Proceedings PaperNumerical model of Ag+ - Na+ field-assisted ion-exchange for strip waveguide fabrication in masked glass
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The assumptions of Ag+-Na+ ion-exchange numerical model for strip waveguide formation process in silicate glass were presented. Ag+ ions diffused from molten AgNO3 salt into the glass substrate through the opening in a dielectric or metallic mask previously deposited on the glass surface. The diffusion was speeded up by the external electric field applied during ion-exchange process. As an effect of the mask presence on the glass surface, side diffusion occurred - the range of Ag diffusion in the direction under the mask was comparable to the diffusion range in the direction perpendicular to the glass surface. A space charge formation in the glass layer adjacent to the mask was assumed in the numerical model simulation. Its essential role in side diffusion range was analyzed and the results of the numerical calculations were compared to the experimental data.