Ara es mostren els items 1-20 de 21

  • Characterization of dielectric spheres by spiral imaging 

    Petrov, Dimitri; Rahuel, Nicolás; Molina Terriza, Gabriel; Torner Sabata, Lluís (2012)
    Article
    Accés obert
    We study the spiral spectra scattered off transparent dielectric spheres when probed by different Laguerre–Gaussian light beams, carrying nested topological wavefront dislocations. We show that such scattering data may ...
  • Controllable patterns of parametric solitons 

    Minardi, S; Molina Terriza, Gabriel; Bramati, A; Ditrapani, P; Torner Sabata, Lluís; Pérez Torres, Juan; Petrov, D V; Soto-Crespo, J M (2001-12)
    Article
    Accés restringit per política de l'editorial
  • Demonstration of vortex-induced beam shaping in seeded SHG 

    Molina Terriza, Gabriel; Minardi, Stefano; Bramati, Alberto; Di Trapani, Paolo; Torner Sabata, Lluís (2001-07)
    Article
    Accés restringit per política de l'editorial
    We report the experimental demonstration of a method that allows the simultaneous frequency-doubling and the shaping of a light beam into a variety of patterns. The technique is based on the controllable generation of ...
  • Foto noticia 

    Molina Terriza, Gabriel; Toner, L; Torner Sabata, Lluís (2000-05)
    Article
    Accés obert
  • Impact of imbalancing in the self-splitting of beams with nested vortices into solitons in quadratic nonlinear crystals 

    Molina Terriza, Gabriel; Pérez Torres, Juan; Torner Sabata, Lluís; Soto-Crespo, J M (1998-12)
    Article
    Accés restringit per política de l'editorial
    We address the existence and instability of bright vortex solitary waves in quadratic non-linear media under conditions for Type II second-harmonic generation and study in detail the effects introduced by the presence of ...
  • Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum 

    Molina Terriza, Gabriel; Pérez Torres, Juan; Torner Sabata, Lluís (2002-01)
    Article
    Accés restringit per política de l'editorial
    We put forward schemes to prepare photons in multidimensional vector states of orbital angular momentum. We show realizable light distributions that yield prescribed states with finite or infinite normal modes. In particular, ...
  • Multicharged vortex evolution in seeded second-harmonic generation 

    Molina Terriza, Gabriel; Torner Sabata, Lluís (2000-07)
    Article
    Accés restringit per política de l'editorial
    We show the dynamics of the evolution of screw phase dislocations in the wave fronts of Gaussian beams with nested multiple-charged vortices that propagate in quadratic nonlinear crystals under conditions for seeded ...
  • Observation of optical vortex streets in walking-second harmonic generation 

    Molina Terriza, Gabriel; Dmitri, V Petrov; Recolons Martos, Jaume; Torner Sabata, Lluís (2002-04-15)
    Article
    Accés restringit per política de l'editorial
    We report what is believed to be the first experimental observation of spontaneous nucleation of arrays of optical vortices in the process of second-harmonic generation in a crystal with moderate Poynting vector walk-off, ...
  • Observation of optical vortex streets in walking-second harmonic generation 

    Molina Terriza, Gabriel; Petrov, Dimitri; Recolons Martos, Jaume; Torner Sabata, Lluís (OPTICAL SOC AMER - (OSA), 2002-04-30)
    Article
    Accés obert
  • Observation of the dynamical inversion of the topological charge of an optical vortex 

    Molina Terriza, Gabriel; Recolons Martos, Jaume; Pérez Torres, Juan; Torner Sabata, Lluís; Wright, Ewan M. (AMERICAN PHYSICAL SOC, 2001-07-31)
    Article
    Accés obert
  • Propagation and control of noncanonical optical vortices 

    Molina Terriza, Gabriel; Wright, E W; Torner Sabata, Lluís (2001-02)
    Article
    Accés restringit per política de l'editorial
    We predict new features for the evolution of noncanonical screw wave-front dislocations nested in diffracting light beams. The evolution equations for the location of single-charge dislocations are derived, and their ...
  • Properties of the spatial Wigner function of entangled photon pairs 

    González, Noelia; Molina Terriza, Gabriel; Pérez Torres, Juan (2009-10)
    Article
    Accés obert
    In this paper we analyze some important characteristics of the spatial Wigner function of entangled photon pairs. We show that the Wigner description of quantum states that live in the infinite-dimensional spacemomentum degree ...
  • Reconfigurable dynamic beam shaping in seeded frequency-doubling 

    Molina Terriza, Gabriel; Torner Sabata, Lluís (2001-02)
    Article
    Accés restringit per política de l'editorial
    A new method that allows simultaneous frequency doubling and dynamic shaping of a Gaussian beam into a variety of light patterns is introduced. The novel technique is based on the controllable generation of multiple-vortex ...
  • Soliton algebra by vortex beam splitting 

    Minardi, Stefano; Molina Terriza, Gabriel; Di Trapani, Paolo; Pérez Torres, Juan; Torner Sabata, Lluís (2001-07)
    Article
    Accés restringit per política de l'editorial
    We experimentally demonstrate the possibility of breaking up intense vortex light beams into stable and controllable sets of parametric solitons. We report observations performed in seeded second-harmonic generation, but ...
  • Structural instability of vortices in Bose-Einstein-Condensates 

    Garcia Ripoll, Juan José; Molina Terriza, Gabriel; Perez García, Victor M.; Torner Sabata, Lluís (2001-09)
    Article
    Accés restringit per política de l'editorial
    In this paper we study a gaseous Bose-Einstein condensate and show the following: (i) A minimum value of the interaction is needed for the existence of stable persistent currents. (ii) Vorticity is not a fundamental invariant ...
  • The curious arithmetic of optical vortices 

    Molina Terriza, Gabriel; Recolons Martos, Jaume; Torner Sabata, Lluís (Optical Society of America, 2000-08-15)
    Article
    Accés obert
    The superposition of noncoaxial light beams containing screw wave-front dislocations is shown to create light patterns with a richer vortex content than that given by the arithmetic of the topological charges of the ...
  • The curious arithmetic of optical vortices 

    Molina Terriza, Gabriel; Recolons Martos, Jaume; Torner Sabata, Lluís (2000-08-15)
    Article
    Accés restringit per política de l'editorial
    The superposition of noncoaxial light beams containing screw wave-front dislocations is shown to create light patterns with a richer vortex content than that given by the arithmetic of the topological charges of the ...
  • Vortex evolution in parametric wave mixing 

    Petrov, D V; Molina Terriza, Gabriel; Torner Sabata, Lluís (1999-04)
    Article
    Accés obert
    We investigate the evolution of vortex wave front dislocations in multiple-wave second-harmonic generation processes in quadratic nonlinear media. Vortices nested in finite-size host beams are shown to nucleate and to ...
  • Vortex nucleation and evolution in parametric wave mixing 

    Molina Terriza, Gabriel; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Text en actes de congrés
    Accés obert
    We predict a variety of new phenomena, that includes the spontaneous nucleation of multiple vortex twins, vortex rotation and drift, vortex-antivortex interaction and annihilation, and formation of quasi-aligned patterns ...
  • Vortex revivals with trapped light 

    Molina Terriza, Gabriel; Torner Sabata, Lluís; Wright, E M; Garcia Ripoll, Juan José; Perez García, Victor M. (2001-10)
    Article
    Accés restringit per política de l'editorial
    We predict that vortex dipoles nested in light beams trapped in graded-index media can undergo closed Berry trajectories, yielding periodic vortex annihilations and revivals along the light-propagation direction. The vortex ...