Now showing items 1-20 of 49

  • Ab initio dissipative solitons in an all-photonic crystal resonator 

    Etrich, C.; Iliew, R.; Staliunas, Kestutis; Lederer, Falk; Egorov, Oleg A. (2011-08-25)
    Article
    Open Access
    We identify dissipative solitons in a Kerr-nonlinear all-photonic crystal resonator by solving Maxwell’s equations directly. The photonic crystal allows for diffraction management, leading to solitons with unique properties. ...
  • 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
    Open Access
    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 ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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 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)
    Conference lecture
    Restricted access - publisher's policy
    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 ...
  • Beam focalization by chirped mirrors 

    Cheng, Yu Chieh; Peckus, Martynas; Kicas, Simonas; Trull Silvestre, José Francisco; Cojocaru, Crina; Vilaseca Alavedra, Ramon; Drazdys, Ramutis; Staliunas, Kestutis (Optical Society of American (OSA), 2014)
    Conference report
    Restricted access - confidentiality agreement
    A novel application of chirped dielectric mirrors for narrow beam focalization is proposed and demonstrated numerically and experimentally. Analogy to temporal dispersion compensation by chirped dielectric mirrors is discussed.
  • Beam focalization in reflection from flat dielectric subwavelength gratings 

    Cheng, Yu Chieh; Zeng, H; Trullàs Simó, Joaquim; Cojocaru, Crina; Malinauskas, Mangirdas; Jukna, T; Wiersma, D.S.; Staliunas, Kestutis (2014-10-15)
    Article
    Restricted access - publisher's policy
    We experimentally demonstrate the recently predicted effect of near-field focusing for light beams from flat dielectric subwavelength gratings (SWGs). This SWGs were designed for visible light 532 nm and fabricated by ...
  • Beam focusing in chirped mirror with a defect 

    Cheng, Yu Chieh; Staliunas, Kestutis (IEEE Press ; Wiley, 2004)
    Conference report
    Restricted access - publisher's policy
    Recently the beam focusing in reflection from chirped dielectric mirror has been proposed and demonstrated, where the negative (anomalous) diffraction is responsible for this flat mirror focusing. For a strong focusing ...
  • Beam focusing in reflections from flat subwavelength diffraction gratings 

    Cheng, Yu Chieh; Redondo, Javier; Staliunas, Kestutis (2014-03-10)
    Article
    Open Access
    We predict that narrow beams, reflecting from flat subwavelength diffraction gratings, can focus. The effect is shown for the beams of electromagnetic radiation; however, it should be observable for beams of waves of ...
  • Beam shaping in spatially modulated broad-area semiconductor amplifiers 

    Herrero Simon, Ramon; Botey Cumella, Muriel; Radziunas, Mindaugas; Staliunas, Kestutis (2012-12-15)
    Article
    Open Access
    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, ...
  • 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)
    Part of book or chapter of book
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
    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.
  • Controllable light diffraction in woodpile photonic crystals filled with liquid crystal 

    Ho, Chih-Hua; Cheng, Yu Chieh; Maigyte, Lina; Zeng, H; Trull Silvestre, José Francisco; Cojocaru, Crina; Wiersma, D.S.; Staliunas, Kestutis (2015-01-12)
    Article
    Open Access
    An approach to switching between different patterns of light beams transmitted through the woodpile photonic crystals filled with liquid crystals is proposed. The phase transition between the nematic and isotropic liquid ...
  • Diffraction control of reflected beam by chirped mirror 

    Cheng, Yu Chieh; Peckus, Martynas; Kicas, S.; Trull Silvestre, José Francisco; Cojocaru, Crina; Vilaseca Alavedra, Ramon; Drazdys, R.; Staliunas, Kestutis (2013)
    Conference lecture
    Restricted access - publisher's policy
    We propose and demonstrate a novel functionality of chirped mirror for monochromatic light beams: a diffraction control in reflections resulting in focusing or imaging of beams. The chirped mirrors, commonly used for ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Dispersion management in spatially modulated broad band semiconductors 

    Herrero Simon, Ramon; Botey Cumella, Muriel; Khumar, N.P.; Staliunas, Kestutis (IEEE, 2011)
    Conference report
    Restricted access - publisher's policy
  • 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
    Open Access
    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. ...
  • Enhancement of sound by soft reflections in exponentially chirped crystals 

    Cebrecos, A.; Pico Vila, Rubén; Sánchez Morcillo, Victor José; Staliunas, Kestutis; Romero García, Vicenç; Garcia Raffi, Luis Miguel (2014-12-01)
    Article
    Open Access
    The enhancement of sound inside a two dimensional exponentially chirped crystal during the soft reflections of waves is experimentally and theoretically explored in this work. The control of this enhancement is achieved ...
  • Experimental demonstration of bistable phase locking in a photorefractive oscillator 

    Kolpakov, S.; Silva, F.; de Valcarcel, German J.; Roldán, Eugenio; Staliunas, Kestutis (2012)
    Article
    Open Access
    We report experimental evidence of bistable phase locking in nonlinear optics, in particular, in a photorefractive oscillator emitting in few transverse modes. Bistable phase locking is a recently proposed method for ...
  • Experimental demonstration of phase bistability in a broad-area optical oscillator with injected signal 

    Martinez Lorente, R.; Esteban Martin, A.; Roldan, E.; Staliunas, Kestutis; de Valcarcel Gonzalvo, German Jose; Silva, F. (2015-11-30)
    Article
    Open Access
  • 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
    Open Access
    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 ...