Effects of Direct femtosecond laser writing on chloroborosilicate glasses doped with Eu3+/Eu2+ and CdS quantum dots

  • Femtosecond (fs) direct laser writing (DLW) is a promising technique for developing nano-inhomogeneous materials with advanced optical properties and for fabricating novel photonic devices such as integrated waveguides, ultrafast optical switches, phase plates, and 3D optical memory. In this study, DLW was applied to chloroborosilicate glasses that were singly and co-doped with Eu and CdS quantum dots (QDs). The glasses were laser-treated within a very narrow range of experimental conditions, resulting in laser-inscribed sites exhibiting enhanced emission, similar to the glass-ceramics crystallized from the as-prepared glass. In the regions crystalized by DLW a significant reduction of Eu3+ to Eu2+ was verified by photoluminescence spectroscopy. However, the characteristics of the emission bands of Eu2+ changed markedly in the laser-treated sites as compared to the emission spectra of the same glass crystallized by heat treatment. A considerable redshift and splitting of the emissionFemtosecond (fs) direct laser writing (DLW) is a promising technique for developing nano-inhomogeneous materials with advanced optical properties and for fabricating novel photonic devices such as integrated waveguides, ultrafast optical switches, phase plates, and 3D optical memory. In this study, DLW was applied to chloroborosilicate glasses that were singly and co-doped with Eu and CdS quantum dots (QDs). The glasses were laser-treated within a very narrow range of experimental conditions, resulting in laser-inscribed sites exhibiting enhanced emission, similar to the glass-ceramics crystallized from the as-prepared glass. In the regions crystalized by DLW a significant reduction of Eu3+ to Eu2+ was verified by photoluminescence spectroscopy. However, the characteristics of the emission bands of Eu2+ changed markedly in the laser-treated sites as compared to the emission spectra of the same glass crystallized by heat treatment. A considerable redshift and splitting of the emission band were observed, attributed to changes in the surrounding environment of the rare earth (RE) ions which was, in turn, attributed to an alteration in the coordination number of Ba2 + and/or Eu2+ as a result of the high-power laser treatment. Although there was an issue with homogeneity of the glass in the micro-level, which restricts some of the aspects of the DLW, these findings suggest the potential for structural modifications through laser treatment, which could be harnessed to create new functionalities for advanced optical applications.zeige mehrzeige weniger

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Autor*innen:Nilanjana ShasmalORCiD
Koautor*innen:Veronique Jubera, Yannick Petit, Gilles Philippot, Andrea Simone Stucchi de CamargoORCiD, Ana Candida Martins RodriguesORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.6 Glas
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:CdS quantum dots; DLW; Eu/CdS co-doped glass; Femtosecond direct laser writing
Themenfelder/Aktivitätsfelder der BAM:Material
Material / Advanced Materials
Veranstaltung:ICG 2025 (27th International Congress on Glass)
Veranstaltungsort:Kolkata, India
Beginndatum der Veranstaltung:20.01.2025
Enddatum der Veranstaltung:24.01.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:05.01.2026
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Ja
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