Ara es mostren els items 7-26 de 32

    • 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 ...
    • Multicolor soliton culsters 

      Kartashov, Yaroslav V.; Molina Terriza, Gabriel; Torner Sabata, Lluís (2002-11)
      Article
      Accés restringit per política de l'editorial
      We present a comprehensive theoretical investigation of the formation and propagation of multicolor ringlike soliton clusters in quadratic nonlinear materials under conditions for type I second-harmonic generation. We show ...
    • Multidimensional quantum states of the orbital angular momentum of light 

      Vaziri, A; Weihs, G.; Mair, A; Zeilinger, A; Molina Terriza, Gabriel; Pérez Torres, Juan; Torner Sabata, Lluís (2002-12)
      Article
      Accés restringit per política de l'editorial
    • 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 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 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
    • Optical vortex streets 

      Molina Terriza, Gabriel; Petrov, D V; Torner Sabata, Lluís (2002-12)
      Article
      Accés restringit per política de l'editorial
    • Orbital angular momentum of photons in noncollinear parametric downconversion 

      Molina Terriza, Gabriel; Pérez Torres, Juan; Torner Sabata, Lluís (2003-11)
      Article
      Accés restringit per política de l'editorial
      Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along ...
    • Preparation of engineered two-photon entangled states for multidimensional quantum information 

      Pérez Torres, Juan; Deyanova, Y; Torner Sabata, Lluís; Molina Terriza, Gabriel (2003-05)
      Article
      Accés restringit per política de l'editorial
      We put forward an experimentally feasible technique to generate engineered entangled states in d-dimensional Hilbert spaces in parametric down-conversion of photons. The scheme is based on the orbital angular momentum of ...
    • Probing canonical geometrical objects by digital spiral imaging 

      Molina Terriza, Gabriel; Rebane, L; Pérez Torres, Juan; Torner Sabata, Lluís; Carrasco, S (2007-05)
      Article
      Accés restringit per política de l'editorial
      We recently proposed a novel concept to remotely acquire information of objects, based on the discrete orbital angular momentum of light. Here we use two different schemes for implementing the technique. In order to test ...
    • 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 ...
    • Simultaneous frequency conversion and beam shaping for optical-tweezers applications 

      Molina Terriza, Gabriel; Torner Sabata, Lluís; Minardi, S; Trapani, P Di (2003-07)
      Article
      Accés restringit per política de l'editorial
      We review a method which allows the simultaneous frequency-conversion and shaping of a light beam into a variety of patterns. The method is based on the controllable dynamics of vortices nested in the light beams. We outline ...
    • 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 ...
    • Superposition of non-coaxial vortices in parametric wave mixing 

      Sukhorukov, A P; Kalinovich, A A; Molina Terriza, Gabriel; Torner Sabata, Lluís (2002-09)
      Article
      Accés restringit per política de l'editorial
      In this paper we present a comprehensive study of the dynamics of screw phase dislocations under conditions of noncoaxial parametric three-wave mixing in the pump low-depletion regime. Under such conditions the signal and ...
    • 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 ...
    • 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 ...