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Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases
ACS Omega ( IF 3.7 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acsomega.7b01149
Hiroshi Kakiuchida 1 , Akifumi Ogiwara 2 , Akihiko Matsuyama 3
Affiliation  

We first fabricated holographic polymer-dispersed liquid crystals (HPDLCs) that produce multiple Bragg diffractions with different polarization states for every angle of incidence, through a photopolymerization-induced phase separation by one-time interferential exposure. The polarizations of the Bragg diffractions were well-controlled at individual wavelengths in the fabrication process by the compositional ratio of LCs to monomers. The raw mixtures of extremely low-functionality monomers having very different viscosities were used to reduce the domain size in phase separation and subsequently to form elaborate periodic structures of the LC and polymer phases. A cross-linker (1-vinyl-2-pyrrolidione) and a prepolymer with urethane groups were employed to strengthen the polymer network. Note that the diffractions of our HPDLCs are regarded as not purely but mostly Bragg type, according to the evaluation with the established criteria. The devices, which are monolithic but versatile in diffractive behaviors, have advantages of simple manufacturing and handling.

中文翻译:

液晶/聚合物周期相组成的具有不同波长和偏振的多个布拉格衍射

我们首先制造了全息聚合物分散的液晶(HPDLC),该液晶通过一次干涉曝光通过光聚合引发的相分离,在每个入射角上产生具有不同偏振态的多个布拉格衍射。在制造过程中,通过LC与单体的组成比,布拉格衍射的偏振在各个波长上得到了很好的控制。具有非常不同粘度的极低官能度单体的原始混合物用于减小相分离中的畴尺寸,并随后形成液相色谱和聚合物相的精细周期性结构。使用交联剂(1-乙烯基-2-吡咯烷酮)和具有氨基甲酸酯基团的预聚物来增强聚合物网络。请注意,根据建立的标准进行的评估,我们的HPDLC的衍射被认为不是纯粹的而是大部分是布拉格类型的。这些装置是整体的,但在衍射行为方面是通用的,具有制造和处理简单的优点。
更新日期:2017-09-22
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