Ara es mostren els items 1-20 de 106

  • 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 ...
  • 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 ...
  • Bloch-wave packet control in truncated modulated optical lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2010-12-15)
    Article
    Accés restringit per política de l'editorial
    We study the reflection of Bloch wave packets at the interface of an optical lattice possessing a shallow longitudinal out-of-phase refractive index modulation in the adjacent waveguides. We show that the relation between ...
  • Bragg guiding of domainlike nonlinear modes and kink arrays in lower-index core structures 

    Ye, F; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-06)
    Article
    Accés restringit per política de l'editorial
    We introduce a novel class of stable nonlinear modes trapped in a lower-index film core sandwiched between two optical lattices, or in the cylindrical core of a radial lattice, imprinted in defocusing media. Such a family ...
  • Bragg-type soliton mirror 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2006-02)
    Article
    Accés restringit per política de l'editorial
    We study soliton reflection/transmission at the interface between uniform medium and the optical lattice with focusing Kerr nonlinearity. We reveal that such interfaces afford rich new opportunities for controlling the ...
  • Brownian soliton motion 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-05)
    Article
    Accés restringit per política de l'editorial
    We reveal fundamental analogies between soliton dynamics in light-induced random photonic lattices and Brownian motion of particles. In particular, we discover that the average squared soliton displacement increases linearly ...
  • Cnoidal wave patterns in quadratic nonlinear media 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2003-07)
    Article
    Accés restringit per política de l'editorial
    We report the existence of whole families of stationary cnoidal, periodic wave patterns in quadratic nonlinear media. We study the main physical features of the multicolored light patterns, including their shape, contrast, ...
  • Composite vortex-ring solitons in Bessel photonic lattices 

    Kartashov, Yaroslav V.; Torner Sabata, Lluís; Vysloukh, Victor A. (2005-07)
    Article
    Accés restringit per política de l'editorial
    We reveal the existence of dynamically stable, composite topological solitons in Bessel photonic lattices imprinted in focusing Kerr-type nonlinear media. The new stable, composite solitons are made of a vortex ring with ...
  • Diffraction control in P T -symmetric photonic lattices: from beam rectification to dynamic localization 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Konotop, Vladimir V; Torner Sabata, Lluís (2016-01-21)
    Article
    Accés obert
    We address the propagation of light beams in longitudinally modulated PT-symmetric lattices, built as arrays of couplers with periodically varying separation between their channels, and show a number of possibilities for ...
  • Diffraction managements of focused light beams in optical lattices with a quadratic frequency modulation 

    Kartashov, Yaroslav V.; Torner Sabata, Lluís; Vysloukh, Victor A. (2005-05)
    Article
    Accés restringit per política de l'editorial
    We reveal that the effective diffraction experienced by light beams launched along the central guiding channel of optical lattice with a quadratic frequency modulation can be tuned in strength and sign. Complete suppression ...
  • Disorder-induced soliton transmission in nonlinear photonic lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2011-02-15)
    Article
    Accés restringit per política de l'editorial
    We address soliton transmission and reflection in nonlinear photonic lattices embedded into uniform Kerr nonlinear media. We show that by introducing disorder into the guiding lattice channels, one may achieve soliton ...
  • Dispersion-managed cnoidal pulse trains 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Marti-Panameño, E.; Artigas García, David; Torner Sabata, Lluís (2003-08)
    Article
    Accés restringit per política de l'editorial
    We report on the existence and properties of breathing periodic cnoidal pulse trains propagating in dispersion managed systems with piecewise constant dispersion. Our numerical investigations show that the dispersion ...
  • Dissipative defect modes in periodic structures 

    Kartashov, Yaroslav; Konotop, Vladimir V; Vysloukh, Victor A.; Torner Sabata, Lluís (2010-05-15)
    Article
    Accés restringit per política de l'editorial
    We show that periodic optical lattices imprinted in cubic nonlinear media with strong two-photon absorption and localized linear gain landscapes support stable dissipative defect modes in both focusing and defocusing media. ...
  • Dynamic versus Anderson wave-packet localization 

    Borovkova, Olga V.; Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (APS Physics, 2015-06-18)
    Article
    Accés obert
    We address the interplay between two fundamentally different wavepacket localization mechanisms, namely resonant dynamic localization due to collapse of quasi-energy bands in periodic media and disorder-induced Anderson ...
  • Dynamic versus Anderson wave-packet localization 

    Borovkova, Olga V.; Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2015-06-18)
    Article
    Accés obert
    We address the interplay between two fundamentally different wave-packet localization mechanisms, namely, resonant dynamic localization due to collapse of quasienergy bands in periodic media and disorder-induced Anderson ...
  • Dynamics of surface solitons at the edge of chirped optical lattices 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2007-07)
    Article
    Accés restringit per política de l'editorial
    We address soliton formation at the edge of chirped optical lattices imprinted in Kerr-type nonlinear media. We find families of power thresholdless surface waves that do not exist at other types of lattice interfaces. ...
  • Eigenvalue control and switching by fission of multisoliton bound states in planar waveguides 

    Aleshkevich, V A; Kartashov, Yaroslav V.; Zelenina, A S; Vysloukh, Victor A.; Pérez Torres, Juan; Torner Sabata, Lluís (2004-03)
    Article
    Accés restringit per política de l'editorial
    We report the results of numerical studies of the fission of ¿-soliton bound states at the interface formed by a Kerr nonlinear medium and a linear dielectric in a planar waveguide. A variety of effects are shown to occur, ...