Now showing items 1-9 of 9

  • All-dielectric self-cloaked structures 

    Hayran, Zeki; Kurt, H.; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (2018-03-17)
    Article
    Open Access
    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 ...
  • Directionality fields generated by a local Hilbert transform 

    Ahmed, W. W.; Herrero Simon, Ramon; Botey Cumella, Muriel; Hayran, Zeki; Kurt, Hamza; Staliunas, Kestutis (American Physical Society, 2018-03-15)
    Article
    Open Access
    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 ...
  • Invisibility on demand based on a generalized Hilbert transform 

    Hayran, Zeki; Herrero Simon, Ramon; Botey Cumella, Muriel; Kurt, Hamza; Staliunas, Kestutis (American Physical Society (APS), 2018-07-12)
    Article
    Open Access
    We propose a feasible invisibility approach to suppress the scattering of waves from or to given directions and for particular frequencies, i.e., invisibility on demand. We derive a generalized Hilbert transform for a ...
  • Management of Light Patterns Based on Local Hilbert Transform 

    Staliunas, Kestutis; Ahmed, W.; Botey Cumella, Muriel; Herrero Simon, Ramon; Hayran, Zeki; Kurt, H. (2018)
    Conference report
    Restricted access - publisher's policy
    We propose a new approach of optical field management based on a local Hilbert transform, where the non-Hermitian potentials generating arbitrary vector fields of directionality p(\vec r), with desired shapes and topologies ...
  • Numerical and experimental demonstration of a wavelength demultiplexer design by point-defect cavity coupled to a tapered photonic crystal waveguide 

    Hayran, Zeki; Turduev, Mirbek; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis; Kurt, Hamza (2016-01-01)
    Article
    Open Access
    We propose and experimentally demonstrate a demultiplexer with point-defect resonators and a reflection feedback mechanism in a photonic crystal waveguide (PCW). A tapered PCW has been chosen as the necessary reflector, ...
  • Polarization-independent broadband bidirectional optical cloaking using a new type of inverse scattering approach 

    Hayran, Zeki; Herrero Simon, Ramon; Botey Cumella, Muriel; Kurt, Hamza; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    Since the advent of transformation optics a decade ago [1], the ability to achieve optical cloaking has become a matter of practical realization. However, so far extreme material requirements and large device areas have ...
  • Rainbow trapping in a chirped three-dimensional photonic crystal 

    Hayran, Zeki; Kurt, Hamza; Staliunas, Kestutis (Macmillan Publishers, 2017-06-08)
    Article
    Open Access
    Light localization and intensity enhancement in a woodpile layer-by-layer photonic crystal, whose interlayer distance along the light propagation direction is gradually varied, has been theoretically predicted and ...
  • Slow light enabled wavelength demultiplexing 

    Hayran, Zeki; Turduev, M.; Botey Cumella, Muriel; Herrero Simon, Ramon; Staliunas, Kestutis; Kurt, H. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Photonic crystal waveguides supporting band gap guided modes hold great potential to tailor the group velocity of propagating light. We propose and explore different wavelength demultiplexer design approaches that ...
  • 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)
    Conference report
    Open Access
    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 ...