TiO_(2)纳米颗粒对染料掺杂聚合物分散液晶的随机激光辐射特性的影响  

Effect of TiO_(2) nanoparticles on the random laser radiation characteristics of dye-doped polymer dispersed liquid crystal

作　　者：曹明轩 王志文 张彦军 杜大明 汤健华 杨保健 CAO Mingxuan;WANG Zhiwen;ZHANG Yanjun;DU Daming;TANG Jianhua;YANG Baojian(Department of Intelligent Manufacturing,Wuyi University,Jiangmen 529000,China)

机构地区：[1]五邑大学智能制造学部,广东江门529000

出　　处：《光学技术》2021年第3期334-338,共5页Optical Technique

基　　金：广东省重点领域研发计划(2020B090922004);广东省教育厅青年创新人才项目(2017KQNCX203,2018KQNCX264);江门市科技计划项目(2019030101920008832;2020030102130005402)。

摘　　要：随机激光的阈值与体系内的散射强度存在密切关系。高折射率二氧化钛(TiO2)纳米颗粒与染料掺杂聚合物分散液晶(DDPDLC)均匀混合后,由于液晶微滴与TiO2纳米颗粒之间的强散射作用,DDPPLC的随机激光具有更低的激光发射阈值,并且随TiO2纳米颗粒的掺杂浓度而变化;在优化TiO2纳米颗粒掺杂浓度的基础上,DDPDLC的发射阈值为270μJ/cm2,线宽下降至0.08nm;温度实验证明了PDLC结构的散射是产生随机激光的主要工作机制,在TiO2纳米颗粒掺杂后,DDPDLC样品依然保证了良好的可调性。The threshold of random laser light is closely related to the scattering intensity in the system. After the high refractive index titanium dioxide(TiO2) nanoparticles and the dye-doped polymer dispersed liquid crystal(DDPDLC) were uniformly mixed, due to the strong scattering effect between the liquid crystal droplets and the TiO2 nanoparticles, DDPPLC’s random laser had a lower lasing threshold, which varied with the doping concentration of TiO2 nanoparticles. On the basis of optimizing the doping of TiO2 nanoparticles, the emission threshold of DDPDLC was as low as 270μJ/cm2, and the linewidth was reduced to 0.08 nm. Finally, the temperature experiments proved that the scattering of PDLC structure was the main working mechanism for the generation of random lasers. After TiO2 doping, the DDPDLC samples still ensured a good tunability.

关 键 词：随机激光 聚合物分散液晶 染料掺杂 激光发射 液晶微滴 线宽 散射强度 TiO_(2)纳米颗粒 

分 类 号：TN244[电子电信—物理电子学] TH243[机械工程—机械制造及自动化]