Enviaments recents

  • Solitary-wave vortices in type II second-harmonic generation 

    Pérez Torres, Juan; Soto-Crespo, J M; Torner Sabata, Lluís; Petrov, Dimitri (1998-05)
    Article
    Accés restringit per política de l'editorial
    We find families of optical bright, vortex solitary waves in bulk quadratic nonlinear media under conditions for type II second-harmonic generation. We study the main properties of the families of solitary waves, including ...
  • 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 ...
  • Spatial solitons in optofluidic waveguide arrays with focusing ultrafast Kerr nonlinearity 

    Vieweg, M.; Gissibl, T.; Kartashov, Yaroslav V.; Torner Sabata, Lluís; Giessen, H. (2012)
    Article
    Accés restringit per política de l'editorial
    We present an optofluidic nonlinear waveguide array that is fabricated by selectively filling several strands of a photonic crystal fiber with the liquid CCl4, which exhibits a large focusing ultrafast Kerr nonlinearity. ...
  • Coupling plasmons and dyakonons 

    Takayama, Osamu; Artigas García, David; Torner Sabata, Lluís (2012-06-01)
    Article
    Accés restringit per política de l'editorial
    We study the coupling of plasmons and Dyakonov surface waves propagating at the interfaces between isotropic-birefringent-metal layered structures. Efficient coupling is shown to occur with a proper choice of the crystal ...
  • Stable bright and vortex solitons in photonic crystal fibers with inhomogeneous defocusing nonlinearity 

    Lobanov, Valery E.; Borovkova, Olga V.; Kartashov, Yaroslav V.; Malomed, Boris A.; Torner Sabata, Lluís (2012-06-01)
    Article
    Accés restringit per política de l'editorial
    We predict that a photonic crystal fiber whose strands are filled with a defocusing nonlinear medium can support stable bright solitons and also vortex solitons if the strength of the defocusing nonlinearity grows toward ...
  • Tunable ultrafast nonlinear optofluidic coupler 

    Vieweg, M.; Pricking, S.; Gissibl, T.; Kartashov, Yaroslav V.; Torner Sabata, Lluís; Giessen, H. (2012-03-15)
    Article
    Accés restringit per política de l'editorial
    We present an optofluidic nonlinear coupler fabricated by selective filling of two strands of a photonic crystal fiber with the liquid CCl 4 which exhibits a large ultrafast Kerr nonlinearity. We demonstrate power dependent ...
  • Object-based image coding 

    Pardàs Feliu, Montse (1997-03)
    Article
    Accés restringit per política de l'editorial
    Object-based compression methods describe images in terms of a set of regions (a partition), and of some information for each region to be used by the receiver to reconstruct the image (its texture). Different techniques ...
  • A novel ekf-based recovery in ds scheme for ds/cdma systems tracking code delay 

    Díaz Romero, M. del Pilar; Agustí Comes, Ramon (1997-04)
    Article
    Accés restringit per política de l'editorial
    Classical delay-lock loops (DLL) have beenwidely considered for code synchronization purposes inDS/CDMA systems, although they have not been devised foroperation when channel fading is present. This paper describes a new ...
  • Analysis and synthesis of textures through the inference of Boolean functions 

    Domínguez Pumar, Manuel; Torres Urgell, Lluís (1997-05)
    Article
    Accés restringit per política de l'editorial
    This work deals with Boolean functions of non-linear and linear basis. The Boolean random functions of non-linear basis were proposed by Serra (1988,1989). These functions are generated through a Poisson point process upon ...
  • Esquemas de acceso para sistemas móviles de tercera generación: cdma 

    Díaz Romero, M. del Pilar (1997-05)
    Article
    Accés obert

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