Ara es mostren els items 50-69 de 104

  • Parametric amplification of random lattice soliton swinging 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2009-05)
    Article
    Accés restringit per política de l'editorial
    We consider the propagation of solitons in media with an imprinted transverse periodic or parabolic refractive index modulation when the modulation depth fluctuates slightly along the propagation direction. We find that, ...
  • Parametric amplification of soliton steering in optical lattices 

    Kartashov, Yaroslav V.; Torner Sabata, Lluís; Vysloukh, Victor A. (2004-05)
    Article
    Accés restringit per política de l'editorial
    We report on the effect of parametric amplification of spatial soliton swinging in Kerr-type nonlinear media with longitudinal and transverse periodic modulation of the linear refractive index. The parameter areas are found ...
  • Power-dependent shaping of vortex solitons in optical lattices with spatially modulated nonlinearrefractive index 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-10)
    Article
    Accés restringit per política de l'editorial
    We address vortex solitons supported by optical lattices featuring modulation of both the linear and nonlinear refractive indices. We find that when the modulation is out of phase the competition between both effects results ...
  • Propagation of solitons in thermal media with periodic nonlinearity 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-08)
    Article
    Accés restringit per política de l'editorial
    We address the existence and properties of solitons in layered thermal media made of alternating focusing and defocusing layers. Such structures support robust bright solitons even if the averaged nonlinearity is defocusing. ...
  • Reconfigurable directional couplers and junctions optically induced by nondiffracting Bessel beams 

    Xu, Zhiyong; Kartashov, Yaroslav V.; Torner Sabata, Lluís; Vysloukh, Victor A. (2005-05)
    Article
    Accés restringit per política de l'editorial
    We put forward the concept of reconfigurable structures optically induced by mutually incoherent nondiffracting Bessel beams in Kerr-type nonlinear media. We address collinear couplers and X junctions and show how one can ...
  • Resonant Bloch-wave beatings 

    Kartashov, Yaroslav; Vysloukh, Victor A.; Torner Sabata, Lluís (2014-07-01)
    Article
    Accés restringit per política de l'editorial
    We introduce Bloch-wave beatings in arrays of multimode periodically bent waveguides with a transverse refractive index gradient. The new phenomenon manifests itself in the periodic drastic increase of the amplitude of the ...
  • Resonant mode conversion in the waveguides with unbroken and broken PT symmetry 

    Vysloukh, Victor A.; Kartashov, Yaroslav (2014-10-15)
    Article
    Accés obert
    We study resonant mode conversion in parity time (PT)-symmetric multimode waveguides, where symmetry breaking manifests itself in the sequential destabilization (i.e., the appearance of complex eigenvalues) of the pairs ...
  • Resonant mode oscillations in modulated waveguiding structures 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2007-12)
    Article
    Accés restringit per política de l'editorial
    We put forward the concept of resonant, Rabi-like oscillatons and adiabatic transitions between confined light modes in properly modulated multimode waveguides. The phenomenon is shown to take place in both the linear and ...
  • Ring surface waves in thermal nonlinear media 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2007-11)
    Article
    Accés restringit per política de l'editorial
    We address ring-shaped surface waves supported by defocusing thermal media with circular cross-section. Such waves exist because of the balance between repulsion from the interface and deflection of light from the bulk ...
  • Rotary dipole-mode solitons in Bessel optical lattices 

    Kartashov, Yaroslav V.; Egorov, A A; Vysloukh, Victor A.; Torner Sabata, Lluís (2004-09)
    Article
    Accés restringit per política de l'editorial
    We address Bessel optical lattices of radial symmetry imprinted in cubic Kerr-type nonlinear media and show that they support families of stable dipole-mode solitons featuring two out-of-phase light spots located in different ...
  • Rotary solitons in Bessel optical lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2004-08)
    Article
    Accés restringit per política de l'editorial
    We introduce solitons supported by Bessel photonic lattices in cubic nonlinear media. We show that the cylindrical geometry of the lattice, with several concentric rings, affords unique soliton properties and dynamics. In ...
  • Rotating surface solitons 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2007-10)
    Article
    Accés restringit per política de l'editorial
    We introduce a novel type of surface waves that form at the edge of guiding structures consisting of several concentric rings. Such surface waves rotate steadily upon propagation and, in contrast with nonrotating waves, ...
  • Rotating vortex clusters in media with inhomogeneous defocusing nonlinearity 

    Kartashov, Yaroslav V.; Malomed, Boris A.; Vysloukh, Victor A.; Belic, Milivoj R.; Torner Sabata, Lluís (2017-02-01)
    Article
    Accés restringit per política de l'editorial
    We show that media with inhomogeneous defocusing cubic nonlinearity growing toward the periphery can support a variety of stable vortex clusters nested in a common localized envelope. Nonrotating symmetric clusters are ...
  • Self-trapping and splitting of bright vector solitons under inhomogeneous defocusing nonlinearities 

    Kartashov, Yaroslav; Vysloukh, Victor A.; Torner Sabata, Lluís; Malomed, Boris A. (2011-12-01)
    Article
    Accés restringit per política de l'editorial
    We show that bimodal systems with a spatially nonuniform defocusing cubic nonlinearity, whose strength grows toward the periphery, can support stable two-component solitons. For a sufficiently strong cross-phase-modulation ...
  • Shaping solitons properties in Mathieu lattices 

    Kartashov, Yaroslav V.; Egorov, A A; Vysloukh, Victor A.; Torner Sabata, Lluís (2006-01)
    Article
    Accés restringit per política de l'editorial
    We address basic properties and stability of two-dimensional solitons in photonic lattices induced by the nondiffracting Mathieu beams. Such lattices allow for smooth topological transformation of radially symmetric Bessel ...
  • Soliton control in chirped photonic lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2005-07)
    Article
    Accés restringit per política de l'editorial
    We study optical solitons in chirped periodic optical lattices whose amplitude or frequency changes in the transverse direction. We discover that soliton propagation in such lattices can be accompanied by the progressive ...
  • Soliton control in fading optical lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2006-06)
    Article
    Accés restringit per política de l'editorial
    We predict new phenomena, such as soliton steering and soliton fission, in optical lattices that fade away exponentially along the propagation direction. Such lattices, featuring tunable decay rates, arise in photorefractive ...
  • Soliton emission in amplifying optical lattice surfaces 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2007-07)
    Article
    Accés restringit per política de l'editorial
    We address surface solitons supported by the interface of optical lattices imprinted in saturable media with surface-localized gain. The nonlinearity saturation puts restrictions on the maximal energy flow carried by surface ...
  • Soliton excitation in waveguide arrays with an effective intermediate dimensionality 

    Szameit, Alexander; Kartashov, Yaroslav V.; Dreisow, Felix; Heinrich, Matthias; Pertsch, T; Nolte, Stefan; Tunnermann, A F Lederer; Vysloukh, Victor A.; Lederer, F.; Torner Sabata, Lluís (2009-01)
    Article
    Accés restringit per política de l'editorial
    We reveal and observe experimentally significant modifications undertaken by discrete solitons in waveguide lattices upon the continuous transformation of the lattice structure from one-dimensional to two-dimensional. Light ...
  • Soliton generation by counteracting gain-guiding and self-bending 

    Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2012-11-01)
    Article
    Accés restringit per política de l'editorial
    We introduce a concept for stable spatial soliton formation, mediated by the competition between self-bending induced by a strongly asymmetric nonlocal nonlinearity and spatially localized gain superimposed on a wide ...