基于丙烯酸酯的全息聚合物分散液晶光栅的动力学理论研究

Kinetics theory investigation of holographic polymer dispersed liquid crystal based on acrylate

采用一维无限长模型分析法对全息聚合物分散液晶(HPDLC)做了动力学方面的研究,给出了相关的扩散动力学方程和聚合动力学方程,并与折射率调制度Δn相结合获得了光栅衍射效率的表达式,对HPDLC光栅性能的改善提供了理论上的指导.

Holographic polymer-dispersed liquid crystal （HPDLC） is formed by the diffusion of monomers and liquid crystals as a kind of switchable volume holography. The kinetics investigation of HPDLC is very important to improve the diffraction efficiency and optimize the formation conditions of HPDLC. Fourier analysis is widely adopted as analytical method of kinetics. In this paper, we make use of the one-dimensional infinite-length analytical method to develop a kinetics simulation for the real-time formation of the grating. Simultaneously, corresponding diffused kinetics equations and polymeric kinetics equations are given. Then, we find the relationship between these equations and refractive index modulation An, and obtain a diffraction efficiency equation which is appropriate for transmission Bragg volume grating. Finally, the ways of increasing diffraction efficiency of HPDLC is discussed. Our theoretical study should provide some useful guidance to improve the properties of HPDLC.