25 September 1998 Photosensitivity of sol-gel-derived nanocomposites in optical device deposition: an in-situ spectroscopic study
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Proceedings Volume 3417, Photopolymer Device Physics, Chemistry, and Applications IV; (1998) https://doi.org/10.1117/12.323498
Event: Lasers and Materials in Industry and Opto-Contact Workshop, 1998, Quebec, Canada
Abstract
An in situ waveguide Raman spectroscopy experiment was designed to monitor structural changes that occurred when a hybrid sol gel glass thin film was irradiated with UV light. Raman scatter was collected from an Ar+ laser 514.5 TE0 mode excited in the waveguide. Insight into the photoinduced changes in the glass was obtained by collecting real time WR spectra as the slab waveguide was irradiated simultaneously with UV light. Photoinduced polymerization of the organic group is linked to enhanced inorganic network formation. Silicon centers are brought closer together as their covalently attached methacrylate substituents oligomerize upon irradiation. This promotes further polycondensation reactions between residual Si-OH and residual Si-OCH3 groups. The resulting siloxane bonds contribute to the growth of the silicate matrix. This photodensification process leads to volume compaction of the matrix and hence to an increase in the material refractive index.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kalaichelvi Saravanamuttu, Kalaichelvi Saravanamuttu, Mark P. Andrews, Mark P. Andrews, S. Iraj Najafi, S. Iraj Najafi, } "Photosensitivity of sol-gel-derived nanocomposites in optical device deposition: an in-situ spectroscopic study", Proc. SPIE 3417, Photopolymer Device Physics, Chemistry, and Applications IV, (25 September 1998); doi: 10.1117/12.323498; https://doi.org/10.1117/12.323498
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