Preparation and optical properties of SiO₂ photonic crystal structure color films

Abstract

In order to study the band gap performance of structural color films under different conditions, Monodisperse submicron silica microspheres with different particle sizes were prepared by the modified Stöber method, and a photonic crystal structure color film with silica as a structural element was prepared on the surface of the glass by vertical deposition self-assembly. The morphology and optical properties of microspheres and films were analyzed by scanning electron microscope, infrared spectrometer and UV-vis spectrophotometer. The results show that during the synthesis process, with the increase of the reaction temperature, the particle size of silica microspheres gradually reduces; with the increase of the diameter of SiO2 microspheres, the corresponding photonic band gap of photonic crystals occurs red shifting. It is found through further study that as the angle between the incident light and the normal line of color film increases, the center wavelength corresponding to the photonic band gap becomes shorter, then blue shifting occurs.

Keywords

• silica microsphere
• structural color
• photonic band gap
• incident angle
• optical property