Surface On The Substrate Preparation Of The Colloidal Crystals

Photonic crystals had received considerable attention over past several years since it was first proposed independently by Yabalonovich and John in 1987. Colloidal crystal was 3D orderly and periodic structures made from monodisperse nanospheres using self-assembly methods under suitable conditions. The self-assembly colloidal crystal provided a cost-effective, facile and effective way to investigate 3D photonic crystal. Photonic crystal fiber have attracted wide attention in recent years. It was generally two-dimensional structure. Its cross-sectional surface was usually arranged with different forms of porosity. The light can be limited to the disseminate in the core area of fiber. Therefor a new 3D photonic crystal fiber, which is formed by fabricating photonic crystals in capillary, provided a innovative value and important significance. The main research work in this paper can be summarized and demonstrated as follows:Colloidal crystals were fabricated on surface of cylinder by vertical deposition technique. Surface morphology of colloidal crystal was carried out with optics microscope and scanning electron microscope. Only a small number of defects can be observed by scanning electron microscope on the surface of the sample prepared by this method. Photonic gaps of colloidal crystals fabricated on cylinder of different radius were measured with optics test system. The role of radius of curvature was investigated. The suitable temperature for sio2 nanospheres of 690mn was obtained by comparing colloidal crystal fabricated under different temperatures. The structure of colloidal crystal fabricated on surface of cylinder was studied.Colloidal crystals were self-assembled in the glass capillary. Colloidal crystal in capillary was characterized with scanning electron microscope. The SEM showed that nanospheres arranged closely.Then two preprocessed fibers were coupled with a colloidal crystal filled in glass capillary. Photonic gap was measured with optics test system. The spectrogram showed high-quality colloidal crystals were fabricated in the glass capillary. Self-assemblely mechanism in glass capillary was investigated.