Phosphate glasses are attractive materials for the engineering of photonic devices, due to their easy processing, good thermal stability, excellent optical properties and high rare-earth ions solubility. Besides, phosphate glasses with a P2O5 content of 50 mol% have been shown to be suitable for fiber drawing .
In this presentation, we will first discuss how to develop new active glasses within the P2O5 – SrO – Na2O composition and how to draw them into fiber. The fabrication process, thermal, structural, and optical properties of the fiber will be presented and we will show that broad luminescence over 70 nm of bandwidth can be obtained from Er/Yb-codoped phosphate fiber. Finally, we will explain that it is possible to combine both biocompatibility and suitable optical properties in fibers. We will explain how to test the bioactivity and optical properties of the fiber in the prospect of developing an innovative biosensor. We will clearly show that the results pave the way towards the development of new bioactive fiber sensors for therapy monitoring. Indeed, such biophotonic fiber would allow one to monitor “in situ” the optical and biological response of an optical glass fiber in aqueous media. Such biodegradable or bioactive optical fiber could be resorbed or lead to new soft tissue once the sensing utility has been accomplished. In this way, the surgical removal of the fiber sensor is not needed.
LP acknowledges the Academy of Finland (Academy project-308558).
 C. Vitale-Brovarone, et al., Mater. Sci. Eng., C, 31, 434-442, 2011.
Laeticia C. Petit, "Fabrication and characterization of phosphate biophotonic fibers (Conference Presentation)," Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 110290I (Presented at SPIE Optics + Optoelectronics: April 04, 2019; Published: 14 May 2019); https://doi.org/10.1117/12.2522241.6035324086001.
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