双重调制液晶光子晶体的光控行为及显微结构研究

The liquid crystal materials have variety of field response characteristics. The photonic crystals to achieve the control photonic band gap by liquid crystals. Method to the photonic crystal photonic band gap filling liquid crystal material regulation, tunable scope is limited, can’t meet the requirements of the rapid response of optical communication. This project is based on the photonic crystal and cholesteric liquid crystalline elastomers (LCEs) as the research object. By combining light responsive chromophore, the photonic crystal film with controllable gap of microsphere can be fabricated. Research on the deformation and reversible phase transition of LCEs in response to light or heat, will clarify the mechanism of LCEs photocontrolled phase transformation on the photonic band gap modulation. To reveal dual-tunable mechanism of the photocontrolled behavior of LCEs and the photonic crystal control photonic band gap.This research work broke through the design limitations of the photonic crystal.The response characteristics of the external environment by using liquid crystal elastomers change the refractive index and the crystal lattice structure parameters, realized the dual modulation of band gap. The results provide the technical support for quick response liquid crystal photonic crystal in optical communication.

液晶材料具有多种外场响应特性，在光子晶体中填充液晶实现了外场对光子带隙的调控。光子晶体中填充液晶材料调节光子带隙的方法，使光子带隙的调控范围受到限定，不能满足光通讯快速响应、连续调控的要求。本项目综合光子晶体与胆甾型液晶弹性体的特性，拟定在液晶弹性体中引入光响应基团，通过调控小分子液晶填充空间，研究光对液晶弹性体微观结构与可逆相结构的调控机制，揭示显微结构与光子带隙的内在联系。阐明液晶弹性体和光子晶体对光子带隙的双重调控机制。本项目的研究工作突破了光子晶体设计上改变介质材料而获得新性能的局限性。利用液晶弹性体对外部环境的响应特性改变折射率和晶格结构等参数，实现带隙的双重调制。为液晶光子晶体在光通讯中快速响应提供技术支持。

液晶、光子晶体、形状记忆聚合物等均具有多种外场响应特性，本项目利用多种响应材料的协同作用实现外场对光子带隙的调控。本项目综合光子晶体（反蛋白石结构）与响应材料的特性，通过调控填充光子晶体模板间隙的响应材料，研究外界刺激条件（如，光，热，电等）对材料体系微观结构与可逆相结构的调控机制，揭示响应材料显微结构与光子带隙的内在联系。阐明多重外场响应材料和光子晶体对光子带隙的双重调控机制。本项目的研究工作突破了光子晶体设计上改变介质材料而获得新性能的局限性。利用响应材料对外部环境的响应特性改变折射率和晶格结构等物理参数，实现带隙的双重调制。本项目研究成果在指纹信息存储、拉曼信号增强等器件上的应用取得了初步结果。