Luo Wei-Cheng, Xu Yao-Dong, Yu Guan-Xiong, Li Sen-Sen, Li Han-Ying, Chen Lu-Jian
Opt Express. 2020 Jun 8;28(12):17307-17319. doi: 10.1364/OE.392992.
Polymer-templated nematic liquid crystal (LC) holographic gratings via visible-light recording are presented in the presence of reactive mesogens (RMs) and rose bengal (RB)/N-phenylglycine (NPG) photoinitiation systems. By optimizing the concentration of RMs in the polymer-templated LC gratings, the template after being washed out can be refilled with suitable fluidic components. And the dependence of the first-order diffraction efficiency (DE) on the concentration of RB and NPG molecules was discussed in detail. The polarization-dependency of diffraction properties was also investigated. It is revealed that the diffractive behaviors of polymer-templated LC gratings can be dynamically reconfigured by varying temperature or refilling organic solutions with different refractive index (RI). Furthermore, the potential for recording holograms using green light is explored. We expect that the reconfigurable polymer-templated LC gratings fabricated via visible-light interference would provide a facile approach to regulate the diffraction properties of holographic gratings apart from electric field, thus paving a way towards a class of novel anti-counterfeiting devices.
介绍了在反应性液晶基元（RMs）和玫瑰红（RB）/N-苯基甘氨酸（NPG）光引发体系存在下，通过可见光记录制备聚合物模板向列相液晶（LC）全息光栅的方法。通过优化聚合物模板LC光栅中RMs的浓度，洗去模板后可用合适的流体成分重新填充。详细讨论了一阶衍射效率（DE）对RB和NPG分子浓度的依赖性。还研究了衍射特性的偏振依赖性。结果表明，通过改变温度或用不同折射率（RI）的有机溶液重新填充，聚合物模板LC光栅的衍射行为可以动态重构。此外，还探索了使用绿光记录全息图的潜力。我们期望通过可见光干涉制备的可重构聚合物模板LC光栅，除电场外，能为调节全息光栅的衍射特性提供一种简便方法，从而为一类新型防伪装置铺平道路。
