Liu Peng, Zhao Yu, Li Zeren, Sun Xiudong
Opt Express. 2018 Mar 19;26(6):6993-7004. doi: 10.1364/OE.26.006993.
This work demonstrates the grating formation of bulk nanoparticle polymer composites through an improved interference optical system under ultrafast nanoseconds exposure of a silver nanoprisms (NPs) dispersed photo-polymerizable mixture in the case of 532 nm wavelength. The polymerizable mixture is composed of phenathrenequinone (PQ) (photoinitiator) and methyl methacrylate (MMA) (monomer). The mechanism in this bulk nanoparticle polymer composite is analyzed by mixing nonlocal polymerization driven diffusion (NPDD) model and absorption modulation caused by the spatial concentration distribution difference of silver NPs. We find that the attenuation of diffraction efficiency under pulsed exposure is due to the reciprocity law failure. This work presents an analysis of the cause of reciprocity failure and improvement in holographic properties by doping silver NPs. The optimized photopolymer presents diffraction efficiencies as high as 51.4% with 1.8 μs cumulative pulsed exposure. Cumulative gratings strength is also enhanced by 70% while doping silver NPs under 1.5 μs cumulative pulsed exposure.
这项工作展示了在532纳米波长下，通过改进的干涉光学系统，在超快纳秒级曝光分散有银纳米棱镜（NPs）的可光聚合混合物时，块状纳米颗粒聚合物复合材料的光栅形成。可光聚合混合物由菲醌（PQ）（光引发剂）和甲基丙烯酸甲酯（MMA）（单体）组成。通过将非局部聚合驱动扩散（NPDD）模型与银纳米颗粒空间浓度分布差异引起的吸收调制相结合，分析了这种块状纳米颗粒聚合物复合材料中的机制。我们发现脉冲曝光下衍射效率的衰减是由于互易律失效。这项工作分析了互易失效的原因，并通过掺杂银纳米颗粒改善了全息特性。优化后的光聚合物在1.8微秒累积脉冲曝光下的衍射效率高达51.4%。在1.5微秒累积脉冲曝光下掺杂银纳米颗粒时，累积光栅强度也提高了70%。
