Ara es mostren els items 1-20 de 100

    • A New learning experience: voluntary preparatory course for the bachelor’s degree in engineering 

      Botey Cumella, Muriel; Alcaraz, Olga (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2012-03)
      Article
      Accés obert
      This paper reports on a new experience carried out at school associated with the Technical University of Catalonia, Universitat Politècnica de Catalunya (UPC) in September 2010. The aim is to describe the organization, ...
    • Acoustically penetrable sonic crystals based on fluid-like scatterers 

      Cebrecos, A.; Romero García, Vicenç; Pico Vila, Rubén; Sánchez Morcillo, Victor José; Botey Cumella, Muriel; Herrero Simon, Ramon; Cheng, Yu Chieh; Staliunas, Kestutis (2015-01-21)
      Article
      Accés obert
      We propose a periodic structure that behaves as a fluid-fluid composite for sound waves, where the building blocks are clusters of rigid scatterers. Such building-blocks are penetrable for acoustic waves, and their properties ...
    • All-dielectric self-cloaked structures 

      Hayran, Zeki; Kurt, H.; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (2018-03-17)
      Article
      Accés obert
      A general procedure to design objects that are intrinsically invisible (without the necessity of an external cloak) has not been demonstrated so far. Here we propose a flexible method to design such self-cloaked objects ...
    • Anomalous group velocity at the high energy range of real 3D photonic nanostructures 

      Botey Cumella, Muriel; Martorell Pena, Jordi (SPIE-The International Society for Optical Engineering, 2010-04-12)
      Text en actes de congrés
      Accés obert
      We perform a theoretical study on the group velocity for finite thin artificial opal slabs made of a reduced number of layers in the spectral range where the light wavelength is on the order of the lattice parameter. The ...
    • Asymmetric light transmission by using 2D PT-symmetric photonic nanostructure 

      Turduev, M.; Botey Cumella, Muriel; Herrero Simon, Ramon; Kurt, H.; Staliunas, Kestutis; Giden, I. (Wiley-IEEE Press, 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We propose for the first time a simple realization of a two-dimensional Parity-Time symmetric hexagonal shaped photonic structure composed of honeycomb lattice. The structure has a symmetric periodic modulation of the ...
    • 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 transmission from a 2D PT-symmetric honeycomb nanostructure 

      Botey Cumella, Muriel; Herrero Simon, Ramon; Turduev, M.; Zhao, D.; Giden, I.; Kurt, H.; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      We propose a simple realization of a 2-dimensonal (2D) PT-symmetric photonic structure: a honeycomb arrangement of alternating cylinders with gain or loss in a dielectric background. The structure provides a periodic ...
    • 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. ...
    • Beam shaping in spatially modulated broad-area semiconductor amplifiers 

      Herrero Simon, Ramon; Botey Cumella, Muriel; Radziunas, Mindaugas; Staliunas, Kestutis (2012-12-15)
      Article
      Accés obert
      We propose and analyze a beam-shaping mechanism that in broad-area semiconductor amplifiers occurs due to spatial pump modulation on a micrometer scale. The study, performed under realistic parameters and conditions, ...
    • Brightness enhancement in Non-Hermintian VCSELs 

      Waseem Ahmed, Waqas; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (Optical Society of American (OSA), 2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Vertical Cavity Surface Emitting lasers (VCSELs) are compact and efficient light sources useful for a variety of applications. However, due to lack of a transverse mode control mechanism, such lasers suffer from poor spatial ...
    • Chiral modes in 2D PT-symmetric nanostructures 

      Botey Cumella, Muriel; Herrero Simon, Ramon; Turduev, M.; Kurt, H.; Staliunas, Kestutis (Springer International Publishing, 2015-11-15)
      Capítol de llibre
      Accés restringit per política de l'editorial
      We propose the stabilization of the output beam of Broad Area Semiconductor (BAS) amplifiers through the introduction of a spatially periodic modulated potential. We show that a periodic modulation of the pump profile in ...
    • Control and enhancement of beam quality of broadarea semiconductor devices and arrays by multimode interference couplers and two-dimensional gain modulation 

      Murad, M.; Sorel, M.; Herrero Simon, Ramon; Botey Cumella, Muriel; Marsh, J.H.; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés obert
      It is proposed to control the beam quality of broad-area semiconductor devices by two-dimensional structuring enforcing phase coherence across the device. First results based on MMI couplers are presented.
    • Curs 0: preparació per als estudis a l’EEBE 

      Tornil Sin, Sebastián; Botey Cumella, Muriel; Alarcón Jordán, Marta; Alcaraz Sendra, Olga; Ametller Congost, Lluís; Bruna Escuer, Pere; Camps Anaya, Germinal; Carmona Mejías, Ángeles; Claverol Aguas, Mercè; Crespo Artiaga, Daniel; Pablo Ribas, Joan de; Barrio Casado, María del; Valle Mendoza, Luis Javier del; Encinas Bachiller, Andrés Marcos; Farran Marsà, Adriana; Florido Pérez, Antonio; Gámez López, Antonio; García Senz, Domingo; Gibert Agulló, Oriol; Ikhouane, Fayçal; Jiménez Jiménez, María José; José Pont, Jordi; Linares Alegret, Manuel; Lloveras Muntané, Pol Marcel; López López, José; Macovez, Roberto; Mas Blesa, Albert; Mitjana Riera, Margarida; Muñoz Romero, José; Pardo Soto, Luis Carlos; Periago Oliver, M. Cristina; Pineda Soler, Eloi; Pradell Cara, Trinitat; Ruiz Ordóñez, Magda; Sala Cladellas, Glòria; Soler Turu, Lluís; Tamarit Mur, José Luis; Vendrell Villafruela, Xavier; Zanuy Gomara, David (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2022-05)
      Article
      Accés obert
      Aquest article presenta el desenvolupament i primers resultats d'ús d'un conjunt de cursos virtuals que pretenen proporcionar uns coneixements inicials bàsics de Matemàtiques, Física i !ímica als estudiants que accedeixen ...
    • Diffractive effects in 1D and 2D gain/loss periodic spatial modulated materials 

      Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The propagation of light through materials with periodically modulated gain can present different effects that are analyzed in the paper. The characterization of these gain/loss metamaterials (GLM) with a two-dimensional ...
    • Direct- and Inverse-design for non-Hermitian smart light management 

      Botey Cumella, Muriel; Ahmed, Waqas W.; Herrero Simon, Ramon; Staliunas, Kestutis (META Conference, 2022)
      Text en actes de congrés
      Accés obert
      We present direct and inverse-design strategies to achieve ‘on demand’ dynamical manipulation of light by non-Hermitian potentials. The direct approach, based on a generalized Hilbert Transform, widens the concept of the ...
    • Directionality fields generated by a local Hilbert transform 

      Ahmed Waseem, Waqas Waseem; Herrero Simon, Ramon; Botey Cumella, Muriel; Hayran, Zeki; Kurt, Hamza; Staliunas, Kestutis (American Physical Society, 2018-03-15)
      Article
      Accés obert
      We propose an approach based on a local Hilbert transform to design non-Hermitian potentials generating arbitrary vector fields of directionality, ¿p(¿r), with desired shapes and topologies. We derive a local Hilbert ...
    • Dispersion management in spatially modulated broad band semiconductors 

      Herrero Simon, Ramon; Botey Cumella, Muriel; Khumar, N.P.; Staliunas, Kestutis (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
    • Enhanced transmission band in periodic media with loss modulation 

      Cebrecos, A.; Pico Vila, Rubén; Romero García, Vicenç; Yasser, A.M.; Maigyte, Lina; Herrero Simon, Ramon; Botey Cumella, Muriel; Sánchez Morcillo, Victor José; Staliunas, Kestutis (2014-11-17)
      Article
      Accés obert
      We study the propagation of waves in a periodic array of absorbing layers. We report an anomalous increase of wave transmission through the structure related to a decrease of the absorption around the Bragg frequencies. ...
    • Ensembles of PT-dipoles for sound propagation management 

      Arias Casals, Helena; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (META Conference, 2022)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Among other possible designs, metamaterials constructed from ensembles of meta-dipoles emerged as a flexible platform to redirect wave fields. We present an acoustic PT-dipole constructed from two Helmholtz resonators with ...
    • Exercicis de Física I: fonaments de mecànica 

      Alcaraz Sendra, Olga; Botey Cumella, Muriel (Universitat Politècnica de Catalunya, 2013)
      Problema, exercici
      Accés obert