Super Broadband at Telecom Wavelengths From RE-Doped SiO-TaO Glass Ceramics Planar Waveguides.

This paper reports on the preparation of Er/Yb/Tm, Er/Yb/Nd, and Er/Tm/Nd triply doped and Er-doped SiO-TaO glass ceramic nanocomposites and active planar waveguides by the sol-gel process using the dip-coating technique as deposition method. The investigation of their structural, morphological, and luminescent properties using XRD, AFM, and photoluminescence analysis, are reported here. The XRD results showed the presence of L-TaO nanocrystals dispersed in the SiO-based amorphous host for all the nanocomposites and films.

Photoluminescence properties of Er and Er/Yb doped tellurite glass and glass-ceramics containing BiTeO crystals.

Glass and glass-ceramics containing nanocrystals of BiTeO cubic phase co-doped with Er and Yb were prepared by heat treatment of the precursor tellurite glass and investigated for optical applications. Lanthanide doped tellurite glass and glass-ceramics have been extensively investigated because of their optical and photoluminescence performance for technological photonic applications. Er and Er/Yb doped TeO-GeO-KO-BiO tellurite glass compositions were prepared by the conventional melt-quenching method.

Single Er, Yb: KGdF Nanoparticles for Nanothermometry.

Among several optical non-contact thermometry methods, luminescence thermometry is the most versatile approach. Lanthanide-based luminescence nanothermometers may exploit not only downshifting, but also upconversion (UC) mechanisms. UC-based nanothermometers are interesting for biological applications: they efficiently convert near-infrared radiation to visible light, allowing local temperatures to be determined through spectroscopic investigation.

Optical Line Width Broadening Mechanisms at the 10 kHz Level in Eu:YO Nanoparticles.

We identify the physical mechanisms responsible for the optical homogeneous broadening in Eu:YO nanoparticles to determine whether rare-earth crystals can be miniaturized to volumes less than λ while preserving their appeal for quantum technology hardware. By studying how the homogeneous line width depends on temperature, applied magnetic field, and measurement time scale, the dominant broadening interactions for various temperature ranges above 3 K were characterized. Below 3 K the homogeneous line width is dominated by an interaction not observed in bulk crystal studies.