Fabrication and optical characterization of a high-quality fcc-opal-based photonic crystal grown by the vertical convective self-assembly method

Universitas Scientiarum

关键词: Photonic crystals;    colloidal crystals;    artificial opals;    vertical convective deposition method;    Bragg diffraction;   

DOI  :  

来源: DOAJ

【 摘 要 】

Fabrication and optical characterization of close-packed 225 nm SiO2 -based colloidal crystals. Materials and methods: Thevertical convective self-assembly method is used to grow high-quality 225 nm close-packed SiO2-based colloidal crystals. An annealingprocess (550°C) is made in order to improve the mechanical stability of the sample. Optical characterization is done by angle-resolvedtransmission spectroscopy (A-RTS) and structural characterization by Scanning Electron Microscopy (SEM). Results: Both, A-RTS andSEM, show that with the vertical convective self-assembly method, with the appropriate parameters of temperature of evaporation (60°C),volume fraction of the colloidal suspension (0.2% w/w) and acidity (pH=6), highly ordered close packed face centered cubic (fcc) SiO2based colloidal crystals are obtained. Conclusions: The growth of high-quality (long range order and defect-free) face centered cubic opalbased photonic crystals is reported.

【 授权许可】

Unknown