TAILIEUCHUNG - Advances in Lasers and Electro Optics_3

Tham khảo sách 'advances in lasers and electro optics_3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 25 High Performance Holographic Polymer Dispersed Liquid Crystal Systems Formed with the Siloxane-containing Derivatives and Their Applications on Electro-optics Yeonghee Cho and Yusuke Kawakami Japan Advanced Institute of Science and Technology Japan 1. Introduction Holography is a very powerful technology for high density and fast data storage which have been applied to the systems known as holographic polymer dispersed liquid crystal HPDLC in which gratings are formed by anisotropic distribution of polymer and LC-rich layers through photopolymerization of monomers or oligomers and following phase separation of LC in the form of interference patterns of incident two laser beams 1-5 . Much attentions have been attracted to HPDLC systems due to their unique switching property in electric field to make them applicable to information displays optical shutters and information storage media 6-15 . Many research groups have made efforts to realize useful recording materials for high performance holographic gratings 16-18 . Photo-polymerizable materials typically multifunctional acrylates epoxy and thiol-ene derivatives have been mostly studied because of their advantages of optical transparency large refractive index modulation low cost and easy fabrication and modification 19-25 . . Bunning group has reported investigation that the correlation between polymerization kinetics LC phase separation and polymer gel point in examining thiol-ene HPDLC formulations to enable more complete understanding of the formation of thiol-ene HPDLCs 26 . Kim group has developed that the doping of conductive fullerene particles to the formulations based on polyurethane acrylate oligomers in order to reduce the droplet coalescence of LC and operating voltage 27 . Further extensive research has been devoted to the organic-inorganic hybrid materials having the sensitivity to visible laser beam to resolve the drawbacks of photopolymerizable materials such as volume shrinkage low .

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