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Ara es mostren els items 122-128 de 128

    • Taming of modulation instability by spatio-temporal modulation of the potential 

      Kumar, Shubham; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (Macmillan Publishers, 2015-08-19)
      Article
      Accés obert
      Spontaneous pattern formation in a variety of spatially extended nonlinear systems always occurs through a modulation instability, sometimes called Turing instability: the homogeneous state of the system becomes unstable ...

    • Towards a feasible non-Hermitian light management 

      Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Novel physical phenomena arising from the interplay between gain and loss is beyond the recent focus on Non-Hermitian systems. The spatial symmetry breaking in such systems may lead to an arbitrarily control of the flow ...

    • Translationally invariant metamirrors for spatial filtering of light beams 

      Wang, Pei-Yu; Herrero Simon, Ramon; Botey Cumella, Muriel; Cheng, Yu-Chiech; Staliunas, Kestutis (American Physical Society (APS), 2020-07-01)
      Article
      Accés obert
      We propose a translationally invariant metamirror for light filtering in reflection. The device consists of athin transverse grating in the micron scale positioned in front of a flat mirror. We analyze the performance ...

    • Tunable wavelength-demultiplexer by tapered photonic crystal waveguide 

      Hayran, Zeki; Turduev, Mirbek; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis; Kurt, H. (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés obert
      We numerically investigate the design of a wavelength de-multiplexer based on a tapered photonic crystal waveguide. The tapered waveguide is generated by reducing the width of the channel which, in turn, provides a gradual ...

    • Turbulence control by non-Hermitian potentials 

      Benadouda Ivars, Salim; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      We propose a method to control turbulence by the introduction a non-Hermitian spatiotemporal modulation, based on the energy redirection from unstable to stable modes by the unidirectional coupling induced by these potentials ...

    • Two-dimensional complex parity-time-symmetric photonic structures 

      Turduev, M.; Botey Cumella, Muriel; Giden, I.; Herrero Simon, Ramon; Kurt, H.; Ozbay, E; Staliunas, Kestutis (2015-02-20)
      Article
      Accés obert
      We propose a simple realistic two-dimensional complex parity-time-symmetric photonic structure that is described by a non-Hermitian potential but possesses real-valued eigenvalues. The concept is developed from basic ...

    • Unphysical source of dynamic order for the natural world 

      Herrero Simon, Ramon; Farjas Silva, Jordi; Pi Vila, Francesc; Orriols Tubella, Gaspar (2016-10)
      Report de recerca
      Accés obert
      The well-defined but intricate course of time evolution exhibited by many naturally occurring phenomena suggests some source of dynamic order sustaining it. In spite of its obviousness as a problem, it has remained absent ...