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OwnerNorberto Chiodini, Alberto Paleari +1inventors
InventorsNorberto Chiodini, Alberto Paleari, Giorgio Spinolo
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A glass ceramic material with a base of silica and tin dioxide: the material has a vitreous silica matrix, in which there are dispersed crystalline aggregates of tin dioxide having submicrometric or nanometric dimensions, the dimensions being obtained by means of appropriate control of specific operating parameters of the process of preparation. The material has excellent values of optical transmission in the visible and in the near infrared and high properties of photosensitivity and optical non-linearity, which render the material suitable, in particular, for use in devices for optical telecommunications (integrated in optical fibre or on planar waveguide or in three-dimensional devices) and memories, the devices being obtainable, for example, by direct writing or using laser interferometric techniques.
A glass ceramic material with a base of silica and tin dioxide, particularly for optical applications, comprising a matrix of vitreous silica in which there are dispersed crystalline aggregates of tin dioxide, the material being characterized in that said aggregates have controlled dimensions that are on average lower than a pre-set threshold and such that the material is photosensitive and substantially transparent.
A process for making a glass ceramic material having a matrix of vitreous silica in which are dispersed crystalline aggregates of tin dioxide of controlled dimensions, said process comprising a step of sol-gel reaction of respective precursors of silica and tin, and a step of sintering the gel resulting from said sol-gel reaction, said process being characterized in that the dimensions of said aggregates of tin dioxide are controlled by varying the concentration of tin in said step of sol-gel reaction, and/or the partial pressure of oxygen in said sintering step, and/or the maximum temperature reached in said sintering step.
The glass ceramic material with a base of silica and tin dioxide, particularly for optical applications, and the process of fabrication of said material, and devices made with said material, substantially as described herein.
Dependencies are inferred from the claim text.