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  1. Article

    Open Access

    The generally covariant meaning of space distances

    We propose a covariant and geometric framework to introduce space distances as they are used by astronomers. In particular, we extend the definition of space distances from the one used between events to non-t...

    S. Capozziello, A. Chiappini, L. Fatibene… in The European Physical Journal Plus (2020)

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  2. No Access

    Article

    Study of graphitic microstructure formation in diamond bulk by pulsed Bessel beam laser writing

    The advantages of using Bessel beams for the generation of graphitic structures in diamond bulk are presented. We show that by irradiating the sample with a pulsed Bessel beam whose non-diffracting zone is of ...

    S. Kumar, B. Sotillo, A. Chiappini, R. Ramponi, P. Di Trapani… in Applied Physics A (2017)

  3. Article

    Open Access

    Sol–gel-derived photonic structures handling erbium ions luminescence

    The sol–gel technique is a very flexible, relatively simple, and low-cost method to fabricate many different innovative photonic structures characterized by specific functionalities. During synthesis, starting...

    A. Lukowiak, A. Chiappini, A. Chiasera, D. Ristic… in Optical and Quantum Electronics (2015)

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  4. No Access

    Article

    Whispering gallery mode profiles in a coated microsphere

    The properties of whispering gallery modes (WGM) of a microsphere can be tailored by coating the resonator with a thin film. If the coating has a higher refractive index than the microsphere core, the resultin...

    D. Ristić, A. Chiappini, M. Mazzola… in The European Physical Journal Special Topi… (2014)

  5. No Access

    Article

    Synthesis and characterization of PMMA-based superhydrophobic surfaces

    Recently, superhydrophobic surfaces are gaining much interest because they may be employed in a series of applications, spanning from the realization of self-cleaning surfaces to microfluidics to special water...

    I. Bernagozzi, S. Torrengo, L. Minati, M. Ferrari… in Colloid and Polymer Science (2012)

  6. 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)

  7. 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)

  8. No Access

    Chapter and Conference Paper

    Formal Specification and Development of a Safety-Critical Train Management System

    In this paper we describe the on-going specification and development of Ansald’s Radio Block Center (RBC), a component of the next-generation European Rail Traffic Management System (ERTMS). The RBC will be re...

    A. Chiappini, A. Cimatti, C. Porzia… in Computer Safety, Reliability and Security (1999)