Now showing items 41-60 of 126

    • Helico-conical optical beams self-heal 

      Hermosa, N.; Rosales Guzmán, C.; Pérez Torres, Juan (2013-01)
      Article
      Open Access
      An optical beam is said to be self-healing when, distorted by an obstacle, the beam corrects itself upon propagation. In this Letter we show, through experiments supported by numerical simulations, that Helico-conical ...
    • High spatial entanglement via chirped quasi-phase-matched optical parametric down-conversion 

      Svozilik, Jiri; Perina, Jr., Jan; Pérez Torres, Juan (2012-11)
      Article
      Open Access
      By making use of the spatial shape of paired photons, parametric down-conversion allows the generation of two-photon entanglement in a multidimensional Hilbert space. How much entanglement can be generated in this way? In ...
    • Highly efficient noise-assisted energy transport in classical oscillator systems 

      Leon Montiel, R de J.; Pérez Torres, Juan (2013-05)
      Article
      Open Access
      Photosynthesis is a biological process that involves the highly-efficient transport of energy captured from the sun to a reaction center, where conversion into useful biochemical energy takes place. Even though one can ...
    • Hong-Ou-Mandel interferometry on a biphoton beat note 

      Chen, Yuanyuan; Fink, Matthias; Steinlechner, Fabian; Pérez Torres, Juan; Ursin, Rupert (2019-05-24)
      Article
      Open Access
      Hong-Ou-Mandel interference, the fact that identical photons that arrive simultaneously on different input ports of a beam splitter bunch into a common output port, can be used to measure optical delays between different ...
    • How to automate a kinematic mount using a 3D printed arduino-based system 

      Salazar Serrano, Luis Jose; Jiménez Machado, Gerard; Pérez Torres, Juan (2018-06-01)
      Article
      Open Access
      We demonstrate a simple, flexible and cost-effective system to automatize most of the kinematic mounts available nowadays on the market. It combines 3D-printed components, an Arduino board, stepper motors and simple ...
    • Hybrid waves guided by ultrathin films 

      Torner Sabata, Lluís; Pérez Torres, Juan; Ojeda, C.; Mihalache, Dumitru (1995-09)
      Article
      Open Access
      Abstract: The existence conditions and waveguiding properties of new hybrid, TE-dominant waveguide modes of properly tailored waveguides consisting on ultrathin films cladded by a positive birefringent crystal are analyzed. ...
    • Hyperentangled photon sources in semiconductor waveguides 

      Kang, D.; Helt, L. G.; Zhukovsky, Sergei V.; Pérez Torres, Juan; Sipe, J. E.; Helmy, A.S. (2014-02-19)
      Article
      Open Access
      We propose and analyze the performance of a technique to generate mode and polarization hyperentangled photons in monolithic semiconductor waveguides using two concurrent type-II spontaneous parametric down-conversion ...
    • 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
      Restricted access - publisher's policy
      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 ...
    • Implementation of a spatial two-dimensional quantum random walk with tunable decoherence 

      Svozilik, Jiri; León Montiel, R.D.J.; Pérez Torres, Juan (2012-11)
      Article
      Open Access
      We put forward a versatile and highly scalable experimental setup for the realization of discrete two-dimensional quantum random walks with a single-qubit coin and tunable degree of decoherence. The proposed scheme makes ...
    • Impurity solitons with quadratic nonlinearities 

      Clausen, C B; Pérez Torres, Juan; Torner Sabata, Lluís (1998-12)
      Article
      Restricted access - publisher's policy
      We find families of solitary waves mediated by parametric mixing in quadratic nonlinear media that are localized at point-defect impurities. Solitons localized at attractive impurities are found to be dynamically stable. ...
    • Knotting fractional-order knots with the polarization state of light 

      Pisanty, Emilio; Machado, Gerard J.; Vicuña-Hernández, Verónica; Picón, Antonio; Celi, Alessio; Pérez Torres, Juan; Lewenstein, Maciej (Nature, 2019-06-10)
      Article
      Open Access
      The fundamental polarization singularities of monochromatic light are normally associated with invariance under coordinated rotations: symmetry operations that rotate the spatial dependence of an electromagnetic field by ...
    • Knotting fractional-order knots with the polarization state of light 

      Pisanty, Emilio; Jiménez Machado, Gerard; Vicuña Hernández, Verónica; Picón, Antonio; Celi, Alessio; Pérez Torres, Juan; Lewenstein, Maciej (2019-08-01)
      Article
      Open Access
      The fundamental polarization singularities of monochromatic light are normally associated with invariance under coordinated rotations: symmetry operations that rotate the spatial dependence of an electromagnetic field by ...
    • La fotònica revoluciona les telecomunicacions 

      Torner Sabata, Lluís; Pérez Torres, Juan; Artigas García, David; Santos Blanco, M. Concepción (1998-12)
      Article
      Open Access
    • Limitations to the determination of a Laguerre–Gauss spectrum via projective, phase-flattening measurement 

      Qassim, Hammam; Miatto, Filippo M.; Pérez Torres, Juan; Padgett, Miles J.; Karimi, Ebrahim; Boyd, Robert W. (2014-04-07)
      Article
      Open Access
      One of the most widely used techniques for measuring the orbital angular momentum (OAM) components of a light beam is to flatten the spiral phase front of a mode, in order to couple it to a single-mode optical fiber (SMOF). ...
    • 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
      Restricted access - publisher's policy
      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, ...
    • Measurement of sub-pulse-width temporal delays via spectral interference induced by weak value amplification 

      Salazar Serrano, L.J.; Janner, Davide; Brunner, Nicolas; Pruneri, Valerio; Pérez Torres, Juan (2014-01-27)
      Article
      Open Access
      We demonstrate experimentally a scheme to measure small temporal delays, much smaller than the pulse width, between optical pulses. Specifically, we observe an interference effect, based on the concepts of quantum weak ...
    • Measurement of the temperature of atomic ensembles via which-way information 

      León Montiel, R.D.J.; Pérez Torres, Juan (2012-03-05)
      Article
      Restricted access - publisher's policy
      We unveil the relationship existing between the temperature of an ensemble of three-level atoms in a configuration, and the width of the emission cone of Stokes photons that are spontaneously emitted when atoms are ...
    • Measurement-based tailoring of Anderson localization of partially coherent light 

      Svozilik, Jiri; Perina, Jan; Pérez Torres, Juan (2014-05-08)
      Article
      Open Access
      We put forward an experimental configuration to observe transverse Anderson localization of partially coherent light beams with a tunable degree of first-order coherence. The scheme makes use of entangled photons propagating ...
    • Measuring the translational and rotational velocities of particles in helical motion using structured light 

      Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan (2014-06-30)
      Article
      Open Access
      We measure the rotational and translational velocity components of particles moving in helical motion under a Laguerre-Gaussian mode illumination. The moving particle reflects light that acquires an additional frequency ...
    • Method for generating solitons sustained by competing nonlinearities by use of optical rectification 

      Pérez Torres, Juan; Palacios, S L; Torner Sabata, Lluís; Crasovan, L C; Mihalache, Dumitru; Biaggio, I (2002-09)
      Article
      Restricted access - publisher's policy
      We put forward a method for generating engineerable competing quadratic and cubic nonlinearities in suitable settings in which frequency generation is accompanied by optical rectification. The novel scheme is based on the ...