Abstract
Extreme synthesis conditions can lead to discover materials and phenomena that are unknown under standard synthesis laboratory conditions. The particularities of the optical fiber fabrication, such as extreme temperatures, quenching heat treatments and the pressure generated during fiber drawing, among others, can be leveraged to explore novel phenomena at the nanoscale when optical fibers are engineered by nanoparticle doping. In this work, we demonstrate that starting from tetragonal cubic-shaped YPO4 nanocrystals contained into a silica-based optical fiber core, with a silica-based glass composition slightly modified with Ge P, and Al, it is possible to nucleate isolated spherical-shaped SiO nanocrystals by controlling fiber drawing temperature. This work demonstrates the existence of crystalline SiO, discussing the possible formation mechanism in detail, which addes new knowledge to silicon oxide family. Moreover, we show the suitability of using SiO nanocrystals for fabricating Rayleigh scattering enhanced optical fibers that can be applied for distributed sensing applications.
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