Ara es mostren els items 1-20 de 47

  • Anisotropy-induced photonic bound states in the continuum 

    Gomis Bresco, Jordi; Artigas García, David; Torner Sabata, Lluís (Nature, 2017-03-20)
    Article
    Accés obert
    Bound states in the continuum (BICs) are radiationless localized states embedded in the part of the parameter space that otherwise corresponds to radiative modes. Many decades after their original prediction1, 2, 3 and ...
  • Asymmetrical splitting of higher-order optical solitons induced by quintic nonlinearity 

    Artigas García, David; Torner Sabata, Lluís; Pérez Torres, Juan; Akhmediev, Juan P Torres I Nail N (1997-11)
    Article
    Accés restringit per política de l'editorial
    We address the effect of quintic nonlinearities in the propagation of optical solitons in cubic nonlinear media. Our focus is on the decay of higher-order solitons in the presence of self-defocusing quintic perturbations. ...
  • Bound states in the continuum in anisotropic structures 

    Gomis Bresco, Jordi; Artigas García, David; Pujol Closa, Pilar; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    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 ...
  • Campos electromagnéticos : problemas resueltos 

    Dios Otín, Víctor Federico; Artigas García, David; Canal Bienzobas, Fernando; Recolons Martos, Jaume (Edicions UPC, 2001)
    Llibre
    Accés restringit a la comunitat UPC
    Este libro está orientado a los estudiantes de Ingeniería que se introducen con un cierto rigor en el estudio de las ondas electromagnéticas. Contiene una cuidada selección de problemas, dividida en seis capítulos, y ...
  • Compact ultrafast semiconductor disk laser: targeting GFP based nonlinear applications in living organisms 

    Loza Álvarez, Pablo; Artigas García, David; Santos, Susana I.C.O.; Aviles Espinosa, Rodrigo; Filippidis, George; Hamilton, Craig; Malcolm, Graeme; Weingarten, Kurt J.; Südmeyer, Thomas; Barbarin, Yohan; Keller, Ursula (2011-03-01)
    Article
    Accés restringit per política de l'editorial
    We present a portable ultrafast Semiconductor Disk Laser (SDL) (or vertical extended cavity surface emitting laser—VECSELs), to be used for nonlinear microscopy. The SDL is modelocked using a quantum-dot semiconductor ...
  • Continuous-wave self-pumped optical parametric oscillator based on Yb3+-doped bulk periodically-poled LiNbO3 (Mg0) 

    Capmany, J; Callejo, D; Bermúdez, V; Diéguez, E; Artigas García, David; Torner Sabata, Lluís (2001-05-15)
    Article
    Accés restringit per política de l'editorial
    We present experimental evidence of continuous-wave self-pumped parametric oscillation in Yb3+-doped periodically poled lithium niobate co-doped with MgO. A single bulk crystal of periodically poled lithium niobate containing ...
  • 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 ...
  • Decoupled illumination detection in light sheet microscopy for fast volumetric imaging 

    Olarte, Omar; Andilla, Jordi; Artigas García, David; Loza-Alvarez, Pablo (OSA, 2015-08-04)
    Article
    Accés restringit per política de l'editorial
    Current microscopy demands the visualization of large three-dimensional samples with increased sensitivity, higher resolution, and faster speed. Several imaging techniques based on widefield, point-scanning, and light-sheet ...
  • Decoupled illumination detection in light sheet microscopy for fast volumetric imaging 

    OLARTE, Omar Eduardo; Andilla, Jordi; Artigas García, David; Loza Álvarez, Pablo (Optical Society of American (OSA), 2015-08-04)
    Article
    Accés restringit per política de l'editorial
    Current microscopy demands the visualization of large threedimensional samples with increased sensitivity, higher resolution, and faster speed. Several imaging techniques based on widefield, point-scanning, and light-sheet ...
  • Depth aberrations characterization in linear and nonlinear microscopy schemes using a Shack-Hartmann wavefront sensor 

    Aviles Espinosa, Rodrigo; Andilla, Jordi; Porcar-Guezenec, Rafael; Levecq, Xavier; Artigas García, David; Loza Álvarez, Pablo (2012)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The performance of imaging devices such as linear and nonlinear microscopes (NLM) can be limited by the optical properties of the imaged sample. Such an important aspect has already been described using theoretical models ...
  • Dispersion-managed cnoidal pulse trains 

    Kartashov, Yaroslav V.; Vysloukh, Victor A.; Marti-Panameño, E.; Artigas García, David; Torner Sabata, Lluís (2003-08)
    Article
    Accés restringit per política de l'editorial
    We report on the existence and properties of breathing periodic cnoidal pulse trains propagating in dispersion managed systems with piecewise constant dispersion. Our numerical investigations show that the dispersion ...
  • Dyakonov surface wave resonant transmission 

    Takayama, Osamu; Nikitin, A. Yu; Martin-Moreno, Luis; Torner Sabata, Lluís; Artigas García, David (2011-03-28)
    Article
    Accés restringit per política de l'editorial
    The role of Dyakonov surface waves in the transmission through structures composed of birefringent media is theoretically explored. In the case of structures using prisms, unexpected high transmission above the critical ...
  • Dyakonov surface waves 

    Torner Sabata, Lluís; Artigas García, David; Takayama, Osamu (2009)
    Article
    Accés restringit per política de l'editorial
  • Dyakonov surface waves in photonic metamaterials 

    Artigas García, David; Torner Sabata, Lluís (2005-01)
    Article
    Accés restringit per política de l'editorial
    We show that suitable photonic metamaterial structures can support lossless surface waves of the form envisaged by Dyakonov. The idea we put forward is based on the birefringent properties of photonic crystals in the ...
  • Dynamic behaviour in a nonlinear directional coupler with feedback 

    Artigas García, David; Dios Otín, Víctor Federico; Canal Bienzobas, Fernando (TAYLOR & FRANCIS LTD, 1997-06-30)
    Article
    Accés obert
    A new kind of resonator based on a nonlinear directional coupler with feedback is presented. The steady states are found and the map of the system is iterated, showing the existence of bistability, period doubling and ...
  • Dynamics of quadratic soliton excitation 

    Artigas García, David; Torner Sabata, Lluís; Akhmediev, N (1999-04)
    Article
    Accés restringit per política de l'editorial
    We study the dynamics of the soliton–radiation interaction in the process of soliton excitation in quadratic nonlinear media. The focus is on the dynamics of initial signals that are not weakly perturbed exact solitons. ...
  • Effect of molecular organization on the image histograms of polarization SHG microscopy 

    Psilodimitrakopoulos, Sotiris; Amat Roldán, Iván; Loza Álvarez, Pablo; Artigas García, David (2012)
    Article
    Accés obert
    Based on its polarization dependency, second harmonic generation (PSHG) microscopy has been proven capable to structurally characterize molecular architectures in different biological samples. By exploiting this polarization ...
  • Efficiency of quadratic soliton generation 

    López Lago, Elena; Simos, Christos; Couderc, Vincent; Barthélémy, Alain; Artigas García, David; Torner Sabata, Lluís (2001-08)
    Article
    Accés restringit per política de l'editorial
    We report what is believed to be the first experimental demonstration of soliton content as a function of the intensity of input light for multicolor quadratic solitons. Experiments were conducted with spatial solitons ...
  • Enhanced localization of Dyakonov-like surface waves in left-handed materials 

    Crasovan, L C; Takayama, Osamu; Artigas García, David; Johansen, S K; Mihalache, Dumitru; Torner Sabata, Lluís (2006-10)
    Article
    Accés restringit per política de l'editorial
    We address the existence and properties of hybrid surface waves forming at interfaces between left-handed materials and dielectric birefringent media. The existence conditions of such waves are found to be highly relaxed ...
  • Estimating the helical pitch angle of amylopectin in starch using polarization second harmonic generation microscopy 

    Psilodimitrakopoulos, Sotiris; Amat Roldán, Iván; Loza Álvarez, Pablo; Artigas García, David (2010-08)
    Article
    Accés restringit per política de l'editorial
    Starch granules are among the brightest natural second harmonic generation (SHG) converters. They basically consist of amylose and amylopectin molecules and the source of the SHG signal is still undetermined. In the ...