Fabrication And Application Of Structural Coloration Films Based On Responsive Photonic Band Gap

As the basis of information dissemination and communication in the biological world,color plays a vital role in the development of the whole nature.Environment-friendly,high-brightness,high-saturation structural colors were prepared by designing photonic band gap structures.The finite element analysis software COMSOL Multiphysics was used in this paper to simulate and calculate the influence of the size of the two-dimensional and three-dimensional photonic band gap structure on the structural coloration.Based on the research results,the responsive photonic band gap structure color thin films were prepared,and the characteristics of the films were studied,analyzed and applied.Firstly,the basic mechanism and characteristics of structural coloration was introduced,and the basic ways of structural coloration by different photonic band gap structures was analyzed,as well as the relationship between the properties of the substrate material and the stimulation-responsive color generation.The basic model of finite element method and the basic operation process of COMSOL Multiphysics software module was introduced,which lays a foundation for the next step of model building and simulation calculation.Thirdly,the feasibility of honeycomb-like two-dimensional photonic band-gap structure and opal and inverse opal three-dimensional photonic band-gap structure in the structural coloration was calculated and verified by COMSOL Multiphysics software.For different photonic band gap structures,the influence of size parameters and layer number changes on the structural coloration was studied.The results show that each photonic band-gap structure has a reflection peak in the range of visible light bands,which can be used for structural coloration.Finally,according to the simulation results,SiO₂ opal film was prepared by evaporation assembly method and dipping method,epoxy resin opal film was prepared by filling silica opal with epoxy resin,and epoxy resin inverse opal film was prepared by sacrificial template method,and the purity of structure color was improved by adding carbon black layer on the back of the film.The experimental results show that the inverse opal structural coloration film has the characteristics of stress and solution responsiveness and reconfigurable photonic band gap structure.Therefore,the application of thin films in rewritable photonic crystal paper was realized.The rewritable paper prepared has two rewritable ways.After repeated experiments,the feasibility and stability of the experimental method are verified.The prepared films have broad application prospects in the fields of anti-counterfeiting,sensing and reflective display.