Now showing items 1-20 of 22

  • Bose-Einstein condensates with localized spin-orbit coupling: Soliton complexes and spinor dynamics 

    Kartashov, Yaroslav; Konotop, Vladimir V; Zezyulin, Dmitry A (2014-12-15)
    Article
    Open Access
    Spin-orbit (SO) coupling can be introduced in a Bose-Einstein condensate (BEC) as a gauge potential acting only in a localized spatial domain. The effect of such a SO “defect” can be understood by transforming the system to ...
  • Bright solitons from defocusing nonlinearities 

    Borovkova, Olga V.; Kartashov, Yaroslav; Torner Sabata, Lluís; Malomed, Boris A. (2011-09-19)
    Article
    Restricted access - publisher's policy
    We report that defocusing cubic media with spatially inhomogeneous nonlinearity, whose strength increases rapidly enough toward the periphery, can support stable bright localized modes. Such nonlinearity landscapes give ...
  • General quasi-nonspreading linear three-dimensional wave packets 

    Borovkova, Olga V.; Kartashov, Yaroslav; Lobanov, Valery E.; Vysloukh, Victor A.; Torner Sabata, Lluís (2011-06-15)
    Article
    Restricted access - publisher's policy
    We introduce a general approach for generation of sets of three-dimensional quasi-nonspreading wave packets propagating in linear media, also referred to as linear light bullets. The spectrum of rigorously nonspreading ...
  • Light bullets by synthetic diffraction-dispersion matching 

    Lobanov, Valery E.; Kartashov, Yaroslav; Torner Sabata, Lluís (2010-07-03)
    Article
    Open Access
    We put forward a new approach to generate stable, fully three-dimensional light bullets, which is based on the matching of the intrinsic material dispersion with a suitable effective diffraction. The matching is achieved ...
  • Light dynamics in glass-vanadium dioxide nanocomposite waveguides with thermal nonlinearity 

    Kartashov, Yaroslav; Vysloukh, Victor A. (2009-04)
    Article
    Open Access
    We address the propagation of laser beams in SiO2–VO2 nanocomposite waveguides with thermo-optical nonlinearity. We show that the large modifications of the absorption coefficient as well as notable changes of the ...
  • Light localization in nonuniformly randomized lattices 

    Kartashov, Yaroslav; Konotop, Vladimir V; Vysloukh, Victor A.; Torner Sabata, Lluís (2012)
    Article
    Restricted access - publisher's policy
    We address Anderson localization of light in disordered optical lattices where the disorder strength varies across the transverse direction. Such variation changes the preferred domains where formation of localized eigenmodes ...
  • Method to generate complex quasinondiffracting optical lattices 

    López Aguayo, Servando; Konotop, Vladimir V; Kartashov, Yaroslav; Torner Sabata, Lluís (2010-07-02)
    Article
    Open Access
    We put forward a powerful technique that allows generating quasi-non-diffracting light beams with a variety of complex transverse shapes and topologies. We show that, e.g., spi-raling patterns, patterns featuring curved ...
  • Negative Goos-Hanchen shift in periodic media 

    Rechtsman, Mikael C.; Kartashov, Yaroslav; Setzpfandt, Frank; Trompeter, Henrik; Torner Sabata, Lluís; Pertsch, T.; Peschel, Ulf; Szameit, A. (2011-11-15)
    Article
    Restricted access - publisher's policy
    We show that, under certain conditions, a negative Goos–Hänchen shift—a longitudinal displacement of a totally internally reflected wave packet—occurs in periodic media such as waveguide arrays.
  • Nonlinearity-mediated soliton ejection from trapping potentials in nonlocal media 

    Fangwei, Ye; Kartashov, Yaroslav; Hu, Bambi; Torner Sabata, Lluís (2010-08-30)
    Article
    Open Access
    We address the properties of optical solitons in thermal nonlinear media with a local refractive index defect that is capable to trap solitons launched even close to the sample boundary despite the boundary-mediated ...
  • Observation of the gradual transition from one-dimensional to two-dimensional Anderson localization 

    Naether, U.; Kartashov, Yaroslav; Vysloukh, Victor A.; Nolte, S.; Tünnermann, A.; Torner Sabata, Lluís; Szameit, A. (2012-02-15)
    Article
    Restricted access - publisher's policy
    We study the gradual transition from one-dimensional to two-dimensional Anderson localization upon transformation of the di-mensionality of disordered waveguide arrays. An effective transition from one- to two-dimensional ...
  • Resonant Bloch-wave beatings 

    Kartashov, Yaroslav; Vysloukh, Victor A.; Torner Sabata, Lluís (2014-07-01)
    Article
    Restricted access - publisher's policy
    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
    Open Access
    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 ...
  • Rotating vortex solitons supported by localized gain 

    Borovkova, Olga V.; Lobanov, Valery E.; Kartashov, Yaroslav; Torner Sabata, Lluís (2011-05-15)
    Article
    Restricted access - publisher's policy
    We show that ringlike localized gain landscapes imprinted in focusing cubic (Kerr) nonlinear media with strong two-photon absorption support new types of stable higher-order vortex solitons containing multiple phase ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • Soliton gyroscopes in media with spatially growing repulsive nonlinearity 

    Driben, Rodislav; Kartashov, Yaroslav; Malomed, Boris A.; Meier, Torsten; Torner Sabata, Lluís (2014-01-15)
    Article
    Open Access
    We find that the recently introduced model of self-trapping supported by a spatially growing strength of a repulsive nonlinearity gives rise to robust vortex-soliton tori, i.e., three-dimensional vortex solitons, with ...
  • Solitons in geometric potentials 

    Kartashov, Yaroslav; Szameit, A.; Keil, R.; Vysloukh, Victor A.; Torner Sabata, Lluís (2011-07-01)
    Article
    Restricted access - publisher's policy
    We show that the geometrically induced potential existing in undulated slab waveguides dramatically affects the properties of solitons. In particular, whereas solitons residing in the potential maxima do not feature power ...
  • Solitons supported by spatially inhomogeneous nonlinear losses 

    Borovkova, Olga V.; Kartashov, Yaroslav; Vysloukh, Victor A.; Lobanov, Valery E.; Malomed, Boris A.; Torner Sabata, Lluís (2012)
    Article
    Restricted access - publisher's policy
    We uncover that, in contrast to the common belief, stable dissipative solitons exist in media with uniform gain in the presence of nonuniform cubic losses, whose local strength grows with coordinate η (in one dimension) ...
  • Stable vortex-soliton tori with multiple nested phase singularities in dissipative media 

    Borovkova, Olga V.; Lobanov, Valery E.; Kartashov, Yaroslav; Torner Sabata, Lluís (2012)
    Article
    Restricted access - publisher's policy
    We show the existence of stable two- and three-dimensional vortex solitons carrying multiple, spatially separated, single-charge topological dislocations nested in a common vortex-ring core. Such nonlinear states are ...
  • Stripe-like quasi-nondiffracting optical lattices 

    Kartashov, Yaroslav; López Aguayo, Servando; Vysloukh, Victor A.; Torner Sabata, Lluís (2011-05-09)
    Article
    Restricted access - publisher's policy
    We introduce stripe-like quasi-nondiffracting lattices that can be generated via spatial spectrum engineering. The complexity of the spatial shapes of such lattices and the distance of their almost diffractionless propagation ...
  • Three-dimensional hybrid vortex solitons 

    Driben, Rodislav; Kartashov, Yaroslav; Malomed, Boris A.; Meier, Torsten; Torner Sabata, Lluís (2014-06-16)
    Article
    Open Access
    We show, by means of numerical and analytical methods, that media with a repulsive nonlinearity which grows from the center to the periphery support a remarkable variety of previously unknown complex stationary and dynamical ...