Investigation Of Self-organized Sub-micron Periodic Structures And Their Photonic Bandgap Properties

Photonic bandgap (PBG) materials (photonic crystals) with regular periodicity of dielectric structures are the frontier of functional materials for their ability in manipulating photons. This dissertation focuses on the sub-micron self-assembled photonic crystals. The preparation methods, microstructures and optical properties of 2-dimensional and 3-dimensional sub-micron periodic structures were studied systematically.2-dimensional template of monolayer microspheres with ordered close-packed hexagonal lattice has been assembled by electric-field-induced deposition process against gravity, and 3-dimensional opal template of multilayer microspheres with face-centered cubic lattice has been assembled by the combined action of evaporation and surface tension respectively. The kinetic model of the microsphere template's assembly process was analyzed also. Self-assembled opals possess pseudo photonic bandgap, and the bandgap property was influenced by the defects of template drastically. The microsphere lattice's structural parameters can be changed by annealing polymer opal templates at elevated temperature; it provides the possibility to fine-tune the bandgap properties of photonic crystals irreversibly.PLZT, TiO2 and Zn2SiO4:Mn2+(ZMS) functional ceramic inverse opals with different infilling ratios have been fabricated by sol-gel process. It testifies that sol-gel process is fit for the preparation of different sorts of ceramic matrix inverse opal materials universally. The crystalline forms of ceramic matrix inverse opal materials are changed distinctly with the increase of treating temperature. The thickness of the inverse opal materials has been estimated by analyzing the Fabry-Perot fringe in reflective spectra.It is confirmed that ferroelectric PLZT inverse opal materials possess electrically tunable Photonic bandgap for the first time. The bandgap position shifts continuously to long-wavelength with increasing of the applied electric field. It should supply a more reliable mode to design the novel electric controlled optical switch based on the superprism effect in photonic crystals.Different crystal planes of luminescent Zn2SiO4:Mn2+ inverse opals forbid the light propagation falling in the directional bandgaps though there is no complete bandgap in Zn2SiO4:Mn2+ inverse opals, leading to the inhibition of spontaneous emission in certain directions. The microstructure analysis of the butterfly wing's squamae with structure color properties shows that the specific bio-tissue is patterned with 2D ordered periodic dielectric changes. Three typical modes for the color display have been summarized as: raster (2-dimensional PBG) reflection, regressive reflection and pigment colored diffusion. The 2D ordered inverse structure of butterfly wing's squamae formed by ceramic matrix has been fabricated through sol-gel process for the first time.