Exploració per autor "Kartashov, Yaroslav"
Ara es mostren els items 6-25 de 28
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Light bullets by synthetic diffraction-dispersion matching
Lobanov, Valery E.; Kartashov, Yaroslav; Torner Sabata, Lluís (2010-07-03)
Article
Accés obertWe 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
Accés obertWe 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
Accés restringit per política de l'editorialWe 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
Accés obertWe 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
Accés restringit per política de l'editorialWe 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
Accés obertWe 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
Accés restringit per política de l'editorialWe 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 ... -
Observation of two-dimensional superlattice solitons
Heinrich, Matthias; Kartashov, Yaroslav; Ramírez, L. P. R.; Szameit, Alexander; Dreisow, Felix; Keil, R; Nolte, Stefan; Tünnermann, Andreas; Vysloukh, Victor A.; Torner Sabata, Lluís (2009-12)
Article
Accés restringit per política de l'editorialWe observe experimentally two-dimensional solitons in superlattices comprising alternating deep and shallow waveguides fabricated via the femtosecond-laser direct writing technique. We find that the symmetry of linear ... -
Resonant Bloch-wave beatings
Kartashov, Yaroslav; Vysloukh, Victor A.; Torner Sabata, Lluís (2014-07-01)
Article
Accés restringit per política de l'editorialWe 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 obertWe 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
Accés restringit per política de l'editorialWe 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
Accés restringit per política de l'editorialWe 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
Accés obertWe 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
Accés restringit per política de l'editorialWe 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
Accés restringit per política de l'editorialWe 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) ... -
Stabilization of multibeam necklace solitons in circular arrays with spatially modulated nonlinearity
Kartashov, Yaroslav; Malomed, B A; Vysloukh, Victor A.; Torner Sabata, Lluís (2009-11)
Article
Accés restringit per política de l'editorialWe consider necklace solitons supported by circular waveguide arrays with out-of-phase modulation of nonlinearity and linear refractive index. Such two-dimensional necklace solitons appear as rings of multiple out-of-phase ... -
Stabilization of two-dimensional solitons in cubic-saturable nonlinear lattices
Borovkova, Olga V.; Kartashov, Yaroslav; Torner Sabata, Lluís (2010-06-04)
Article
Accés restringit per política de l'editorialWe consider soliton dynamics and stability in a nonlinear lattice formed by alternating domains with focusing cubic and saturable nonlinearities. We find that in such lattices, solitons centered on cubic domains may be ... -
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
Accés restringit per política de l'editorialWe 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
Accés restringit per política de l'editorialWe 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
Accés obertWe 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 ...