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Article Dans Une Revue physica status solidi (a) Année : 2009

Photonic properties and applications of glass micro- and nanospheres

Résumé

Fabrication, morphological and spectroscopic assessment of micro- and nano-spheres are reported. Spheres with size ranging from few hundreds of nm to few hundreds of μm have been prepared by different methods, i.e. sol–gel, melting and core-shell techniques. Pure and rare-earth-doped spheres find their major applications as micro-sensors and micro-lasers, respectively. We refer here to Erbium-activated systems only: (i) coated micro spheres where the silica core, obtained by telecom fibre melting, is coated with an Er3+–70SiO2–30HfO2 film; (ii) Er3+-activated micro-spheres obtained from silicate modified glasses and phosphate glasses using a plasma-torch; (iii) sol–gel Er3+-doped silica micro- and nano-spheres. The whispering gallery mode spectra were analysed as a function of sphere diameter, thickness of coating (if any) and Erbium content. Photoluminescence spectra of different systems gave interesting indications on the potential of some activated micro-spheres for lasing applications. For instance, sol–gel Er3+-activated core-shell-like structures exhibited a lifetime of 12.8 ms, leading to a quantum efficiency (QE) of 71%. Even higher QE (~76%) was estimated in sol–gel Er3+- silica spheres.

Dates et versions

hal-00474725 , version 1 (20-04-2010)

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Giancarlo C. Righini, Franco Cosi, Gualtiero Nunzi Conti, Stefano Pelli, S. Soria, et al.. Photonic properties and applications of glass micro- and nanospheres. physica status solidi (a), 2009, 206 (5), pp.898-903. ⟨10.1002/pssa.200881335⟩. ⟨hal-00474725⟩
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