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Proceedings Paper

Photosensitivity of sol-gel-derived nanocomposites in optical device deposition: an in-situ spectroscopic study
Author(s): Kalaichelvi Saravanamuttu; Mark P. Andrews; S. Iraj Najafi
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Paper 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.

Paper Details

Date Published: 25 September 1998
PDF: 6 pages
Proc. SPIE 3417, Photopolymer Device Physics, Chemistry, and Applications IV, (25 September 1998); doi: 10.1117/12.323498
Show Author Affiliations
Kalaichelvi Saravanamuttu, McGill Univ. (Canada)
Mark P. Andrews, McGill Univ. (Canada)
S. Iraj Najafi, Ecole Polytechnique de Montreal (Canada)

Published in SPIE Proceedings Vol. 3417:
Photopolymer Device Physics, Chemistry, and Applications IV
Roger A. Lessard, Editor(s)

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