全息聚合物分散液晶中形成的各向异性折射率光栅的空间频率响应
Spatial Frequency Responses of Anisotropic Refractive Index Gratings Formed in Holographic Polymer Dispersed Liquid Crystals.
作者信息
Fukuda Yoshiaki, Tomita Yasuo
机构信息
Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
出版信息
Materials (Basel). 2016 Mar 10;9(3):188. doi: 10.3390/ma9030188.
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.
我们报告了对全息聚合物分散液晶（HPDLC）中形成的各向异性透射折射率光栅的空间频率响应进行的实验研究。我们使用两种不同的单体体系研究了两种不同类型的HPDLC材料：一种是具有能够进行自由基介导链增长聚合的丙烯酸酯单体，另一种是具有能够进行逐步增长聚合的硫醇-烯单体。结果发现，两种HPDLC材料的光聚合动力学可以用自催化模型很好地解释。我们还测量了在532nm记录波长下各向异性折射率光栅的光栅间距依赖性。结果发现，含有硫醇-烯单体的HPDLC材料比含有丙烯酸酯单体的材料具有更高的空间频率响应。统计热力学模拟表明，这种空间频率依赖性主要归因于不同光聚合机制导致的所形成液晶微滴尺寸的差异。
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