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  1. No Access

    Article

    Er3+-activated silica inverse opals synthesized by the solgel method

    We present the details of the sol-gel processing used to realize inverse silica opal, where the silica was activated with 0.3 mol% of Er3+ ions. The template (direct opal) was obtained assembling polystyrene sphe...

    A. Chiappini, C. Armellini, A. Chiasera, Y. Jestin, M. Ferrari… in Optoelectronics Letters (2007)

  2. No Access

    Article

    Diagnostic techniques for photonic materials based on Raman and Brillouin spectroscopies

    The elastic and vibrational properties of a material, bulk or planar waveguide, are studied by Brillouin and Raman spectroscopy to follow the process of nanocrystals growth in glass-ceramics. The nanoparticles...

    M. Mattarelli, S. Caponi, A. Chiappini, M. Montagna, E. Moser… in Optoelectronics Letters (2007)

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    Article

    Effect of Yb3+ concentration on Er3+ luminescence properties of sol-gelderived silica-alumina xerogels

    Er3+ / Yb3+ co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm. The Yb/Si content was varied from 0 to 4 000 ppm Densification of the samp...

    K. Tran Ngoc, H. Pham Thanh, C. Nguyen Duc, C. Armellini… in Optoelectronics Letters (2006)