Now showing items 21-40 of 397

    • Bandwidth-enhanced quadratic soliton formation by on-sample single-band amplification 

      Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís (2000-09)
      Article
      Restricted access - publisher's policy
      Formation of optical solitons in quadratic nonlinear media under conditions for second-harmonic generation is investigated numerically in the presence of linear amplification at the fundamental frequency band. We show that ...
    • Beam steering by x(2) trapping 

      Torner Sabata, Lluís; Torruellas, William; Stegeman, George; Menyuk, Curtis (1995-09)
      Article
      Restricted access - publisher's policy
      We show numerically the mutual dragging and locking together of intense fundamental and second-harmonic light beams propagating in second-order nonlinear media, and we discuss the potential applications of such effects for ...
    • Bloch oscillations in optical and Zeeman lattices in the presence of spin-orbit coupling 

      Kartashov, Yaroslav V.; Konotop, Vladimir V; Zezyulin, Dmitry A; Torner Sabata, Lluís (2016-11-18)
      Article
      Open Access
      We address Bloch oscillations of a spin-orbit coupled atom in periodic potentials of two types: optical and Zeeman lattices. We show that in optical lattices the spin-orbit coupling allows controlling the direction of ...
    • Bloch-wave packet control in truncated modulated optical lattices 

      Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2010-12-15)
      Article
      Restricted access - publisher's policy
      We study the reflection of Bloch wave packets at the interface of an optical lattice possessing a shallow longitudinal out-of-phase refractive index modulation in the adjacent waveguides. We show that the relation between ...
    • Bound states in the continuum in a two-dimensional PT - symmetric system 

      Kartashov, Yaroslav V.; Milian, Carles; Konotop, Vladimir V; Torner Sabata, Lluís (2018-02-01)
      Article
      Open Access
      We address a 2D parity-time (¿¿)-symmetric structure built as a chain of waveguides, where all waveguides except for the central one are conservative, while the central one is divided into two halves with gain and losses. ...
    • Bound states in the continuum in anisotropic structures 

      Gomis Bresco, Jordi; Artigas García, David; Pujol Closa, Maria del Pilar; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      We report theoretical and experimental observation of radiationless bound states in the continuum (BIC) in waveguiding anisotropic structures. BICs may have all possible polarizations and be the only possible boundstates ...
    • Bound states in the continuum in spin-orbit-coupled atomic systems 

      Kartashov, Yaroslav V.; Konotop, Vladimir V; Torner Sabata, Lluís (2017-09-14)
      Article
      Restricted access - publisher's policy
      We show that the interplay between spin-orbit coupling and Zeeman splitting in atomic systems can lead to the existence of bound states in the continuum (BICs) supported by trapping potentials. Such states have energies ...
    • Boundary effects in the Rayleigh line for a fluid out of thermal equilibrium 

      Rubí Capaceti, José Miguel; Pagonabarraga, I.; Torner Sabata, Lluís (1990-11)
      Article
      Restricted access - publisher's policy
      We analyze the effect of boundary conditions in the Rayleigh spectrum of a fluid under a temperature gradient. A specific wave vector geometry prevents coupling between temperature and velocity fluctuations and could make ...
    • Bragg guiding of domainlike nonlinear modes and kink arrays in lower-index core structures 

      Ye, F; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-06)
      Article
      Restricted access - publisher's policy
      We introduce a novel class of stable nonlinear modes trapped in a lower-index film core sandwiched between two optical lattices, or in the cylindrical core of a radial lattice, imprinted in defocusing media. Such a family ...
    • Bragg-type soliton mirror 

      Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2006-02)
      Article
      Restricted access - publisher's policy
      We study soliton reflection/transmission at the interface between uniform medium and the optical lattice with focusing Kerr nonlinearity. We reveal that such interfaces afford rich new opportunities for controlling the ...
    • Break-up of spatial solitons by cascading 

      Pérez Torres, Juan; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Conference report
      Open Access
    • 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 ...
    • Bright solitons with second-order nonlinearities 

      Torner Sabata, Lluís; Menyuk, Curtis; Stegeman, George (1995-05)
      Article
      Restricted access - publisher's policy
      We investigate the mutual trapping of intense fundamental and second-harmonic waves propagating in materials with second-order nonlinearity. Consistent with Menyuk’s robustness hypothesis of solitons, we numerically observe ...
    • Broadband light generation by noncollinear parametric down-conversion 

      Carrasco, S; Nars, M B; Sergienko, A; Saleh, B E A; Teich, M C; Pérez Torres, Juan; Torner Sabata, Lluís (2006-01)
      Article
      Restricted access - publisher's policy
      Broadband light generation is demonstrated by noncollinear spontaneous parametric downconversion with a cw pump laser. By use of a suitable noncollinear phase-matching geometry and a tightly focused pump beam, downconverted ...
    • Brownian soliton motion 

      Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2008-05)
      Article
      Restricted access - publisher's policy
      We reveal fundamental analogies between soliton dynamics in light-induced random photonic lattices and Brownian motion of particles. In particular, we discover that the average squared soliton displacement increases linearly ...
    • Cavity solitons in a microring dimer with gain and loss 

      Milián, Carles; Kartashov, Yaroslav V.; Skryabin, Dmitry V.; Torner Sabata, Lluís (2018-02-20)
      Article
      Open Access
      We address a pair of vertically coupled microring resonators with gain and loss pumped by a single-frequency field. Coupling between microrings results in a twofold splitting of the single microring resonance that increases ...
    • Characterization of dielectric spheres by spiral imaging 

      Petrov, Dimitri; Rahuel, Nicolás; Molina Terriza, Gabriel; Torner Sabata, Lluís (2012)
      Article
      Open Access
      We study the spiral spectra scattered off transparent dielectric spheres when probed by different Laguerre–Gaussian light beams, carrying nested topological wavefront dislocations. We show that such scattering data may ...
    • Clusters of cavity solitons bounded by conical radiation 

      Milián, Carles; Kartashov, Yaroslav V.; Skryabin, Dmitry V.; Torner Sabata, Lluís (American Institute of Physics (AIP), 2018-09-06)
      Article
      Open Access
      We introduce a new class of self-sustained states, which may exist as single solitons or form multisoliton clusters, in driven passive cylindrical microresonators. Remarkably, such states are stabilized by the radiation ...
    • Cnoidal wave patterns in quadratic nonlinear media 

      Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2003-07)
      Article
      Restricted access - publisher's policy
      We report the existence of whole families of stationary cnoidal, periodic wave patterns in quadratic nonlinear media. We study the main physical features of the multicolored light patterns, including their shape, contrast, ...
    • Compactons and bistability in exciton-polariton condensates 

      Kartashov, Yaroslav V.; Konotop, Vladimir V; Torner Sabata, Lluís (2012-11-15)
      Article
      Open Access
      We address stationary patterns in exciton-polariton condensates supported by a narrow external pump beam, and we discover that even in the absence of trapping potentials, such condensates may support stable localized stationary ...