Πλοήγηση ανά Συγγραφέας "Dragosli, Foteini"

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    Phosphate glass microsphere resonators with silver nanoparticles by means of simple post-glass melting thermal treatment
    (ΕΛΜΕΠΑ, Σχολή Μηχανικών (ΣΜΗΧ), ΔΠΜΣ Νανοτεχνολογία για Ενεργειακές Εφαρμογές, 2025-07-14) Dragosli, Foteini; Δραγοσλή, Φωτεινή; Stratakis, Emmanouil; Στρατάκης, Εμμανουήλ
    The utilization of glass microspheres in whispering gallery mode (WGM) microresonator platforms has attracted a lot of interest in the field of photonics over the years. Nevertheless, the synthesis of glass spheres in the micro regime continues to be a challenge and primarily depends on sol-gel chemistry or complicated synthetic techniques. In response to the disadvantages of these fabrication methods, including the small amount of microspheres produced, the expensive maintenance required, the complexity, the safety risks, the high costs, and the environmental toxicity, among others, it was necessary to develop a new, efficient, and cost-effective technique for producing the microspheres. Therefore, we present here a simple, fast, lowtemperature, post-glass melting thermal treatment of previously quenched glass for the controlled formation of phosphate glass microspheres. The type of glass we are employing for this purpose is the meta phosphate glass. Scanning electron microscopy (SEM) study of the glass microspheres demonstrated that both the shape and size of the microspheres can be controlled with this technique. Additionally, the optical absorbance and Transmission Electron Microscopy (TEM) analysis verified the existence of silver nanoparticles and microclusters on the microspheres' surfaces. The Raman Spectroscopy analysis confirmed that the silver nanoparticles exhibit optical property features without modifying the phosphate glass network. There are numerous optoelectronic, photonic, and sensing applications that are considered to benefit from these attractive optical and plasmon properties. For this reason, we examined into a polymer-based waveguide application which utilizes this microshpere technology.