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Dive into the research topics where Y. V. Kartashov is active.

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Featured researches published by Y. V. Kartashov.


Physical Review Letters | 2007

Observation of Two-Dimensional Surface Solitons in Asymmetric Waveguide Arrays

Alexander Szameit; Y. V. Kartashov; Felix Dreisow; Thomas Pertsch; Stefan Nolte; Andreas Tünnermann; Lluis Torner

We report on the experimental observation of two-dimensional surface waves localized at the edge or in the corner of femtosecond laser-written waveguide arrays in fused silica. Increasing the power of the input beam allows one to observe a clear transition from a linear diffraction pattern to localized nonlinear surface states, which can exist at the interface only above a certain power threshold. This constitutes the first ever experimental observation of two-dimensional nonlinear surface solitons in optics.


Physical Review Letters | 2009

Inhibition of light tunneling in waveguide arrays.

Alexander Szameit; Y. V. Kartashov; Felix Dreisow; Matthias Heinrich; Thomas Pertsch; Stefan Nolte; Andreas Tünnermann; Victor A. Vysloukh; Falk Lederer; Lluis Torner

We report the observation of almost perfect light tunneling inhibition at the edge and inside laser-written waveguide arrays due to band collapse. When the refractive index of the guiding channels is harmonically modulated along the propagation direction and out-of-phase in adjacent guides, light is trapped in the excited waveguide over a long distance due to resonances. The phenomenon can be used for tuning the localization threshold power.


Optics Letters | 2010

Wave localization at the boundary of disordered photonic lattices

Alexander Szameit; Y. V. Kartashov; Peter Zeil; Felix Dreisow; Matthias Heinrich; R. Keil; Stefan Nolte; Andreas Tünnermann; Victor A. Vysloukh; Lluis Torner

We report on the experimental observation of reduced light-energy transport and disorder-induced localization close to a boundary of a truncated 1D disordered photonic lattice. Our observations uncover that a higher level of disorder near the boundary is required to obtain similar localization than in the bulk.


Optics Letters | 2009

Light tunneling inhibition and anisotropic diffraction engineering in two-dimensional waveguide arrays

Y. V. Kartashov; Alexander Szameit; Victor A. Vysloukh; Lluis Torner

We address two-dimensional (2D) waveguide arrays where light tunneling into neighboring waveguides may be effectively suppressed by an out-of-phase harmonic modulation of the refractive index in neighboring waveguides at suitable frequencies. Genuine 2D features, such as anisotropic diffraction engineering, diffraction-free propagation along selected directions in the transverse plane, and tunneling inhibition for multichannel vortices, are shown to occur.


Optics Letters | 2009

Observation of two-dimensional defect surface solitons.

Alexander Szameit; Y. V. Kartashov; Matthias Heinrich; Felix Dreisow; Thomas Pertsch; Stefan Nolte; Andreas Tünnermann; Falk Lederer; Victor A. Vysloukh; Lluis Torner

We report on the experimental observation of two-dimensional solitons located in defect channels at the surface of a hexagonal waveguide array. The threshold power for the excitation of solitons existing owing to total internal reflection grows with decrease of the refractive index in negative defects and vanishes for sufficiently strong positive defects. Negative defects can also support linear surface modes existing owing to Bragg-type reflections.


Optics Letters | 2009

Nonlinearity-induced broadening of resonances in dynamically modulated couplers

Alexander Szameit; Y. V. Kartashov; Matthias Heinrich; Felix Dreisow; R. Keil; Stefan Nolte; Andreas Tünnermann; Victor A. Vysloukh; Falk Lederer; Lluis Torner

We report the observation of nonlinearity-induced broadening of resonances in dynamically modulated directional couplers. When the refractive index of the guiding channels in the coupler is harmonically modulated along the propagation direction and is out-of-phase in two channels, coupling can be completely inhibited at resonant modulation frequencies. We observe that nonlinearity broadens such resonances and that localization can be achieved even in detuned systems at power levels well below those required in unmodulated couplers.


Optics Letters | 2008

Surface solitons at interfaces of arrays with spatially modulated nonlinearity

Y. V. Kartashov; Victor A. Vysloukh; Alexander Szameit; Felix Dreisow; Matthias Heinrich; Stefan Nolte; Andreas Tünnermann; Thomas Pertsch; Lluis Torner

We address the properties of two-dimensional surface solitons supported by the interface of a waveguide array whose nonlinearity is periodically modulated. When the nonlinearity strength reaches its minima at the points where the linear refractive index attains its maxima, we found that nonlinear surface waves exist and can be made stable only within a limited band of input energy flows and for lattice depths exceeding a lower threshold.


Optics Letters | 2009

Observation of two-dimensional superlattice solitons

Matthias Heinrich; Y. V. Kartashov; Lourdes Patricia R. Ramirez; Alexander Szameit; Felix Dreisow; R. Keil; Stefan Nolte; Andreas Tünnermann; Victor A. Vysloukh; Lluis Torner

We 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 diffraction patterns as well as soliton shapes and threshold powers largely differ for excitations centered on deep and shallow sites. Thus, bulk and surface solitons centered on deep waveguides require much lower powers than their counterparts on shallow sites.


Physical Review A | 2005

Stable three-dimensional solitons in attractive Bose-Einstein condensates loaded in an optical lattice

Dumitru Mihalache; Dumitru Mazilu; Falk Lederer; Boris A. Malomed; Lucian-Cornel Crasovan; Y. V. Kartashov; Lluis Torner

The existence and stability of solitons in Bose-Einstein condensates with attractive interatomic interactions, described by the Gross-Pitaevskii equation with a three-dimensional (3D) periodic potential, are investigated in a systematic form. We find a one-parameter family of stable 3D solitons in a certain interval of values of their norm, provided that the strength of the potential exceeds a threshold value. The minimum number of 7Li atoms in the stable solitons is 60, and the energy of the soliton at the stability threshold is ˜6 recoil energies in the lattice. The respective energy versus norm diagram features two cuspidal points, resulting in a typical swallowtail pattern, which is a generic feature of 3D solitons supported by quasi-two-dimensional or fully dimensional lattice potentials.


Optics Letters | 2008

Angular surface solitons in sectorial hexagonal arrays

Alexander Szameit; Y. V. Kartashov; Victor A. Vysloukh; Matthias Heinrich; Felix Dreisow; Thomas Pertsch; Stefan Nolte; Andreas Tünnermann; Falk Lederer; Lluis Torner

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 a strong impact on the threshold of soliton excitation as well as on the light energy drift and diffraction spreading.

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Lluis Torner

Polytechnic University of Catalonia

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Victor A. Vysloukh

Universidad de las Américas Puebla

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Alexander Szameit

Technion – Israel Institute of Technology

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Alexander Szameit

Technion – Israel Institute of Technology

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