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Development of faraday rotators based on oxide glasses and glass-ceramics containing perovskite nanocrystals for technological applications

Abstract

This project aims to synthesize and characterize oxide glasses and glass-ceramics with magneto-optical (MO) properties, aiming at the production of Faraday rotators for the development of MO sensors. To achieve this goal, borogermanate glasses containing high concentrations of rare earth ions with high paramagnetic moments (¼eff), such as Tb3+, Dy3+ and Ho3+, will be synthesized. The production of thermally stable glasses with high concentrations of rare earth ions, transparent in the visible and near-infrared (NIR) regions, and with high values of Verdet constant is not a trivial process. The fabrication of new Faraday rotators with high values of Verdet constant (VB) based on homogeneous and transparent MO glass-ceramics containing rare earth ion-derived A+3X3+O3 perovskite nanocrystals is a challenging task. The perovskites TbAlO3, DyAlO3, and HoAlO3 will be prepared from solid-state synthesis and subsequently inserted into the borogermanate glass matrix. Glasses and glass-ceramics will be prepared by the melt quenching method followed by thermal shock. Besides, it is intended to manufacture single-mode and/or multimode MO preforms and fibers. Thermal, structural, morphological, spectroscopic, and optical properties of glasses and glass ceramics will be studied via Differential Scanning Calorimetry (DSC), X-ray Diffraction, Transmission Electron Microscopy (TEM), and Raman, UV-Vis-NIR, M-Lines, and Luminescence spectroscopies, respectively. The investigation of the MO properties of vitreous materials will be performed by measuring the Faraday rotation angles (¸) and calculating the Verdet constants (VB) values in the visible and NIR (at 500, 632, 980, 1330, and 1550 nm) regions. MO fibers will be morphologically characterized via Scanning Electron Microscopy (SEM), and the optical signal attenuation measurements will be carried out using the Cut-back method. The magnitude of the MO effect of these materials will be evaluated based on the values of Verdet constant (VB). In terms of applications, materials with the highest VB values will be selected for the development of MO sensors aimed at detecting magnetic fields and electric currents in electrical transformers or electrical machines. (AU)

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