Low dielectric properties of alkali-free aluminoborosilicate fiber glasses for PCB applications at 10 GHz.

Alkali-free aluminoborosilicate glasses without (GDMC-Si) and with LaO addition (GDMC-La) were fabricated with an aim to develop low dielectric glass fibers for use in printed circuit boards (PCBs) as a reinforcing material in high-speed 5G/6G telecommunications application. This study presents the structural, thermo-physical, and dielectric properties of the glasses. The decrease in glass transition temperature (T) and the increase in coefficient of thermal expansion (CTE) were found by the addition of SiO and LaO in the present glass system, which are due to the depolymerization of the glass networks confirmed by the FTIR analysis.

Analysis of the Dielectric Properties of Alkali-Free Aluminoborosilicate Glasses by Considering the Contributions of Electronic and Ionic Polarizabilities in the GHz Frequency Range.

Recently, the investigation of the dielectric properties of glasses in the GHz frequency range has attracted great interest for use in printed circuit boards (PCBs) as a reinforcing material in the application of high-speed 5G/6G communications. In particular, glasses with low dielectric properties are a prerequisite for high-frequency applications. In this study, the GHz dielectric properties of alkali-free aluminoborosilicate glasses without and with LaO were analyzed using the Clausius-Mossotti equation where both the electronic and ionic polarizabilities contribute to the dielectric constant.

Enhancement of Luminescence Efficiency of YO Nanophosphor via Core/Shell Structure.

We successfully fabricated YO:RE (RE = Eu, Tb, and Dy) core and core-shell nanophosphors by the molten salt method and sol-gel processes with YO core size of the order of 100~150 nm. The structural and morphological studies of the RE-doped YO nanophosphors are analyzed by using XRD, SEM and TEM techniques, respectively. The concentration and annealing temperature dependent structural and luminescence characteristics were studied for YO:RE core and core-shell nanophosphors.

Engineering of TeO-ZnO-BaO-Based Glasses for Mid-Infrared Transmitting Optics.

In this paper, the glass systems, TeO-ZnO-BaO (TZB), TeO-ZnO-BaO-NbO (TZB-Nb) and TeO-ZnO-BaO-MoO (TZB-Mo), were fabricated by the traditional melt-quench protocol for use as mid-infrared (mid-IR) transmitting optical material. The effect of NbO and MoO on the key glass material properties was studied through various techniques. From the Raman analysis, it was found that the structural modification was clear with the addition of both NbO and MoO in the TZB system.

Temperature and Vibration Dependence of the Faraday Effect of Gd₂O₃ NPs-Doped Alumino-Silicate Glass Optical Fiber.

All-optical fiber magnetic field sensor based on the Gd₂O₃ nano-particles (NPs)-doped alumino-silicate glass optical fiber was developed, and its temperature and vibration dependence on the Faraday Effect were investigated. Uniformly embedded Gd₂O₃ NPs were identified to form in the core of the fiber, and the measured absorption peaks of the fiber appearing at 377 nm, 443 nm, and 551 nm were attributed to the Gd₂O₃ NPs incorporated in the fiber core. The Faraday rotation angle (FRA) of the linearly polarized light was measured at 650 nm with the induced magnetic field by the solenoid.

UV Photoluminescence of Alumino-Germano-Silicate Glass Optical Fiber Incorporated with Gd₂O₃ Nano-Particles Upon Illumination of Xenon-Lamp.

Alumino-germano-silicate glass optical fiber incorporated with Gd2O3 nano-particles (NPs) was developed by using the modified chemical vapor deposition and the drawing process. The formation of spherical Gd2O3 NPs in the fiber core with average diameter of 10.8 nm was confirmed by the TEM.

Infrared-to-Visible Light Conversion in Er(3+) -Yb(3+) :Lu3 Ga5 O12 Nanogarnets.

Er(3+) -Yb(3+) co-doped Lu3 Ga5 O12 nanogarnets were prepared and characterized; their structural and luminescence properties were determined as a function of the Yb(3+) concentration. The morphology of the nanogarnets was studied by HRTEM. Under 488 nm excitation, the nanogarnets emit green, red, and near-infrared light.