Spatial Frequency Responses of Anisotropic Refractive Index Gratings Formed in Holographic Polymer Dispersed Liquid Crystals

被引：7
作者：
Fukuda, Yoshiaki [1 ]
Tomita, Yasuo [1 ]
机构：
[1] Univ Electrocommun, Dept Engn Sci, 1-5-1 Chofugaoka, Chofu, Tokyo 1828585, Japan
来源：
MATERIALS | 2016年 / 9卷 / 03期
关键词：
holographic polymer dispersed liquid crystal; photopolymer; nematic liquid crystal; phase separation; holographic grating formation; Bragg grating; INDUCED PHASE-SEPARATION; DIFFUSION-MODEL; DISTRIBUTION MORPHOLOGY; DIFFRACTION EFFICIENCY; PHOTONIC CRYSTALS; MASS-TRANSFER; PHOTOPOLYMERIZATION; THIOL; KINETICS; MONOMER;
D O I：
10.3390/ma9030188
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report on an experimental investigation of spatial frequency responses of anisotropic transmission refractive index gratings formed in holographic polymer dispersed liquid crystals (HPDLCs). We studied two different types of HPDLC materials employing two different monomer systems: one with acrylate monomer capable of radical mediated chain-growth polymerizations and the other with thiol-ene monomer capable of step-growth polymerizations. It was found that the photopolymerization kinetics of the two HPDLC materials could be well explained by the autocatalytic model. We also measured grating-spacing dependences of anisotropic refractive index gratings at a recording wavelength of 532 nm. It was found that the HPDLC material with the thiol-ene monomer gave higher spatial frequency responses than that with the acrylate monomer. Statistical thermodynamic simulation suggested that such a spatial frequency dependence was attributed primarily to a difference in the size of formed liquid crystal droplets due to different photopolymerization mechanisms.
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页数：16
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