Ara es mostren els items 1-20 de 376

  • A game of billiards with spatial solitary waves in ktp 

    Torruellas, W; Torner Sabata, Lluís (1996-03)
    Article
    Accés restringit per política de l'editorial
  • A simple method to generate optical beams with a screw phase dislocation 

    Petrov, D V; Canal Bienzobas, Fernando; Torner Sabata, Lluís (1997-09)
    Article
    Accés restringit per política de l'editorial
    In this work, it is shown experimentally that optical beams that contain a phase dislocation can be generated with a laser oscillating in the fundamental mode and a cylindrical-lens mode converter.
  • Adiabatic shaping of quadratic solitons 

    Torner Sabata, Lluís; Clausen, C B; Fejer, M M (1998-06)
    Article
    Accés restringit per política de l'editorial
    We show the principle of operation of a setup to adiabatically shape solitons in quadratic nonlinear media to different beam profiles and widths or different fractions of energy carried by the second-harmonic wave. The ...
  • Algebraic bright and vortex solitons in defocusing media 

    Borovkova, Olga V.; Kartashov, Yaroslav V.; Malomed, Boris A.; Torner Sabata, Lluís (2011-08-15)
    Article
    Accés restringit per política de l'editorial
    We demonstrate that spatially inhomogeneous defocusing nonlinear landscapes with the nonlinearity coefficient growing toward the periphery as (1+|¿|¿) support one- and two-dimensional fundamental and higher-order bright ...
  • Amplification of quadratic solitons 

    Torner Sabata, Lluís (1998-08)
    Article
    Accés restringit per política de l'editorial
    Amplification of spatial solitons in quadratic nonlinear media under conditions for second-harmonic generation is addressed. Under the action of gain at a given frequency band the energy has to be redistributed ...
  • Anderson cross-localization 

    Stützer, Simon; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Tünnermann, A.; Nolte, Stefan; Lewenstein, Maciej; Torner Sabata, Lluís; Szameit, Alexander (2012)
    Article
    Accés restringit per política de l'editorial
    We report Anderson localization in two-dimensional optical waveguide arrays with disorder in waveguide separation introduced along one axis of the array, in an uncorrelated fashion for each waveguide row. We show that the ...
  • Anderson localization in Bragg-guiding arrays with negative defects 

    Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2012-10)
    Article
    Accés restringit per política de l'editorial
    We show that Anderson localization is possible in waveguide arrays with periodically spaced defect waveguides having a lower refractive index. Such localization is mediated by Bragg reflection, and it takes place even if ...
  • Anderson localization of light with topological dislocations 

    Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2013-11-01)
    Article
    Accés obert
    We predict Anderson localization of light with nested screw topological dislocations propagating in disordered two-dimensional arrays of hollow waveguides illuminated by vortex beams. The phenomenon manifests itself in the ...
  • Angular surface slitons in sectorial hexagonal arrays 

    Szameit, Alexander; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Heinrich, Matthias; Dreisow, Felix; Pertsch, T; Nolte, Stefan; Tünnermann, A; Lederer, F; Torner Sabata, Lluís (2008-07)
    Article
    Accés restringit per política de l'editorial
    We report on the experimental observation of corner surface solitons localized at the edges joining planar interfaces of hexagonal waveguide array with uniform nonlinear medium. The face angle between these interfaces has ...
  • Anisotropy-induced photonic bound states in the continuum 

    Gomis Bresco, Jordi; Artigas García, David; Torner Sabata, Lluís (Nature, 2017-03-20)
    Article
    Accés obert
    Bound states in the continuum (BICs) are radiationless localized states embedded in the part of the parameter space that otherwise corresponds to radiative modes. Many decades after their original prediction1, 2, 3 and ...
  • Aplicación del método variacional al análisis de sistemas de guías no paralelas 

    Recolons Martos, Jaume; Torner Sabata, Lluís (1989)
    Text en actes de congrés
    Accés obert
  • Applicability of the.Lorentzian peak method to analyze leaky and lossy optical waveguides 

    Torner Sabata, Lluís; Canal Bienzobas, Fernando (1991-06)
    Article
    Accés obert
    Several conclusions concerning the applicability of the Lorentzian peak method to compute the complex propagation constant of leaky and lossy waveguide modes are established.
  • Arresting wave collapse by wave self-rectification 

    Crasovan, L C; Pérez Torres, Juan; Mihalache, Dumitru; Torner Sabata, Lluís (2003-08)
    Article
    Accés restringit per política de l'editorial
    We put forward a mechanism for tailoring, and even arresting, the collapse of wave packets in nonlinear media, whose dynamics is governed by nonlocal two-dimensional nonlinear Schrödinger-like equations. The key ingredient ...
  • Asymmetric matter-wave solitons at nonlinear interfaces 

    Ye, F; Kartashov, Yaroslav V.; Torner Sabata, Lluís (2006-12)
    Article
    Accés restringit per política de l'editorial
    We predict the existence and study the basic properties of strongly asymmetric matter wave solitons that form at the interface produced by regions with different interatomic interaction strengths in pancake Bose-Einstein ...
  • Asymmetric soliton mobility in competing linear-nonlinear parity-time-symmetric lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2016-09-15)
    Article
    Accés restringit per política de l'editorial
    We address the transverse mobility of spatial solitons in competing parity-time-symmetric linear and nonlinear lattices. The competition between out-of-phase linear and nonlinear lattices results in a drastic mobility ...
  • Asymmetric solitons and domain walls supported by inhomogeneous defocusing nonlinearity 

    Kartashov, Yaroslav V.; Lobanov, Valery E.; Malomed, Boris A.; Torner Sabata, Lluís (2013-12-01)
    Article
    Accés restringit per política de l'editorial
    We show that an inhomogeneous defocusing nonlinearity that grows toward the periphery in the positive and negative transverse directions at different rates can support strongly asymmetric fundamental and multipole bright ...
  • Asymmetric spatio-temporal optical solitons in media with quadratic nonlinearity 

    Mihalache, Dumitru; Mazilu, D; Malomed, B A; Torner Sabata, Lluís (1998-07)
    Article
    Accés restringit per política de l'editorial
    We find exact one-parameter families of stationary two-dimensional light bullets in the form of solitons localized in space and time in diffractive and dispersive nonlinear media under conditions for second-harmonic ...
  • Asymmetrical splitting of higher-order optical solitons induced by quintic nonlinearity 

    Artigas García, David; Torner Sabata, Lluís; Pérez Torres, Juan; Akhmediev, Juan P Torres I Nail N (1997-11)
    Article
    Accés restringit per política de l'editorial
    We address the effect of quintic nonlinearities in the propagation of optical solitons in cubic nonlinear media. Our focus is on the decay of higher-order solitons in the presence of self-defocusing quintic perturbations. ...
  • Azimuthal instabilities and self-breaking of beams into sets of solitons in bulk second-harmonic generation 

    Torner Sabata, Lluís; Petrov, D V (Institution of Electrical Engineers, 1997-03)
    Article
    Accés obert
    Optical harmonic generation
  • Bandwidth-enhanced quadratic soliton formation by on-sample single-band amplification 

    Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís (2000-09)
    Article
    Accés restringit per política de l'editorial
    Formation of optical solitons in quadratic nonlinear media under conditions for second-harmonic generation is investigated numerically in the presence of linear amplification at the fundamental frequency band. We show that ...