Abstract
We report the fluorescent properties of 3D localized structure with size near the diffraction limit induced by femtosecond direct laser writing (DLW) in Yb 3+ and silver-containing phosphate glass. The homogenous dispersion of the silver ions and Yb 3+ ions in the glass matrix before DLW was evidenced using photo-luminescent spectroscopy and time-resolved spectroscopy. Using high repetition rate femtosecond DLW, the inscription of 3D visible and near-infrared fluorescent patterns formed by co-localization of silver cluster and Yb 3+ ions was demonstrated. The local refractive index change associated with the formation of silver clusters is dependent on the laser irradiance. Confocal micro-luminescent spectroscopy for excitation wavelength in the visible range shows efficient emission of Yb 3+ only on DLW induced 3D fluorescent patterns. This finding demonstrated the ability to perform thanks to DLW laser a resonant efficient nonradiative energy transfer from silver clusters to Yb 3+ and allows 3D writing of near-infrared luminescence. • Femtosecond Direct Laser Writing (DLW) allowing for tunable luminescence properties from the Visible to the Near Infra-Red range. • Laser-induced 3D multiscale photonic architectures in the Near Infra-Red range. • Highly-localized efficient resonant energy transfer from laser-inscribed silver clusters to randomly-distributed Ytterbium ions. • Highly-localized background-free near-IR emission under indirect excitation fully mediated by silver cluster excitation. • Adapted photosensitive glass compositions for DLW and photonic applications.
Published Version
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