Now showing items 1-15 of 15

  • 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)
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    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 ...
  • Inhibition of light tunneling in waveguide arrays 

    Szameit, Alexander; Kartashov, Yaroslav V.; Dreisow, Felix; Heinrich, Matthias; Pertsch, T; Nolte, Stefan; Tunnermann, A; Vysloukh, Victor A.; Lederer, F; Torner Sabata, Lluís (2009-04)
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    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 ...
  • Nonlinearity-induced broadening of resonances in dynamically modulated couplers 

    Szameit, Alexander; Kartashov, Yaroslav V.; Heinrich, Matthias; Dreisow, Felix; Keil, R; Nolte, Stefan; Tunnermann, A; Vysloukh, Victor A.; Lederer, F; Torner Sabata, Lluís (2009-01)
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    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 ...
  • Observation of two-dimensional defect surface solitons 

    Szameit, Alexander; Kartashov, Yaroslav V.; Heinrich, Matthias; Dreisow, Felix; Pertsch, T; Nolte, Stefan; Tunnermann, A; Lederer, F; Vysloukh, Victor A.; Torner Sabata, Lluís (2009-03)
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    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 ...
  • Observation of two-dimensional lattice interface solitons 

    Szameit, Alexander; Kartashov, Yaroslav V.; Dreisow, Felix; Heinrich, Matthias; Vysloukh, Victor A.; Pertsch, T; Nolte, Stefan; Tunnermann, A; Lederer, F; Torner Sabata, Lluís (2008-04)
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    We report on the experimental observation of two-dimensional solitons at the interface between square and hexagonal waveguide arrays. In addition to the different symmetries of the lattices, the influence of a varying ...
  • Robust soliton clusters in media with competing cubic and quintic nonlinearities 

    Mihalache, Dumitru; Mazilu, D; Crasovan, L.C.; Malomed, Boris A.; Lederer, F; Torner Sabata, Lluís (2003-10)
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    Systematic results are reported for dynamics of circular patterns (“necklaces”), composed of fundamental solitons and carrying orbital angular momentum, in the two-dimensional model, which describes the propagation of light ...
  • Soliton clusters in 3D media with competing cubic and quintic nonlinearities 

    Mihalache, Dumitru; Mazilu, D; Crasovan, L C; Malomed, B A; Lederer, F; Torner Sabata, Lluís (2004-04)
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    We introduce a class of robust soliton clusters composed of N fundamental solitons in three-dimensional media combining the self-focusing cubic and self-defocusing quintic nonlinearities. The angular momentum is lent to ...
  • Stable 3D solitons supported by competing quadratic and self-focusing cubic nonlinearities 

    Mihalache, Dumitru; Mazilu, D; Malomed, B A; Lederer, F; Crasovan, L -C; Kartashov, Yaroslav V.; Torner Sabata, Lluís (2006-10)
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    We show that the quadratic (¿(2)) interaction of fundamental and second harmonics in a bulk dispersive medium, combined with self-focusing cubic (¿(3)) nonlinearity, give rise to stable three-dimensional spatiotemporal ...
  • Stable 3D spinning optical solitons supported by competing quadratic and cubic nonlinearities 

    Mihalache, Dumitru; Mazilu, D; Crasovan, L C; Towers, I; Malomed, B A; Buryak, A V; Torner Sabata, Lluís; Lederer, F (2002-09)
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    We show that the quadratic interaction of fundamental and second harmonics in a bulk dispersive medium, combined with self-defocusing cubic nonlinearity, gives rise to completely localized spatiotemporal solitons (vortex ...
  • Stable solitons of even and odd parities supported by competing nonlocal nonlinearities 

    Mihalache, Dumitru; Mazilu, D; Lederer, F; Crasovan, L -C; Kartashov, Yaroslav V.; Torner Sabata, Lluís; Malomed, B A (2006-12)
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    We introduce a one-dimensional phenomenological model of a nonlocal medium featuring focusing cubic and defocusing quintic nonlocal optical nonlinearities. By means of numerical methods, we find families of solitons of two ...
  • Stable spatiotemporal solitons in Bessel optical lattices 

    Mihalache, Dumitru; Mazilu, D; Lederer, F; Malomed, B A; Kartashov, Yaroslav V.; Crasovan, L C; Torner Sabata, Lluís (2005-08)
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    We investigate the existence and stability of three-dimensional solitons supported by cylindrical Bessel lattices in self-focusing media. If the lattice strength exceeds a threshold value, we show numerically, and using ...
  • Stable three-dimensional solitons in attarctive Bose-Einstein condensates loaded in an optical lattice 

    Mihalache, Dumitru; Mazilu, D; Lederer, F; Malomed, B A; Crasovan, L C; Kartashov, Yaroslav V.; Torner Sabata, Lluís (2005-08)
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    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 ...
  • Stable vortex tori in the three-dimensional cubic-quintic Ginzburg-Landau equation 

    Mihalache, Dumitru; Mazilu, D; Lederer, F; Kartashov, Yaroslav V.; Crasovan, L -C; Torner Sabata, Lluís; Malomed, B A (2006-08)
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    We demonstrate the existence of stable toroidal dissipative solitons with the inner phase field in the form of rotating spirals, corresponding to vorticity S=0, 1, and 2, in the complex Ginzburg-Landau equation with the ...
  • Three-dimensional spatiotemporal optical solitons in nonlocal nonlinear media 

    Mihalache, Dumitru; Mazilu, D; Lederer, F; Malomed, B A; Kartashov, Yaroslav V.; Crasovan, L C; Torner Sabata, Lluís (2006-01)
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    We demonstrate the existence of stable three-dimensional spatiotemporal solitons (STSs) in media with a nonlocal cubic nonlinearity. Fundamental (nonspinning) STSs forming one-parameter families are stable if their propagation ...
  • Three-dimensional walking spatiotemporal solitons in quadratic media 

    Mihalache, Dumitru; Mazilu, D; Crasovan, L; Torner Sabata, Lluís; Malomed, B; Lederer, F (2000-11)
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    Two-parameter families of chirped stationary three-dimensional spatiotemporal solitons in dispersive quadratically nonlinear optical media featuring type-I second-harmonic generation are constructed in the presence of ...