Dynamics of peristrophic multiplexing in holographic polymer-dispersed liquid crystal

In this article, we derive a two-dimensional nonlocal diffusion model utilising finite difference time domain method, which describes the dynamics of how multiple holographic gratings are formed in a polymer-dispersed liquid crystal film for peristrophic multiplexing storage. This model takes into a...

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Bibliographic Details
Published in:Liquid crystals 2014-05, Vol.41 (5), p.673-684
Main Authors: He, Zhenghong, Chen, Chao Ping, Gao, Hongyue, Shi, Qiang, Liu, Shui, Li, Xiao, Xiong, Yuan, Lu, Jiangang, He, Gufeng, Su, Yikai
Format: Article
Language:English
Subjects:
diffraction efficiency
Diffusion
diffusion equations
Dynamics
Holograms
holographic gratings
Holography
Liquid crystal polymers
Liquid crystals
Mathematical models
Molecules
Multiplexing
PDLC
peristrophic multiplexing
Polymerization
Reaction kinetics
Recording
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Summary:In this article, we derive a two-dimensional nonlocal diffusion model utilising finite difference time domain method, which describes the dynamics of how multiple holographic gratings are formed in a polymer-dispersed liquid crystal film for peristrophic multiplexing storage. This model takes into account the diffusion processes of both the free monomer and the liquid crystal molecules, and the polymerisation kinetics in the overlapped regions of multiple holographic gratings. We have experimentally found out that there exists a bounce in the diffraction efficiency for multiplexed gratings at relatively low-exposure intensities, which is undesirable for recording the equal-strength holograms. Instead, the equal-strength holograms can be stored under relatively high-exposure intensities. To predict the occurrence of bounce, the temporal evolutions of the refractive index modulation are estimated and then verified by the experimental results. The appropriate holographic exposure intensity for recording the equal-strength hologram is suggested.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2013.875226