Raman spectra and structure of multicomponent oxide planar waveguides prepared by sol-gel |
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Authors: | Ana C Marques Rui M Almeida |
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Institution: | (1) Departamento de Engenharia de Materiais/ICEMS, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal |
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Abstract: | This work was aimed at understanding the structure of SiO2–MO2 (M = Ti, Zr, Hf) and SiO2–HfO2–MO2 (M = Ti, Zr) materials, used as mixed oxide glass hosts for Er3+ ions in the fabrication of optical planar waveguides by sol-gel processing. This structural study was performed by Waveguide
Raman Spectroscopy (WRS), complemented with X-ray diffraction (XRD). The admixture of TiO2 to HfO2, SiO2–HfO2 and HfO2–ZrO2 compositions was found to cause precipitation of nanocrystals of tetragonal HfO2 or ZrO2, or the formation of hafnia-titania mixed crystals, depending on the HfO2/TiO2 molar ratio. |
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Keywords: | Sol-gel Planar waveguides Waveguide Raman spectroscopy X-ray diffraction Silica-titania Silica-hafnia Hafnia-titania nanocrystals |
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