Ogiwara Akifumi, Watanabe Minoru, Moriwaki Retsu
Appl Opt. 2013 Sep 10;52(26):6529-36. doi: 10.1364/AO.52.006529.
Grating devices using photosensitive organic materials play an important role in the development of optical and optoelectronic systems. High diffraction efficiency and polarization dependence achieved in a holographic polymer-dispersed liquid crystal (HPDLC) grating are expected to provide polarization-controllable optical devices, such as a holographic memory for optically reconfigurable gate arrays (ORGAs). However, the optical property is affected by the thermal modulation around the transition temperature (T(ni)) where the liquid crystal (LC) changes from nematic to isotropic phases. The temperature dependence of the diffraction efficiency in HPDLC grating is investigated using four types of LC composites comprised of LCs and monomers having different physical properties such as T(ni) and anisotropic refractive indices. The holographic memory formed by the LC with low anisotropic refractive index and LC diacrylate monomer implements optical reconfiguration for ORGAs at a high temperature beyond T(ni) of LC.
使用光敏有机材料的光栅器件在光学和光电子系统的发展中发挥着重要作用。全息聚合物分散液晶（HPDLC）光栅所实现的高衍射效率和偏振依赖性有望提供偏振可控光学器件，例如用于光可重构门阵列（ORGAs）的全息存储器。然而，光学性质会受到转变温度（T(ni)）附近热调制的影响，在该温度下液晶（LC）从向列相转变为各向同性相。使用由具有不同物理性质（如T(ni)和各向异性折射率）的液晶和单体组成的四种类型的液晶复合材料，研究了HPDLC光栅中衍射效率的温度依赖性。由具有低各向异性折射率的液晶和液晶二丙烯酸酯单体制成的全息存储器，在高于液晶T(ni)的高温下实现了用于ORGAs的光学重构。
