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Synthesis of amorphous silicon/magnesia based direct opals with tunable optical properties |
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| Authors: | Luca PallavidinoMarco Liscidini Alessandro VirgaAngelica Chiodoni Emiliano DescroviJoaquin Cos Lucio Claudio AndreaniCandido Fabrizio Pirri Francesco Geobaldo Fabrizio Giorgis |
| Affiliation: | a Materials Science and Chemical Engineering Department, Politecnico of Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy b Physics Department “A. Volta” and UdR CNISM, University of Pavia, Via Bassi 6, I-27100 Pavia, Italy c Physics Department, Politecnico of Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy d Center for Space Human Robotics at the Politecnico di Torino (CSHR@POLITO), Italian Institute of Technology, Corso Trento 21 - 10129 Torino, Italy e Department of Electronics, Electrical and Automation, University Rovira i Virgili, Avda. Països Catalans 26, 43007 Tarragona, Spain |
| Abstract: | The effective refractive index of silica based artificial opals can be strongly modulated through magnesiothermic and wet etching processes. The magnesiothermic reduction of silica spheres assembled in a fcc lattice produces amorphous silicon/magnesia matrix, which can be easily converted in oxidized porous silicon, preserving the ordered structure. These results are verified by electron microscopies and IR/Raman spectroscopies. The optical properties are analyzed in terms of the experimental reflectance spectra. By comparing the measured data to rigorous calculations, the good quality of the opaline replicas is demonstrated. |
| Keywords: | Opals Photonic crystals Optical spectroscopies |
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