Synthesis of 3-glycidoxypropyltrimethoxysilane-TiO<sub>2</sub> UV-sensitive waveguides

S. Gardin; R. Bozio; G. Brusatin; G. Della Giustina; E. Giorgetti; M. Guglielmi; R. Signorini

doi:10.1117/12.663269

20 April 2006 Synthesis of 3-glycidoxypropyltrimethoxysilane-TiO₂ UV-sensitive waveguides

S. Gardin, R. Bozio, G. Brusatin, G. Della Giustina, E. Giorgetti, M. Guglielmi, R. Signorini

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 619232 (2006) https://doi.org/10.1117/12.663269
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

A hybrid organic-inorganic sol-gel material based on 3-(glycidoxypropyl)-trimethoxysilane (GPTMS), an organically modified alkoxide containing an epoxy ring in the organic functional group, and titanium isopropoxide Ti(OPrⁱ)₄ has been synthesised. The presence of Ti alkoxide is important in order to increase the refractive index and to improve the mechanical and physical properties of the film. A basic catalysis has been used to perform the hydrolysis/condensation reactions of the inorganic network and to preserve the presence of unreacted epoxy rings. The epoxy groups are thus available in the final solid state films for the UV-photopolymerization process. The photopolymerization allows one to increase the refractive index and to pattern the film directly. The modification of the hybrid sol-gel TiO₂ matrix microstructure during the thermal treatment and the interaction with the UV light have been investigated by FT-IR and UV-Vis spectroscopies, DTA and TGA thermal analysis. The sol-gel film thickness and roughness have been analyzed by a profilometer: the films possess high optical quality and well controlled thickness, ranging from 500 nm to 2 μm. The refractive index of sol-gel thin films was measured by m-line spectroscopy and ellipsometry. An increase of the refractive index in the range 0,02÷0,1 was achieved, depending on the UV irradiation dose.

Citation Download Citation

S. Gardin, R. Bozio, G. Brusatin, G. Della Giustina, E. Giorgetti, M. Guglielmi, and R. Signorini "Synthesis of 3-glycidoxypropyltrimethoxysilane-TiO₂ UV-sensitive waveguides", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619232 (20 April 2006); https://doi.org/10.1117/12.663269

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