1 μ m. to the He-Ne light (wavelength 632.8nm) of incident have 15.3 ° the time maximum diffraction efficiency can surpass 95%. and scattering and the high order diffraction loss differential seat angle that is lower than 1%. diffraction maximums and the first zero be 2 °.
Embodiment 2
Adopt its component content to be respectively 50% acrylate monomer, 15% glue crosslinking agent, 0.6% initiating agent, association's initiating agent of 1%, and 60% nematic liquid crystal is formed mixed emulsion. annotating its envelope thick in box is in the liquid crystal cell of 30 μ m, placing in the interference optical field of green laser and carry out holographic exposure. the used green glow of exposure process is the continuous laser of 532nm wavelength, the intensity of every Shu Jiguang is 5 milliwatts, time shutter is 8 seconds. liquid crystal cell left standstill in the darkroom 10 minutes, realize as yet that not the monomer of polymerization fully further finishes the purpose of reaction. the holographic polymer dispersed liquid crystal that makes (HPDLC) Bragg body grating, area of raster is 5 * 5mm
2. grating cycles 1.1 μ m. to the He-Ne light (wavelength 632.8nm) of incident have 15.3 ° the time maximum diffraction efficiency can surpass 95%. and scattering and the high order diffraction loss differential seat angle that is lower than 1%. diffraction maximums and the first zero be 2 °.
Embodiment 3
Adopt its component content to be respectively acrylate monomer 35.4%, glue crosslinking agent 13%, initiating agent 0.6%, association's initiating agent 1%, nematic liquid crystal 50%, form mixed emulsion. its envelope is annotated in the liquid crystal cell of the thick 25 μ m of box, placing in the interference optical field of green laser and carry out holographic exposure. the used green glow of exposure process is the continuous laser of 532nm wavelength, the intensity of every Shu Jiguang is 5 milliwatts, time shutter is 8 seconds. liquid crystal cell leaves standstill in the darkroom and made as yet not fully the monomer of polymerization further finish reaction in 10 minutes, prepared holographic polymer dispersed liquid crystal (HPDLC) Bragg body grating, area of raster is 5 * 5mm
2. grating cycles 1.1 μ m. to the He-Ne light (wavelength 632.8nm) of incident have 15.3 ° the time maximum diffraction efficiency can surpass 95%. and scattering and the high order diffraction loss differential seat angle that is lower than 1%. diffraction maximums and the first zero be 2 °.
Claims (10)
1. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating prepares material, it is characterized in that by following method preparation:
Adopt multi-functional acrylate monomer, glue crosslinking agent, initiating agent, after association's initiating agent and nematic liquid crystal were formed mixed emulsion, envelope was annotated in liquid crystal cell, place in the interference optical field of green laser and carry out holographic exposure, accurately control exposure intensity and time, make liquid crystal cell in the darkroom, leave standstill certain hour then, make as yet not fully the monomer of polymerization further finish reaction and make.
2. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described multi-functional acrylate monomer adopts the acrylate monomer trimethylolpropane triacrylate of trifunctional, and its component content is 35%-50%.
3. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described glue crosslinking agent adopts N-vinylpyrrollidone, and its component content is 10%-15%.
4. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described initiating agent adopts Rose Bengal, and its component content is 0.4%-0.6%.
5. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described association initiating agent adopts N-phenylglycine, and its component content is 0.5%-1%.
6. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described nematic liquid crystal is selected from RO-TN-570, or E7 or with the similarly mixed liquid crystal of E7, its component content is 40%-60%.
7. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that, described liquid crystal cell is by two electro-conductive glass, and liner and resin fluid sealant constitute.
8. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 7 prepares material, it is characterized in that, described liquid crystal cell is thick to be 10-30 μ m.
9. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that in the described material acrylate monomer, glue crosslinking agent, initiating agent, association's initiating agent, the content of nematic liquid crystal is respectively 35.4%, 13%, 0.6%, 1%, 50%.
10. high-efficiency holographic polymer dispersed liquid crystal Bragg volume grating according to claim 1 prepares material, it is characterized in that used green glow is the continuous laser of 532nm wavelength in the described holographic system exposure process, the intensity of every Shu Jiguang is 5 milliwatts, time shutter is 8 seconds, and liquid crystal cell left standstill in the darkroom 10 minutes.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902002A (en) * | 2012-09-25 | 2013-01-30 | 浙江大学 | Reflection type volume holographic Bragg grating ultraviolet exposure method |
| WO2013013532A1 (en) * | 2011-07-26 | 2013-01-31 | 华中科技大学 | Method for preparing colorful three-dimensional hologram based on holographic polymer dispersed liquid crystal grating |
| WO2018014468A1 (en) * | 2016-07-18 | 2018-01-25 | 北京灵犀微光科技有限公司 | System and method for preparing polymer dispersed liquid crystal holographic grating |
| CN109856886A (en) * | 2019-03-28 | 2019-06-07 | 杭州光粒科技有限公司 | A kind of flexibility holographic polymer dispersed liquid crystal grating and preparation method thereof |
| US11703799B2 (en) | 2018-01-08 | 2023-07-18 | Digilens Inc. | Systems and methods for high-throughput recording of holographic gratings in waveguide cells |
| US12092914B2 (en) | 2018-01-08 | 2024-09-17 | Digilens Inc. | Systems and methods for manufacturing waveguide cells |
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2009
- 2009-02-01 CN CN200910045717A patent/CN101793987A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013013532A1 (en) * | 2011-07-26 | 2013-01-31 | 华中科技大学 | Method for preparing colorful three-dimensional hologram based on holographic polymer dispersed liquid crystal grating |
| CN102902002A (en) * | 2012-09-25 | 2013-01-30 | 浙江大学 | Reflection type volume holographic Bragg grating ultraviolet exposure method |
| CN102902002B (en) * | 2012-09-25 | 2014-06-25 | 浙江大学 | Reflection type volume holographic Bragg grating ultraviolet exposure method |
| WO2018014468A1 (en) * | 2016-07-18 | 2018-01-25 | 北京灵犀微光科技有限公司 | System and method for preparing polymer dispersed liquid crystal holographic grating |
| CN107632334A (en) * | 2016-07-18 | 2018-01-26 | 北京灵犀微光科技有限公司 | The preparation system and method for Holographically polymer dispersed liquid crystal grating |
| US11262698B2 (en) | 2016-07-18 | 2022-03-01 | Journey Technology, Ltd. | Preparation system and method for polymer-dispersed liquid crystal holographic grating |
| US11703799B2 (en) | 2018-01-08 | 2023-07-18 | Digilens Inc. | Systems and methods for high-throughput recording of holographic gratings in waveguide cells |
| US12092914B2 (en) | 2018-01-08 | 2024-09-17 | Digilens Inc. | Systems and methods for manufacturing waveguide cells |
| CN109856886A (en) * | 2019-03-28 | 2019-06-07 | 杭州光粒科技有限公司 | A kind of flexibility holographic polymer dispersed liquid crystal grating and preparation method thereof |
| CN109856886B (en) * | 2019-03-28 | 2022-04-29 | 杭州光粒科技有限公司 | Flexible holographic polymer dispersed liquid crystal grating and preparation method thereof |
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