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SOL-GEL PROCESSING OF BATIO3 FOR ELECTRO-OPTIC WAVEGUIDE DEVICES
Bowman, D | Bhandarkar, S
Ceramic Transactions. Vol. 163, pp. 85-98. 2005
The effects of processing parameters on the optical properties of
barium titanate thin films were studied. Barium titanate is a good
candidate for electro-optic devices such as a Mach-Zehnder
waveguide modulator due to its high electro-optic coefficient.
Thin films prepared by sol-gel deposition were optically
characterized using a prism coupler. The sol was prepared with a
large polymeric additive in an attempt to attain thicker sintered
films. The waveguide loss of the film was shown to increase
sharply at the onset of organic bum-off of this additive. It is
postulated that an optically active `microstructure' results from
this burn-off that causes high loss due to light scattering. This
domain-based structure also appears to template the growth of
nanosized grains during the final sintering of the film.
 Descriptors: Electro-optics | Optical waveguides | Barium titanate | Thin films | Sol-gel processes | Sintering | Modulators | Prisms | Morphology | Nanostructure | Light scattering
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