Research On Preparation And Optics Performance Of Photonic Crystals Structure Color Films

Structural color is favored by many researchers due to its high saturation,high brightness and never fading.In recent years,the research on structural color has been heating up,especially the structural color produced by artificially prepared photonic crystals has become a hot topic in the research field.The emergence of photonic crystals is a tremendous progress made by mankind since integrated circuits.Photonic crystals are ideal structures for generating structural colors,and because of their unique photonic band gaps,they can control light.However,due to the scarcity of natural photonic crystal opal structures in nature,artificially prepared photonic crystal structure colors have become a hotspot of current research.In order to study how to prepare high-performance,high-quality photonic crystals and their band gap performance,the main research contents are summarized as follows:(1)The modified stober method was used to successfully prepare SiO2 microspheres with good monodispersity and different particle diameters by changing TEOS,ammonia,reaction temperature,and reaction time during the experiment.Infrared spectrometer,scanning electron microscope,and X-ray were used.Diffraction methods were used to characterize the synthesized SiO2 microspheres.The photonic crystal structure color films were prepared by using SiO2 microspheres with different particle diameters.The results show that the results of photonic crystal interaction with light conform to the Bragg diffraction law.As the particle size of the microspheres continues to increase,the center wavelength corresponding to the photonic band gap of the photonic crystal structure color film moves toward the long wave direction,that is,a red shift occurs.With the increase of the incident angle,the center wavelength corresponding to the photon band gap moves toward the short wave direction,that is,a blue shift occurs.When the heat treatment temperature of the film keeps increasing,the center wavelength corresponding to the photon band gap moves to the short-wave direction,that is,blue shift.(2)Polystyrene microspheres with different particle sizes were prepared by emulsion polymerization and soap-free emulsion polymerization.The PS microspheres were characterized by infrared spectroscopy,x-ray diffraction,and thermogravimetric analysis.Photonic crystal structured thin films were prepared from polystyrene microspheres with different particle sizes,and their surface morphology and optical properties were characterized.The results show that with the continuous increase of PS microspheres,the center wavelength corresponding to the photonic band gap of the photonic crystal structure color film moves to the long wave direction,that is,red shift;when the PS microspheres have a smaller particle size,the photonic band The corresponding central wavelength theoretical value is closer to the experimental value;compared to the pull-up method,the surface morphology of the structured color film prepared by the gravity sedimentation method is more regular,but the structured color film prepared by the pull-up method has more structured hue and saturation higher(3)The finite-difference time-domain method was used to specifically study the band size of the dielectric sphere and the lattice constant.The influence of the gap width and the location of the band gap.The results show that when the size of the dielectric spheres is the same and the lattice spacing is different,the position where the photon band gap appears moves from high frequency to low frequency with the increase of the lattice spacing,and the change law of the band gap width increases first and then decreases.When the spherical spacing of the dielectric spheres is the same and the particle diameters are different,the position of the band gap of the photonic crystal moves from high frequency to low frequency with the increase of the particle diameter,and the change law of the band gap width also increases first and then decreases.