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Title: Fabrication and characterization of photonic crystals
Keywords: colloidal crystals, photonic crystals, photonic bandgap, surfactant, sedimentation, vertical deposition
Issue Date: 25-Oct-2005
Citation: WANG YANHUA (2005-10-25). Fabrication and characterization of photonic crystals. ScholarBank@NUS Repository.
Abstract: In our studies, high-quality colloidal crystals with the typical size of a single crystalline domain larger than 200 micrometer were fabricated from colloidal particles by sedimentation and vertical deposition. Their reflectance spectra measured with UV-Vis spectrometer show that they possess photonic stop bandgaps. Consequently, we investigated the effect of surfactants on the array fashion of the colloidal crystals and found that the square array was favorable to form in the presence of surfactants. Also, we explored a new procedure for fine tuning the photonic bandgap properties of three-dimensional silica colloidal crystals by pre-heating treatment. Furthermore, we fabricated crystals of air spheres in titania using colloidal crystal templating method. Their stop bandgaps were proved with micro-FTIR transmission spectra. Additionally, SDS was added into the infiltration material (TPT) and achieved tight coating of TiO2 on the polystyrene microspheres.
Appears in Collections:Master's Theses (Open)

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