Optical characterization of colloidal silica crystals with controlled size microspheres
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- 作者：A. Chaouachi ; R. Chtourou ; A. M鈥檔if ; A.H. Hamzaoui
- 关键词：Optical materials and properties ; Sol&ndash ; gel preparation ; Colloidal silica ; Photonic band gap
- 刊名：Materials Letters
- 出版年：1 February, 2014
- 年：2014
- 卷：116
- 期：Complete
- 页码：420-424
- 全文大小：1245 K
文摘
Colloidal multilayer structures of silica microspheres (or silica opals) have been developed on glass slides using vertical deposition technique. Effect of annealing on structural properties of colloidal silica was investigated using FTIR spectroscopy.
Morphology of particles was characterized using atomic force microscopy (AFM). AFM micrographs illustrate the uniform size distribution of silica microspheres in colloidal crystal. With the variation of molarities of reactants, sizes of particles are controlled. Photonic band gap calculations are carried out to show pseudo-photonic band gap of silica opals.
Optical characterization proves photonic character of colloidal crystals. It is noticed that forbidden photonic band gap depends on size of spheres forming colloidal crystal. Materials with controllable interesting photonic property are realized by easy and non expensive route and modifying position of stop-band allows to improved engineering of colloidal photonic crystals.