TY - JOUR AU - Castañeda-Uribe, Octavio Alejandro AU - Salcedo-Reyes, Juan Carlos AU - Méndez-Pinzón, Henry Alberto AU - Pedroza-Rodríguez, Aura Marina PY - 2010/06/10 Y2 - 2024/03/29 TI - Fabrication and optical characterization of a high-quality fcc-opal-based photonic crystal grown by the vertical convective self-assembly method JF - Universitas Scientiarum JA - Universitas Scientiarum VL - 15 IS - 2 SE - Physics DO - 10.11144/javeriana.SC15-2.faoc UR - https://revistas.javeriana.edu.co/index.php/scientarium/article/view/1371 SP - 150-158 AB - <p><strong>Objective:</strong> Fabrication and optical characterization of close-packed 225 nm SiO<sub>2</sub> -based colloidal crystals<strong>. Materials and methods:</strong> The vertical convective self-assembly method is used to grow high-quality 225 nm close-packed SiO<sub>2</sub>-based colloidal crystals. An annealing process (550°C) is made in order to improve the mechanical stability of the sample. Optical characterization is done by angle-resolved transmission spectroscopy (A-RTS) and structural characterization by Scanning Electron Microscopy (SEM). <strong>Results:</strong> Both, A-RTS and SEM, 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) SiO<sub>2</sub> based colloidal crystals are obtained. <strong>Conclusions:</strong> The growth of high-quality (long range order and defect-free) face centered cubic opal-based photonic crystals is reported.</p> <p><strong>Key words:</strong><em> </em>Photonic crystals, colloidal crystals, artificial opals, vertical convective deposition method, Bragg diffraction</p><br /><br /> ER -