Now showing items 21-40 of 56

    • 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
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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 ...
    • Existence loci of bound states in the continuum in the parameter space of anisotropic planar structures 

      Mukherjee, Samyobrata; Gomis Bresco, Jordi; Pujol Closa, Maria del Pilar; Artigas García, David; Torner Sabata, Lluís (Optical Society of American (OSA), 2019)
      Conference lecture
      Open Access
      Bound states in the continuum (BICs), first predicted in the field of quantum physics [1], are localized radiationless states existing in the part of the spectrum that corresponds to radiative modes. BICs are a general ...
    • Fast monitoring of in-vivo conformational changes in myosin using single scan polarization- SHG microscopy 

      Psilodimitrakopoulos, Sotiris; Loza Álvarez, Pablo; Artigas García, David (2014-12-01)
      Article
      Restricted access - publisher's policy
      Fast imaging of molecular changes under high-resolution and label-free conditions are essential for understanding in-vivo processes, however, current techniques are not able to monitor such changes in real time. Polarization ...
    • Generation of multicolor spatial solitons with pulsed light 

      Carrasco Rodríguez, Sílvia; Pérez Torres, Juan; Artigas García, David; Torner Sabata, Lluís (2001-05)
      Article
      Restricted access - publisher's policy
      The impact of temporal effects to the generation of multiple wave quadratic spatial solitons with pulsed light is shown. We examine soliton formation under conditions of second-harmonic generation but our conclusions are ...
    • Imaging amylopectin's order in starch using 3-dimensional polarization SHG 

      Psilodimitrakopoulos, Sotiris; Amat Roldán, Iván; Artigas García, David; Loza Álvarez, Pablo (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2011)
      Conference report
      Restricted access - publisher's policy
      In minimally destructive SHG biomedical imaging (high resolution optical slicing) is greatly desirable to extract the maximum of information from the light matter interaction. Here we develop a 3-D biophysical model and ...
    • La fotònica revoluciona les telecomunicacions 

      Torner Sabata, Lluís; Pérez Torres, Juan; Artigas García, David; Santos Blanco, M. Concepción (1998-12)
      Article
      Open Access
    • Las Telecomunicaciones fotónicas hacen posible super-internet 

      Torres, Juan P.; Torner Sabata, Lluís; Artigas García, David; Santos, María C. (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1998)
      Article
      Open Access
    • Lossless directional guiding of light in dielectric nanosheets using Dyakonov surface waves 

      Takayama, Osamu; Artigas García, David; Torner Sabata, Lluís (2014-06-01)
      Article
      Restricted access - publisher's policy
      Guiding light at the nanoscale is usually accomplished using surface plasmons(1-12). However, plasmons propagating at the surface of a metal sustain propagation losses. A different type of surface excitation is the Dyakonov ...
    • Lost writing uncovered by laser two-photon fluorescence provides a terminus post quem for Roman colonization of Hispania Citerior 

      Cormack, I G; Loza-Álvarez, P; Sarrado, L; Tomás, S; Amat Roldán, Iván; Torner Sabata, Lluís; Artigas García, David; Guitart, Josep; Pera, J; Ros, J (Journal of Archeaological Science, 2007-10)
      Article
      Restricted access - publisher's policy
      In this work, two-photon absorption fluorescence is used as a non-destructive method to detect the presence of paint upon an archaeological sample. The objective was to recover writing that, due to the discoloration caused ...
    • Measurement and correction of in vivo sample aberrations employing a nonlinear guide-star in two-photon excited fluorescence microscopy 

      Aviles Espinosa, Rodrigo; Andilla, Jordi; Porcar-Guezenec, Rafael; Olarte, Omar E.; Nieto, Marta; Levecq, Xavier; Artigas García, David; Loza Álvarez, Pablo (2011-11-01)
      Article
      Open Access
      We demonstrate that sample induced aberrations can be measured in a nonlinear microscope. This uses the fact that two-photon excited fluorescence naturally produces a localized point source inside the sample: the nonlinear ...
    • Nano guiding of light using Dyakonov waves 

      Takayama, Osamu; Torner Sabata, Lluís; Artigas García, David (2014-12)
      Article
      Restricted access - publisher's policy
      This special issue of Optics & Photonics News highlights the most exciting peer-reviewed optics research to have emerged over the past 12 months.
    • Nano Guiding of Light Using Dyakonov Waves 

      Takayama, Osamu; Artigas García, David; Torner Sabata, Lluís (OSA, 2014-12-01)
      Article
      Open Access
    • Nonlinear resonant conversion of modes in optical waveguides 

      Dios Otín, Víctor Federico; Shvartsburg, Alexander B.; Artigas García, David; Canal Bienzobas, Fernando (ELSEVIER SCIENCE BV, 1995-07-31)
      Article
      Open Access
      A new class of resonant exchange of power among three co-propagating modes in dielectric optical waveguides exhibiting Kerr-like nonlinearity is reported. Unlike the coupling of modes travelling in different, spatially ...
    • Observation of Dyakonov surface waves 

      Takayama, Osamu; Crasovan, I; Artigas García, David; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2009)
      Conference report
      Restricted access - publisher's policy
      Summary form only given. A special type of surface wave was predicted by M. I. Dyakonov in 1988. Such waves exist under special conditions at the interface of transparent anisotropic materials, and hens they are lossless. ...
    • Observation of Dyakonov surface waves 

      Takayama, Osamu; Crasovan, L; Artigas García, David; Torner Sabata, Lluís (2009-01)
      Article
      Restricted access - publisher's policy
      We report the first experimental observation of Dyakonov surface waves existing at the interface of transparent anisotropic crystals. A Otto-Kretchmann configuration was used to excite the surface waves at the interface ...
    • Optical Dyakonov surface waves at magnetic interfaces 

      Crasovan, L C; Artigas García, David; Mihalache, Dumitru; Torner Sabata, Lluís (2005-11)
      Article
      Restricted access - publisher's policy
      We address the existence and properties of lossless surface waves that form at interfaces between magnetic and birefringent media. We show that the angular domain of existence of Dyakonov surface waves for magnetic interfaces ...
    • ORGANITZACIÓ DE LA PRODUCCIÓ (Examen 1r quadrimestre, 2n parcial) 

      Artigas García, David; Espot Piñol, Carmen; Borrell Matas, Marc (Universitat Politècnica de Catalunya, 2013-01-14)
      Exam
      Restricted access to the UPC academic community
    • Phase space description of nonlinear directional couplers 

      Artigas García, David; Dios Otín, Víctor Federico (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1994-07-01)
      Article
      Open Access
      A comprehensive analysis of the symmetric nonlinear directional coupler as a function of the excitation conditions is reported. The analysis is based on a coupled-mode technique in normalized (dimensionless) parameters, ...
    • Phase space description of nonlinear directional couplers 

      Artigas García, David; Dios Otín, Víctor Federico (1994-07)
      Article
      Open Access
      A comprehensive analysis of the symmetric nonlinear directional coupler as a function of the excitation conditions is reported. The analysis is based on a coupled-mode technique in normalized (dimensionless) parameters, ...