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为了改善现有聚合物分散液晶(PDLC)光子晶体(PC)的制备方法和电光特性,利用532nm激光干涉条纹引发聚合物和液晶的混合物相分离,采用全息两次不等时曝光的方法,即第1次曝光完成后,将样品沿基板中心法线旋转60°进行第2次曝光,制备得到电可调谐的二维三角格子的PDLC-PC。实验结果表明,两次曝光的时间对聚合物和液晶的相分离程度影响很大,用偏光显微镜观察优化条件下制备得的二维PDLC-PC发现,聚合物和液晶在二维空间上呈规则的三角格子周期性分布。用波长为633nm的He-Ne激光器探测得到在未施加电压时不同晶格常数的PDLC-PC的衍射图样,并根据一级衍射的电光变化曲线,可以看到,其衍射效率可以利用电场进行有效的调节。
In order to improve the preparation method and electro-optic properties of the existing polymer dispersed liquid crystal (PDLC) photonic crystals (PC), a mixture of polymer and liquid crystal is induced to phase separate using a 532 nm laser interference fringe, and a holographic twice- After the first exposure was completed, the sample was rotated through 60 ° at the center of the substrate for the second exposure to prepare an electrically tunable two-dimensional triangular lattice PDLC-PC. The experimental results show that the time of the double exposure has a great influence on the phase separation of the polymer and the liquid crystal. The observation of the two-dimensional PDLC-PC prepared under the optimized conditions by a polarized light microscope shows that the polymer and the liquid crystal are regular in the two-dimensional space The triangular lattice periodically distributed. The diffraction pattern of PDLC-PC with different lattice constants when no voltage was applied was detected by He-Ne laser with wavelength of 633nm. According to the electro-optic curve of first-order diffraction, it can be seen that the diffraction efficiency can be effectively controlled by the electric field Adjustment.