Ara es mostren els items 21-40 de 561

    • Aplicació de la fotònica en l’oftalmologia 

      Boqué Estil·les, Glòria (Universitat Politècnica de Catalunya, 2021-02-01)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      La detecció a temps de les malalties oculars és essencial per poder actuar i evitar la pèrdua de visió. Algunes d’aquestes patologies estan associades a la pèrdua de fotoreceptors de la retina. És per aquest motiu que la ...
    • Area and laser power scalability analysis in photonic networks-on-chip 

      Abadal Cavallé, Sergi; Cabellos Aparicio, Alberto; Lázaro Villa, José Antonio; Nemirovsky, Mario; Alarcón Cot, Eduardo José; Solé Pareta, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In the last decade, the field of microprocessor architecture has seen the rise of multicore processors, which consist of the interconnection of a set of independent processing units or cores in the same chip. As the number ...
    • Arresting wave collapse by wave self-rectification 

      Crasovan, L C; Pérez Torres, Juan; Mihalache, Dumitru; Torner Sabata, Lluís (2003-08)
      Article
      Accés restringit per política de l'editorial
      We put forward a mechanism for tailoring, and even arresting, the collapse of wave packets in nonlinear media, whose dynamics is governed by nonlocal two-dimensional nonlinear Schrödinger-like equations. The key ingredient ...
    • Assessment of sea-motion influence on wind vector retrieval and atmospheric stability estimation by Doppler Wind Lidar 

      Farré Guarné, Joan (Universitat Politècnica de Catalunya, 2021-07-06)
      Treball Final de Grau
      Accés restringit per política de l'editorial
      In the context of offshore wind energy, LIDAR technology is emerging with the use of floating Doppler Wind Lidars. These offshore devices have arisen as an alternative to traditional meteorological masts in the wind resource ...
    • Asymmetric light transmission in PT-Symmetric microring resonators 

      Giden, I.; Dadashi, Kh.; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis; Kurt, Hamza (2016-03-15)
      Article
      Accés restringit per política de l'editorial
      We propose a new type of add-drop microring resonator made of gain and loss materials. Microring resonators are compact, narrow band, and optical channel dropping filters. In such linear systems, light transmission to ...
    • Asymmetric matter-wave solitons at nonlinear interfaces 

      Ye, F; Kartashov, Yaroslav V.; Torner Sabata, Lluís (2006-12)
      Article
      Accés restringit per política de l'editorial
      We predict the existence and study the basic properties of strongly asymmetric matter wave solitons that form at the interface produced by regions with different interatomic interaction strengths in pancake Bose-Einstein ...
    • Atmospheric-boundary-layer height retrieval using microwave radiometer and lidar sensors : algorithms and error estimation 

      Saeed, Umar (Universitat Politècnica de Catalunya, 2016-07-22)
      Tesi
      Accés obert
      The Atmospheric Boundary Layer Height (ABLH) is an important parameter in weather forecasting, meteorology, avionics, and air-quality and dispersion models. Local development of the Atmospheric Boundary Layer (ABL) over ...
    • Automatic compensation of polarisation drifts in an optical fibre 

      Cichy Cusi, Simon (Universitat Politècnica de Catalunya, 2020-06)
      Treball Final de Grau
      Accés obert
      In days where Science Fiction uses the word ?Quantum? to justify any weird phenomena, we are actually on the edge of the Second Quantum Revolution. The ability to harness the potential of the quantum state of single particles ...
    • Axisymmetric photonic structures with PT-symmetry 

      Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016)
      Text en actes de congrés
      Accés obert
      PT-symmetric structures in photonic crystals, combining refractive index and gain-loss modulations is becoming a research field with increasing interest due to the light directionality induced by these particular potentials. ...
    • Bandgap widening in macroporous silicon photonic crystals by multiperiodic structures 

      Segura García, Daniel; Cardador Maza, David; Vega d'Aurelio, Davide; Santos Blanco, M. Concepción; Dios Otín, Víctor Federico; Rodríguez Martínez, Ángel (Institute of Physics (IOP), 2018-05-14)
      Article
      Accés obert
      Large bandgaps with low transmission in 3D macroporous silicon photonic crystals have been proved as an interesting technology for the development of optical filters and spectroscopic MIR gas sensors. The aim of this study ...
    • Bandwidth-enhanced quadratic soliton formation by on-sample single-band amplification 

      Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís (2000-09)
      Article
      Accés restringit per política de l'editorial
      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 shaping and aberration correction using a spatial light modulator in ultracold atom experiments 

      Perez Barrera, Ana Maria (Universitat Politècnica de Catalunya, 2022-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Universitat de Barcelona / Universitat Autònoma de Barcelona
      In this report we create arbitrary intensity patterns and correct optical aberrations using a spatial light modulator (SLM), which are important requirements for ultracold atom experiments. We explore several methods based ...
    • Bloch-wave packet control in truncated modulated optical lattices 

      Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2010-12-15)
      Article
      Accés restringit per política de l'editorial
      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
      Accés obert
      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 spin-orbit-coupled atomic systems 

      Kartashov, Yaroslav V.; Konotop, Vladimir V; Torner Sabata, Lluís (2017-09-14)
      Article
      Accés restringit per política de l'editorial
      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 ...
    • 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
      Accés restringit per política de l'editorial
      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
      Accés restringit per política de l'editorial
      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 ...
    • Bright solitons from defocusing nonlinearities 

      Borovkova, Olga V.; Kartashov, Yaroslav; Torner Sabata, Lluís; Malomed, Boris A. (2011-09-19)
      Article
      Accés restringit per política de l'editorial
      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 ...
    • 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
      Accés restringit per política de l'editorial
      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
      Accés restringit per política de l'editorial
      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 ...