The Simulation And Preparation Of Three-dimensional Photonic Crysta

Since1989, when Prof. Eli Yablonovitch first discovered periodic dielectricmaterial which has photonic band gap structure, photonic crystal began to beconcerned by the majority of researchers because of its special effects generatedby periodic structure. Known as optical semiconductors, photonic crystals whichcan be used to produce high-performance optics, have significant applications inthe field of the integrated optoelectronics. Furthermore photonic crystals havepotential application in many fields such as Sensing technology, solar battery,optical fiber communication etc. On the other hand, photonic crystals can be usedas a template and a mask, and be helpful to nanostructure of other materials.In this paper, it mainly tells new thoughts about simulation and fabrication ofphotonic crystals and simulation calculation. The main researches are as follows.I. This paper describes the basic idea of scalar wave approximation methodand calculation steps of the method, focused on research for the photonic band gap.Improve of the scalar wave approximation method.Improve the formula of thismethod and add the angle of incident light.Then use this method to simulate theoptical properties of three-dimensional photonic crystals. By analyzing the factorsof photonic band gap, we found the factors of preparing photonic crystals arediameter of Polystyrene (PS) microspheres, photonic crystals duty cycle andpermittivity of two-cycle position. By scalar wave approximation, simulatethree-dimensional photonic band gap position and band gap width, then comparewith result of the experiment.II. Prepare polystyrene3-dimensional photonic crystals by flow controlvertical deposition method, and analyze and improve preparation parameters.Process parameters of preparation of photonic crystal: selection of the massfraction of0.6%PS mono disperse microspheres, experimental temperatureadjusted to36℃by heater,200μm per minute of speed of peristaltic pumpextracting lotion. III. Change the property of photonic crystals by annealing the toluene vapor,and make photonic crystal hetero structure. Test the optical properties, and thenfind out the total width of two kinds of photonic crystals. Improve the experimentby theoretical analysis and the method of material structure for the scalar waveapproximation, and compare with the result.IV. Use photonic crystals as a template to prepare inverse opal structure BFOmaterial. Fill the photonic crystals with BFO precursor, which is prepared bysol-gel, and obtain inverse opal structure BFO material by calcination. Identify itsstructure and material purity by SEM, XRD, reflectance spectroscopy etc. As BFOcan degrade pollution, we could do photo catalytic degradation experiments onAnti-protein structure BFO, and compare the experimental results. It shows that inthis experiment in which use Rhodamine B as the polluted sources, the photocatalytic degradation efficiency of inverse opal structure BFO is2times higherthan normal.Process parameters for preparation of inverse opal structure BFO: use0.27msol-gel as precursor of BFO, and fill with sol-gel twice or3times, regarding tocalcination temperature, use slow heating mode to rise to500℃,and last2hours,during this period make it200℃for30minutes.