Exploració per autor "Herrero Simon, Ramon"Més informacióMés informació

Ara es mostren els items 10-29 de 128

    • 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.

    • Designable Dynamical Systems for the Generalized Landau Scenario and the Nonlinear Complexification of Periodic Orbits 

      Herrero Simon, Ramon; Farjas Silva, Jordi; Pi Vila, Francesc; Orriols Tubella, Gaspar (2021-02)
      Report de recerca
      Accés obert
      We have found a way for penetrating the space of the dynamical systems towards systems of arbitrary dimension exhibiting the nonlinear mixing of a large number of oscillation modes through which extraordinarily complex ...

    • 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 ...

    • Far-field narrowing in spatially modulated broad-area edge-emitting semiconductor amplifiers 

      Radziunas, Mindaugas; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (2015-05-01)
      Article
      Accés obert
      We perform a detailed theoretical analysis of the far-field narrowing in broad-area edge-emitting semiconductor amplifiers that are electrically injected through contacts periodically modulated in both longitudinal and ...

    • Field concentration by Axisymmetric local PT-symmetry 

      Ahmed Waseem, Waqas Waseem; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2016)
      Text en actes de congrés
      Accés obert
      We propose a new class of systems holding PT-symmetry only locally; the potential fulfills: U(r-r0)=U*(-r+r0 ) in a small neighborhood of any point r0, whereas on a global scale the system is only Parity symmetric: ...

    • FÍSICA (1r quadrimestre, 2n parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2011-01-17)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Dinàmica - 1r quadrimestre 1a avaluació) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2009-11-03)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 1r quadrimestre, 1r parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2013-10-28)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 1r quadrimestre, 1r parcial) 

      Fernández Soler, Juan José; Herrero Simon, Ramon; Hervada Sala, Carme; Trull Silvestre, José Francisco; Torrent Serra, Maria del Carmen (Universitat Politècnica de Catalunya, 2014-10-31)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 1r quadrimestre, 1r parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2012-10-30)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 1r quadrimestre, 2n parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2012-01-10)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 1r quadrimestre, 2n parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2012-01-10)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen 2n quadrimestre, 2n parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2014-06-09)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen1r quadrimestre, 2n parcial) 

      Herrero Simon, Ramon (Universitat Politècnica de Catalunya, 2011-01-17)
      Examen
      Accés restringit a la comunitat UPC