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Preparation and Study of Tow-dimensional Polyme/liquid Crystal Holographic Grating

Author: LiHongLiang
Tutor: SongJing
School: Changchun University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Holographic polymer dispersed liquid crystal Diffraction efficiency Drive voltage Phase separation
CLC: TN256
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Holographic polymer dispersed liquid crystal (Holographic polymer dispersed liquid crystals, HPDLCs) grating as a new type of optical components in the measurement, radio astronomy, integrated optics, optical communications and information processing, and many other fields have a wide range of applications. Traditional gratings are one-dimensional structure, the prepared sample in the two beams of interference light beam of the light field at the exposure, the photosensitive monomer polymerized to form the structure of mutually parallel equal width equal intervals in the horizontal direction, in the sample records only a grating; herein study the two-dimensional grating may be recorded simultaneously in the sample with the two grating structure, which is equivalent in the sample at the same time recorded in the two orthogonal one-dimensional grating structure, and methods for their preparation are mixed uniform photosensitive monomer material and a liquid crystal is injected into the liquid crystal cell, the samples were exposed for a period of time, and then the sample is rotated 90 degrees, then the exposure time, so that the photosensitive monomer is polymerized in two directions obtained in double-beam laser interferometer. Dimensional grating the diffraction pattern formed at the light incident when the space lattice, and in addition to the above application can also be used for the beam splitter in the optical interconnection, a modulator and a coupling device, to broaden the range of applications of the grating. Although the two-dimensional holographic polymer dispersed liquid crystal grating application is very wide, but the preparation method is not mature, there are still many problems, mainly photopolymerization reaction phase separation is incomplete, the diffraction efficiency is low, the grating drive voltage is too high, the poor stability of the devices. Firstly, selection and research on the experimental system used in the liquid crystal, chemical materials, analysis of the photoinitiator in the photopolymerization reaction of the chemical rearrangement process, to study the mechanism of phase separation of polymer and liquid crystal; Secondly, by varying the illumination time, the light intensity, etc. parameters, to study the role played by the various components in the photopolymerizable and impact, increasing the degree of photopolymerization reaction, to obtain the two-dimensional polymer / liquid crystal grating having a clear phase separation structure and a high diffraction efficiency; Again, based on an diffraction efficiency analysis of influencing factors, to select the different effect of additives to improve the the photoreaction efficiency, increase the degree of phase separation; choose a fluorine-containing monomer material and a plasticizer DOP to improve the grating morphology to enhance the diffraction efficiency of the grating, and reduced the driving voltage of the grating; Finally, by the design and improvement of the optical path through two exposure SYSTEM prepared having good phase separation interface, and having a high diffraction efficiency and low driving voltage of the two-dimensional polymer / liquid crystal grating. Finally, the optical path to adjust, to prepare a small periodic two-dimensional polymer / liquid crystal grating.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Integrated optical devices
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