Exploració per tema "Àrees temàtiques de la UPC::Física::Física de partícules::Fotons"

Ara es mostren els items 1-20 de 25

    • Adaptive optics multiphoton microscopy to study ex vivo ocular tissues 

      Bueno García, Juan Manuel; Gualda Manzano, Emilio José; Artal Soriano, Pablo (2010)
      Article
      Accés restringit per política de l'editorial
      We develop an adaptive optics (AO) multiphoton microscope by incorporating a deformable mirror and a Hartmann-Shack wavefront sensor. The AO module operating in closed-loop is used to correct for the aberrations of the ...

    • Anderson localization in Bragg-guiding arrays with negative defects 

      Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (2012-10)
      Article
      Accés restringit per política de l'editorial
      We show that Anderson localization is possible in waveguide arrays with periodically spaced defect waveguides having a lower refractive index. Such localization is mediated by Bragg reflection, and it takes place even if ...

    • Application of Photon Strength Functions to (n,gamma) measurements with the n_TOF TAC 

      Guerrero, Carlos; Abbondanno, U.; Aerts, G.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Pretel Sánchez, Carme; Poch, Agustí (PoS - Proceedings of Science, 2018)
      Text en actes de congrés
      Accés obert
      The neutron capture cross section measurements at the CERN n_TOF facility are performed using a new detection system, the segmented Total Absorption Calorimeter (TAC). All measurements are performed in reference to the ...

    • Assistante Chef de Projet : Open Innovation 

      Llodrà Homar, Antònia Immaculada (Universitat Politècnica de Catalunya / École Centrale Nantes, 2011)
      Projecte/Treball Final de Carrera
      Accés obert
      Le projet consiste à mettre en place un Challenge. POPsud veut réaliser un concours pour mobiliser une communauté optique et photonique internationale sur un sujet donné et ainsi aboutir à un bouillonnement d’idées et ...

    • Cerenkov third-harmonic generation in chi((2)) nonlinear photonic crystal 

      Sheng, Yan; Wang, Wenjie; Shiloh, Roy; Roppo, Vito; Kong, Y.; Arie, Ady; Krolikowski, W. (2011-06-13)
      Article
      Accés obert
      We report on the observation of Čerenkov emission of a third-harmonic frequency in a two-dimensional nonlinear photonic crystal, where the second-order nonlinearity chi((2)) is spatially modulated by the reversal of ...

    • Characterization of dielectric spheres by spiral imaging 

      Petrov, Dimitri; Rahuel, Nicolás; Molina Terriza, Gabriel; Torner Sabata, Lluís (2012)
      Article
      Accés obert
      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 ...

    • Competing Ultrafast Energy Relaxation Pathways in Photoexcited Graphene 

      Jensen, S. A.; Mics, Z.; Ivanov, I.; Varol, H. S.; Turchinovich, D.; Bonn, M.; Tielrooij, K. J. (ACS Publications, 2014-09-23)
      Article
      Accés obert

    • Development of novel nanostructured devices for photonic touch sensing 

      Grau Martínez, Alberto (Universitat Politècnica de Catalunya, 2021-07-10)
      Projecte Final de Màster Oficial
      Accés restringit per acord de confidencialitat
      In this work the first attempt of developing a novel pressure sensor based on the use of ordered nanostructures embedded on a custom made PDMS optical fiber is shown. When building a nanostructure, the order highly affects ...

    • Globally-linked vortex clusters 

      Crasovan, L C; Vekslerchik, V; Mihalache, Dumitru; Pérez Torres, Juan; Perez-Garcia, V M; Torner Sabata, Lluís (Kluwer, 2004-09-30)
      Capítol de llibre
      Accés restringit per política de l'editorial
      We show the existence of a rich variety of fully stationary vortex structures made of an increasing number of vortices nested in paraxial wave fields confined by symmetric and asymmetric harmonic trapping potentials in ...

    • High spatial entanglement via chirped quasi-phase-matched optical parametric down-conversion 

      Svozilik, Jiri; Perina, Jr., Jan; Pérez Torres, Juan (2012-11)
      Article
      Accés obert
      By making use of the spatial shape of paired photons, parametric down-conversion allows the generation of two-photon entanglement in a multidimensional Hilbert space. How much entanglement can be generated in this way? In ...

    • Implementation of a spatial two-dimensional quantum random walk with tunable decoherence 

      Svozilik, Jiri; León Montiel, R.D.J.; Pérez Torres, Juan (2012-11)
      Article
      Accés obert
      We put forward a versatile and highly scalable experimental setup for the realization of discrete two-dimensional quantum random walks with a single-qubit coin and tunable degree of decoherence. The proposed scheme makes ...

    • In situ photoelectron spectroscopy study of ethanol steam reforming over RhPd nanoparticles and RhPd/CeO2 

      Jiménez Divins, Nuria; Llorca Piqué, Jordi (2016-05-25)
      Article
      Accés obert
      In situ X-ray photoelectron spectroscopy (XPS) was carried out over model Rh0.5Pd0.5 nanoparticles and Rh0.5Pd0.5 nanoparticles supported on CeO2 following exposure to oxygen at 573-823 K, to hydrogen at 573 K (activation ...

    • Managing spatial diffraction through a periodic loss modulation 

      Botey Cumella, Muriel; Pradeep Kumar, Nikhil; Herrero Simon, Ramon; Maigyte, Lina; Staliunas, Kestutis (2014)
      Comunicació de congrés
      Accés obert
      We show that periodic distributions of gain or losses on the wavelength scale allow managing spatial diffraction of light beams, with no index contrast. It has been recently predicted that such artificial periodic structures, ...

    • Measurement of the temperature of atomic ensembles via which-way information 

      León Montiel, R.D.J.; Pérez Torres, Juan (2012-03-05)
      Article
      Accés restringit per política de l'editorial
      We unveil the relationship existing between the temperature of an ensemble of three-level atoms in a configuration, and the width of the emission cone of Stokes photons that are spontaneously emitted when atoms are ...

    • Multiphoton imaging microscopy at deeper layers with adaptive optics control of spherical aberration 

      Bueno García, Juan Manuel; Palacios Higueras, Raquel; Gualda Manzano, Emilio José; Artal Soriano, Pablo; Skorsetz, Martin (2013-07-17)
      Article
      Accés obert
      Despite the inherent confocality and optical sectioning capabilities of multiphoton microscopy, threedimensional (3-D) imaging of thick samples is limited by the specimen-induced aberrations. The combination of immersion ...

    • Observation of the gradual transition from one-dimensional to two-dimensional Anderson localization 

      Naether, U.; Kartashov, Yaroslav; Vysloukh, Victor A.; Nolte, S.; Tünnermann, A.; Torner Sabata, Lluís; Szameit, A. (2012-02-15)
      Article
      Accés restringit per política de l'editorial
      We study the gradual transition from one-dimensional to two-dimensional Anderson localization upon transformation of the di-mensionality of disordered waveguide arrays. An effective transition from one- to two-dimensional ...

    • Optimizing the coupling of light to plasmons through engineered dipolar scatterers 

      Abdullah, Saad (Universitat Politècnica de Catalunya, 2021-08-30)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Institut de Ciències Fotòniques (ICFO) / Universitat de Barcelona / Universitat Autònoma de Barcelona
      Surface polaritons are key elements in multiple applications within the field of nanopho- tonics because of their ability to concentrate electromagnetic energy down to length scales comparable to the wavelength λ0 of ...

    • Properties of the spatial Wigner function of entangled photon pairs 

      González, Noelia; Molina Terriza, Gabriel; Pérez Torres, Juan (2009-10)
      Article
      Accés obert
      In this paper we analyze some important characteristics of the spatial Wigner function of entangled photon pairs. We show that the Wigner description of quantum states that live in the infinite-dimensional spacemomentum degree ...

    • Quantum nonlinear optics — photon by photon 

      Chang, Darrick E.; Vuletić, Vladan; Lukin, Mikhail D. (Nature Publishin group, 2014-08-24)
      Article
      Accés obert
      The realization of strong interactions between individual photons is a long-standing goal of both fundamental and technological significance. Scientists have known for over half a century that light fields can interact ...

    • Self-sustained coherent phonon generation in optomechanical cavities 

      Navarro Urios, D.; Gomis Bresco, Jordi; Alzina, F. (Institute of Physics (IOP), 2016-09)
      Article
      Accés obert
      Optical forces can set tiny objects in states of mechanical self-sustained oscillation, spontaneously generating periodic signals by extracting power from steady sources. Miniaturized self-sustained coherent phonon sources ...