Fabrication and optical characterization of a high-quality fcc-opal-based photonic crystal grown by the vertical convective self-assembly method
Objective: Fabrication and optical characterization of close-packed 225 nm SiO2 -based colloidal crystals. Materials and methods: The vertical convective self-assembly method is used to grow high-quality 225 nm close-packed SiO2-based colloidal crystals. An annealing process (550°C) is made in orde...
| Autor Principal: | Castañeda-Uribe, Octavio Alejandro; Grupo de Películas Delgadas, Departamento de Física. Facultad de Ciencias. Pontificia Universidad Javeriana, Bogotá, D.C. |
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| Otros Autores: | Salcedo-Reyes, Juan Carlos; Grupo de Películas Delgadas, Departamento de Física. Facultad de Ciencias. Pontificia Universidad Javeriana, Bogotá, D.C., Méndez-Pinzón, Henry Alberto; Grupo de Películas Delgadas, Departamento de Física. Facultad de Ciencias. Pontificia Universidad Javeriana, Bogotá, D.C., Pedroza-Rodríguez, Aura Marina; Grupo de Biotecnología Ambiental e Industrial (GBAI), Departamento de Microbiología, Facultad de Ciencias. Pontificia Universidad Javeriana, Bogotá, D.C. |
| Formato: | info:eu-repo/semantics/article |
| Idioma: | eng |
| Publicado: |
Pontificia Universidad Javeriana
2010
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| Materias: | |
| Acceso en línea: |
http://revistas.javeriana.edu.co/index.php/scientarium/article/view/1371 |
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| Sumario: |
Objective: Fabrication and optical characterization of close-packed 225 nm SiO2 -based colloidal crystals. Materials and methods: The vertical convective self-assembly method is used to grow high-quality 225 nm close-packed SiO2-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). Results: 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) SiO2 based colloidal crystals are obtained. Conclusions: The growth of high-quality (long range order and defect-free) face centered cubic opal-based photonic crystals is reported. Key words: Photonic crystals, colloidal crystals, artificial opals, vertical convective deposition method, Bragg diffraction |
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