Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 151 results
  • 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
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2014.6876621
    Presentation's date: 2014-07-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 modulation of the refractive index on the wave length scale, which combined with an anti-symmetric gain/loss distribution on the same scale, leads to non-reciprocal light coupling at resonance frequencies. Numerical simulations show asymmetric right-left transmission of light beams.

  • Shaping of linght beams with photonic crystals: spatial filtering, beam collimation and focusing  Open access

     Maigyte, Lina
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    La recerca desenvolupada en el marc d'aquesta tesi doctoral és un estudi teòric, numèric i experimental de la modificació de la forma de feixos de llum (filtratge espacial, col·limació i focalització) en el rang visible de freqüències utilitzant estructures de cristall fotònic. Els cristalls fotònics (CFs) són materials amb una modulació periòdica de l'índex de refracció en l'escala de la longitud d'ona, i són principalment coneguts per les seves propietats relacionades amb la dispersió temporal. Tot i això, la dispersió espacial també pot ser modificada mitjançant CFs, fet que permet controlar les propietats espacials de feixos monocromàtics de llum.En la primera part de la tesi, mostrem experimentalment el fet que certes modificacions de la dispersió espacial en CFs poden donar lloc a filtratge espacial (angular) de feixos de llum. L'estudi es focalitza en la millora de l'eficiència del filtratge espacial mitjançant la introducció de "chirp" (la variació del període longitudinal de l'estructura) en el CF. A més, per tal d'incrementar l'efecte considerem diferents estructures i materials. El treball presentat en aquesta tesi doctoral acosta a la realitat la creació d'una nova generació de filtres espacials per a circuits micro-fotònics i micro-dispositius.La segona part d'aquest estudi se centra en l'anàlisi teòric, numèric i experimental de la formació de dispersió espacial negativa en CFs, la gual dóna lloc a efectes de col·limació i focalització un cop travessat el CF. Les idees desenvolupades en aquesta tesi doctoral també són aplicables a sistemes amb pèrdues, en particular a CFs metàl·lics. Els resultats de les simulacions mostren l'existència d'ambdós efectes, filtratge espacial i focalització, en CFs metàl·lics.

    The research developed in the framework of this PhD thesis is a theoretical, numerical and experimental study of light beam shaping (spatial filtering, beam collimation and focusing) in the visible frequency range using photonic crystal structures. Photonic crystals (PhCs) are materials with periodic, spatially modulated refractive index on the wavelength scale. They are primarily known for their chromatic dispersion properties. However, they can also modify the spatial dispersion, which allows managing the spatial properties of the monochromatic light beams. In the first part of my thesis we experimentally show that particular spatial dispersion modification in PhCs can lead to spatial (angular) filtering of light beams. The study is focused on the spatial filtering efficiency improvement by introducing chirp (the variation of longitudinal period of the structure) in the crystal structure. Additionally, to enhance the effect, we consider different geometries and materials. The work presented in this PhD thesis brings closer to reality the creation of a new generation spatial filters for micro-photonic circuits and micro-devices. The second part of the study is devoted to the theoretical, numerical and experimental analysis of the formation of negative spatial dispersion in PhCs, which gives rise to collimation and focusing effects behind the PhCs. The ideas developed in my PhD also work in lossy systems, in particular in metallic PhCs. The simulation results for metallic PhCs are presented, in which both effects- spatial filtering and beam focusing, are shown.

    La recerca desenvolupada en el marc d'aquesta tesi doctoral és un estudi teòric, numèric i experimental de la modificació de la forma de feixos de llum (filtratge espacial, col·limació i focalització) en el rang visible de freqüències utilitzant estructures de cristall fotònic. Els cristalls fotònics (CFs) són materials amb una modulació periòdica de l'índex de refracció en l'escala de la longitud d'ona, i són principalment coneguts per les seves propietats relacionades amb la dispersió temporal. Tot i això, la dispersió espacial també pot ser modificada mitjançant CFs, fet que permet controlar les propietats espacials de feixos monocromàtics de llum. En la primera part de la tesi, mostrem experimentalment el fet que certes modificacions de la dispersió espacial en CFs poden donar lloc a filtratge espacial (angular) de feixos de llum. L'estudi es focalitza en la millora de l'eficiència del filtratge espacial mitjançant la introducció de "chirp" (la variació del període longitudinal de l'estructura) en el CF. A més, per tal d'incrementar l'efecte considerem diferents estructures i materials. El treball presentat en aquesta tesi doctoral acosta a la realitat la creació d'una nova generació de filtres espacials per a circuits micro-fotònics i micro-dispositius. La segona part d'aquest estudi se centra en l'anàlisi teòric, numèric i experimental de la formació de dispersió espacial negativa en CFs, la gual dóna lloc a efectes de col·limació i focalització un cop travessat el CF. Les idees desenvolupades en aquesta tesi doctoral també són aplicables a sistemes amb pèrdues, en particular a CFs metàl·lics. Els resultats de les simulacions mostren l'existència d'ambdós efectes, filtratge espacial i focalització, en CFs metàl·lics.

  • Simulations and analysis of beam quality improvement in spatially modulated broad area edge-emitting devices

     Radziunas, Mindaugas; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis
    Semiconductor Lasers and Laser Dynamics
    DOI: 10.1117/12.2051909
    Presentation's date: 2014-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    We simulate and analyze how beam quality improves while being amplified in edge emitting broad area semiconductor amplifiers with a periodic structuring of the electrical contacts, in both longitudinal and lateral directions. A spatio-temporal traveling wave model is used for simulations of the dynamics and nonlinear interactions of the optical fields, induced polarizations and carrier density. In the case of small beam amplification, the optical field can be expanded into few Bloch modes, so that the system is described by a set of ODEs for the evolution of the mode amplitudes. The analysis of such model provides a deep understanding of the impact of the different parameters on amplification and on spatial (angular) filtering of the beam. It is shown that under realistic parameters the two-dimensional modulation of the current can lead not only to a significant reduction of the emission divergence, but also to an additional amplification of the emitted field

  • Access to the full text
    Managing spatial diffraction through a periodic loss modulation  Open access

     Botey Cumella, Muriel; Kumar, Nikhil Pradeep; Herrero Simon, Ramon; Maigyte, Lina; Staliunas, Kestutis
    Photonic Crystal Materials and Devices
    DOI: 10.1117/12.2051677
    Presentation's date: 2014-04
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    We show that periodic distributions of gain or losses on the wavelength scale allow managing spatial diffraction of light beams, with no index contrast. It has been recently predicted that such artificial periodic structures, analogous to Photonic Crystals (PhCs), would also hold the novel spatial beam propagation effects reported for PhCs such as subdiffraction propagation, self-collimation, spatial filtering or beam focusing by a lens with flat interfaces. In particular, we consider an ideal periodic 2-dimensional (2D) arrangement of lossy cylinders embedded in air. We analytically show that this loss distribution affects diffraction. Indeed, a significant focusing behind a thin flat-flat crystal slab is observed, following the estimation of anomalous spatial dispersion for specific frequency ranges. Besides, close to the edges of the first Brillouin Zone, the light intensity map of a Gaussian beam exiting the lossy structure exhibits a high transmission windows instead of the transmission stop band expected for PhCs. This results from the strong anisotropic attenuation provided by the loss periodicity. Finally, we also consider a more realistic system with combined modulations of refractive index and losses: a 2D metallic photonic crystal (MPhC). We demonstrate that MPhCs also support selfcollimation and focusing, being such effects associated to zero and negative diffraction respectively. Finally, due to the anisotropic attenuation of light, the structure is also able to spatially filter noisy beams.

    Postprint (author’s final draft)

  • Access to the full text
    Control and enhancement of beam quality of broadarea semiconductor devices and arrays by multimode interference couplers and two-dimensional gain modulation  Open access

     Murad, M.; Sorel, M.; Herrero Simon, Ramon; Botey Cumella, Muriel; Marsh, J.H.; Staliunas, Kestutis
    High Power Diode Lasers and Systems Conference
    p. 8-9
    DOI: 10.1109/HPD.2013.6706592
    Presentation's date: 2013-10-16
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Beam focalization in reflection from chirped dielectric mirrors

     Kicas, Simonas; Cheng, Yu Chieh; Staliunas, Kestutis; Peckus, Martynas; Trull, Jose; Cojocaru, Crina Maria; Vilaseca Alavedra, Ramon; Drazdys, Ramutis
    Optical Interference Coatings
    Presentation's date: 2013-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A novel use of chirped mirrors for narrow beam focalization is proposed. Focusing in reflection from flat chirped mirror has been demonstrated numerically and experimentally. Analogy to temporal dispersion mirrors is discussed.

  • Negative diffraction by a periodically modulated loss

     Botey Cumella, Muriel; Kumar, Nikhil Pradeep; Herrero Simon, Ramon; Maigyte, Lina; Pico Vila, Rubén; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2013.6602994
    Presentation's date: 2013-06-26
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    We show how a periodic modulation of loss on the wavelength scale provides negative diffraction propagation. In particular, we consider a 2D square arrangement of lossy cylinders embedded in air, with no index contrast. The phase-shifts accumulated in propagation trough such a structure, with flat-flat interfaces, are then compensated by normal diffraction in air leading to a substantial focalization of a light beam behind the crystal. The transmitted light intensity map exhibits a window of high transmission as a result of anisotropic loss provided by the periodicity. The effect is accounted buy the dispersion curves obtained by a coupled mode expansion of Maxwell equations and numerical experiments. The predicted phenomenon is expected to be generic for spatially modulated materials, and indeed we show that the results can be extended to acoustics.

  • 3D woodpile photonic crystal for focusing of light beams

     Maigyte, Lina; Cojocaru, Crina Maria; Purlys, Vytautas; Trull, Jose; Gailevicius, Darius; Peckus, Martynas; Malinauskas, Mangirdas; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    Presentation's date: 2013-06-25
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Focusing by a flat woodpile 3D photonic crystal

     Maigyte, Lina; Cojocaru, Crina Maria; Purlys, Vytautas; Trull, Jose; Gailevicius, Darius; Peckus, Martynas; Malinauskas, Mangirdas; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. We.C6.1-1-We.C6.1-4
    DOI: 10.1109/ICTON.2013.6602990
    Presentation's date: 2013-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    We investigate spatial propagation effect behind the Photonic Crystal under particular dispersion conditions, which lead to a near field focusing. We analyze and experimentally demonstrate full two-dimensional near field focusing of light beams at visible frequencies behind the flat three-dimensional woodpile photonic crystal. Experimental results correspond well with numerical FDTD calculations as well as with the mode expansion studies. The focusing distance of 50 - 70 µm behind the crystal is obtained.

  • Focussing by a flat woodpile 3D photonic crystal

     Maigyte, Lina; Cojocaru, Crina Maria; Purlys, Vytautas; Trull, Jose; Gailevicius, Darius; Peckus, Martynas; Malinauskas, Mangirdas; Staliunas, Kestutis
    European Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
    Presentation's date: 2013-05-15
    Presentation of work at congresses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    In this paper we investigate spatial propagation effect behind the Photonic Crystal (PhC) with nontrivial dispersion properties, which leads to a near field focusing. We analyze and experimentally demonstrate full two-dimensional focus formation of light beams at visible frequencies behind the three-dimensional woodpile photonic crystal. Experimental results correspond well with numerical FDTD calculations as well as with the mode expansion studies. The focusing distance of 60-80 micrometers behind the crystal is obtained.

  • Chirped Photonic Crystals for Spatial Filtering of Light Beams

     Maigyte, Lina; Purlys, Vytautas; Gailevicius, Darius; Peckus, Martynas; Malinauskas, Mangirdas; Staliunas, Kestutis
    European Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
    Presentation's date: 2013-05-15
    Presentation of work at congresses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    We show, theoretically and experimentally that chirped photonic crystals (longitudinal period varies along the propagation direction) can provide a substantial spatial (angular) filtering of the light beams and can reach efficiencies up to 50%.

  • Near field focusing of beams reflected by flat mirror

     Cheng, Yu Chieh; Kicas, Simonas; Peckus, Martynas; Trull, Jose; Cojocaru, Crina Maria; Drazdys, Ramutis; Vilaseca Alavedra, Ramon; Staliunas, Kestutis
    Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
    Presentation's date: 2013-05-13
    Presentation of work at congresses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    We predict generally that narrow beams can focus in reflection from the flat interface photonic structures, and we demonstrate the effect experimentally in particular realization,i.e. in reflection from one-dimensional chirped mirror with flat surface.

  • Theoretical study of beam quality improvement in spatially modulated broad area edge-emitting devices

     Radziunas, Mindaugas; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis
    European Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
    DOI: 10.1109/CLEOE-IQEC.2013.6800767
    Presentation's date: 2013-05-12
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Broad area (BA) lasers and amplifiers are robust, compact and highly efficient devices for generation of high power beams. These beams, however, suffer from a poor spatial and temporal beam quality. The stabilization and shaping of the optical beams in BA devices can be achieved, for example, by injection of the optical beam at some angle to the longitudinal axis [1], by the external optical feedback from the corresponding off-axis mirror [2], or by special geometry of the device [3].

  • Beam shaping in spatially modulated broad area semiconductor amplifiers

     Herrero Simon, Ramon; Botey Cumella, Muriel; Radziunas, Mindaugas; Staliunas, Kestutis
    European Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
    DOI: 10.1109/CLEOE-IQEC.2013.6801816
    Presentation's date: 2013-05-12
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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, predicts a spatial (angular) filtering of the radiation, which leads to a substantial improvement of the spatial quality of the beam during amplification. Quantitative analysis of spatial filtering performance is presented based on numerical integration of the paraxial propagation model and on analytical estimations.

  • Diffraction control of reflected beam by chirped mirror

     Cheng, Yu Chieh; Peckus, Martynas; Kicas, Simonas; Trull, Jose; Cojocaru, Crina Maria; Vilaseca Alavedra, Ramon; Drazdys, Ramutis; Staliunas, Kestutis
    Electro-Optical Remote Sensing, Photonic Technologies, and Applications; and Military Applications in Hyperspectral Imaging and High Spatial Resolution Sensing
    DOI: 10.1117/12.2019994
    Presentation's date: 2013-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 manipulating temporal profiles of pulses, here are applied for manipulating the spatial dispersion of a monochromatic beam. By penetrating into dielectric layers of chirped mirror, the monochromatic beam experiences the negative diffraction, therefore the beam diverge propagating in front and behind the structure in normal diffraction region can be compensated inside this structure with negative diffraction. The result is focusing or imaging of the reflected beam from a flat interface of chirped mirror without optical axis.

  • Focusing of evanescent waves by modulated sonic structures

     Romero García, Vicenç; Pico Vila, Rubén; Sánchez Morcillo, Victor José; Botey Cumella, Muriel; Herrero Simon, Ramon; Chung, Yu-Chieh; Staliunas, Kestutis
    Electrical Transport and Optical Properties of Inhomogeneous Media
    Presentation's date: 2012-09-04
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Self-collimation and spatial filtering in 2D gain/loss periodic spatially modulated materials

     Botey Cumella, Muriel; Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon; Kumar, Nikhil Pradeep
    European Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
    p. EI.P.8 TUE
    DOI: 10.1109/CLEOE.2011.5942985
    Presentation's date: 2012-05-24
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • CONTROL DE LA DIFRACCON DE LA LUZ EN MEDIOS MODULADOS

     Font Garcia, Josep Lluís; Vilaseca Alavedra, Ramon; Cojocaru, Crina Maria; Trull, Jose; Staliunas, Kestutis
    Competitive project

     Share

  • Manifestation of spatial filtering performed by 3D photonic crystals

     Maigyte, Lina; Trull, Jose; Cojocaru, Crina Maria; Gertus, T.; Peckus, Martynas; Staliunas, Kestutis; Sirutkaitis, Valdas
    SPIE Photonics Europe: Optics, Photonics, and Digital Technologies for Multimedia
    DOI: 10.1117/12.922259
    Presentation's date: 2012
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Collimation and imaging behind a woodpile photonic crystal

     Maigyte, Lina; Cojocaru, Crina Maria; Trull, Jose; Peckus, Martynas; Mizeikis, Vygantas; Malinauskas, Mangirdas; Rutkauskas, M.; Juodkazis, S.; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2012.6253921
    Presentation's date: 2012
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Spatial noise reduction in broad area semiconductors

     Herrero Simon, Ramon; Botey Cumella, Muriel; Kumar, Nikhil Pradeep; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2012.6254492
    Presentation's date: 2012
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Focalization of evanescent beams

     Botey Cumella, Muriel; Cheng, Yu Chieh; Herrero Simon, Ramon; Romero García, Vicenç; Pico Vila, Rubén; Sánchez Morcillo, Victor José; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-3
    DOI: 10.1109/ICTON.2012.6253923
    Presentation's date: 2012
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    We predict and show the existence of unlocked evanescent waves in two dimensional periodic structures. In a one dimensional periodic structure an evanescent mode are located either at the center or at the boundary of the Brillouin Zone, and the real part of wave-vectors is locked either to zero or to the modulation vector of the periodicity. However, we report an unexpected observation that this is not the case in 2D or 3D PhCs where "unlocked" complex modes can be predicted. As an interesting consequence, due to their “complex” character, or, equivalently, due to their phase freedom, beams constructed from such evanescent waves can show focalization effects. Indeed, we numerically simulate the propagation of such beams in the bandgap of PhC slabs, and we find significant focalization.

  • Woodpile photonic crystal for beam collimation

     Maigyte, Lina; Trull, Jose; Mizeikis, Vygantas; Malinauskas, Mangirdas; Juodkazis, S.; Cojocaru, Crina Maria; Rutkauskas, M.; Peckus, Martynas; Sirutkaitis, Valdas; Staliunas, Kestutis
    SPIE Photonics Europe: Optics, Photonics, and Digital Technologies for Multimedia
    p. 842511-842516
    DOI: 10.1117/12.922276
    Presentation's date: 2012
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Laser polymerization of Photonic Crystals for collimation of beams at visible wavelengths

     Maigyte, Lina; Rutkauskas, M.; Malinauskas, Mangirdas; Mizeikis, Vygantas; Juodkazis, S.; Peckus, Martynas; Sirutkaitis, Valdas; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2011.5971147
    Presentation's date: 2011-06
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Second harmonic generation in sub-diffractive two-dimensional photonic crystals

     Nistor, Ioan Cristian
    Department of Applied Physics, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Dispersion management in spatially modulated broad band semiconductors

     Herrero Simon, Ramon; Botey Cumella, Muriel; Khumar, N.P.; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2011.5971087
    Presentation's date: 2011
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Light propagation in 1D and 2D gain/loss periodic spatial modulated materials

     Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis
    International Conference on Photonic and Electromagnetic Crystal Structures
    p. 138
    Presentation's date: 2010-09-28
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Broadband third harmonic generation in disordered nonlinear photonic crystals

     Kalinowski, K.; Roppo, Vito; Wang, W.; Kong, Y.; Neshev, Dragomir N.; Cojocaru, Crina Maria; Trull, Jose; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Krolikowski, W.; Saltiel, Salomon M.; Kivshar, Yu.
    SPIE Optics+Photonics
    p. 29
    Presentation's date: 2010-08-01
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Diffractive effects in 1D and 2D gain/loss periodic spatial modulated materials

     Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2010.5549259
    Presentation's date: 2010-06-28
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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 modulation predicts the mode locked states and effects like non diffractive propagation of beams, superlaminar light propagation regimes and superdiffusion due to angular gain dependence. The last allows the management of amplification and spatial frequency filtering altogether, obtaining amplified, cleaned and focalized beams at the output of these kind of gain modulated materials. The characterization is obtained from the full Maxwell equations using the plane wave expansion (PWE) method, propagation through a given direction is simulated considering beam propagation in the paraxial approximation.

  • Broadband third harmonic generation in quadratic media with disordered ferroelectric domains

     Kalinowski, K.; Roppo, Vito; Wang, W.; Neshev, Dragomir N.; Kong, Y.; Cojocaru, Crina Maria; Trull, Jose; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Krolikowski, W.; Kivshar, Yu.
    Nonlinear Photonics
    Presentation's date: 2010-06-21
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Second and third harmonic generation in disordered quadratic nonlinear media: application to short-pulse characterization

     Roppo, Vito; Wang, W.; Kalinowski, K.; Vilaseca Alavedra, Ramon; Trull, Jose; Cojocaru, Crina Maria; Staliunas, Kestutis; Krolikowski, W.; Kivshar, Yu.
    International Conference on Transparent Optical Networks
    Presentation's date: 2010-06-27
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Experimental evidences of light beam filtering by three-dimensional photonic crystal

     Gertus, Titas; Maigyte, Lina; Peckus, Martynas; Sirutkaitis, Valdas; Staliunas, Kestutis
    International Conference on Transparent Optical Networks
    p. 1-4
    DOI: 10.1109/ICTON.2010.5548974
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • The effect of domain distribution on second harmonic generation in disordered nonlinear media

     Roppo, Vito; Saltiel, Salomon M.; Wang, W.; Kalinowski, K.; Trull, Jose; Cojocaru, Crina Maria; Neshev, Dragomir N.; Krolikowski, W.; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Kivshar, Yu.
    OSA Annual Meeting
    Presentation's date: 2009-10-11
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • PROPIETATS DINÀMIQUES I NO LINIALS DE MATERIALS I SITEMES FOTÒNICS, ELÈCTRICS I BIOLÒGICS

     Belana Punseti, Juan; Roppo, Vito; Vilaseca Alavedra, Ramon; Torrent Serra, Maria Del Carmen; Herrero Simon, Ramon; Masoller Alonso, Cristina; Staliunas, Kestutis; Mudarra Lopez, Miguel; Zamora Munt, Jordi; Tiana Alsina, Jordi; Sellarès González, Jordi; Cañadas Lorenzo, Juan Carlos; Diego Vives, Jose Antonio; Nistor, Ioan Cristian; Cojocaru, Crina Maria; Trull, Jose; Domedel Puig, Nuria; Aragoneses Aguado, Andres; Òrrit Prat, Jordi; Font Garcia, Josep Lluís; Pons Rivero, Antonio Javier; De Sancristobal Alonso, Belen; Espinar Calvo, Maria Lorena; Garcia Ojalvo, Jorge
    Competitive project

     Share

  • Research activities of the Group on Nonlinear Dynamics, Nonlinear Optics and Lasers (DONLL) at the Universitat Politència de Catalunya (Campus de Terrassa)

     Martínez, Cristina; Tiana Alsina, Jordi; Zamora Munt, Jordi; Nistor, Ioan Cristian; Roppo, Vito; Espinar Calvo, Maria Lorena; Fernandez Soler, Juanjo; Font Garcia, Josep Lluís; Cojocaru, Crina Maria; Trull, Jose; Herrero Simon, Ramon; Staliunas, Kestutis; Masoller Alonso, Cristina; Torrent Serra, Maria Del Carmen; Garcia Ojalvo, Jorge; Vilaseca Alavedra, Ramon
    Reunión Nacional de Óptica
    p. 15
    Presentation's date: 2009-09-14
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Femtosecond pulse duration measurements by transverse second harmonic generation in random nonlinear media

     Vilaseca Alavedra, Ramon; Roppo, Vito; Trull, Jose; Cojocaru, Crina Maria; Staliunas, Kestutis; Dumay, David; Krolikowski, W.; Saltiel, Salomon M.; Neshev, Dragomir N.; Kivshar, Yu.
    Nonlinear Optics: Materials, Fundamentals and Applications
    Presentation's date: 2009-07-12
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Gain/loss periodic spatial modulated materials on a wavelength scale  Open access

     Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon
    International Conference on Transparent Optical Networks
    p. 687-690
    DOI: 10.1109/ICTON.2009.5185101
    Presentation's date: 2009-01-01
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    We predict self-collimation and superdiffusion of light propagating in materials with periodically modulated gain/loss profile. The modulation is parallel and transverse to the light propagation direction and its periodicity is on the wavelength scale. The self-collimation (or diffraction-free propagation) of the beams is found, which is similar to that observed in photonic crystals. The superdiffusion is also predicted, which means a dependence of the beam amplification on the propagation direction, which results in the spatial frequency filtering of the beams. We justify the predictions by the numerical simulations of the paraxial wave propagation equations.

  • ONDAS DE LUZ EN MEDIOS LINIALES Y NOLIANIALES MODULADOS EN EL ESPACIO

     Vilaseca Alavedra, Ramon; Font Garcia, Josep Lluís; Cojocaru, Crina Maria; Trull, Jose; Staliunas, Kestutis
    Competitive project

     Share

  • Broadband second harmonic parametric scattering in ferroelectric crystals with random domain structures

     Cojocaru, Crina Maria; Trull, Jose; Fischer, R; Saltiel, S; Krolikowski, W; Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon; Kivshar, Y
    10th International Conference on Transparent Networks/7th European Symposium on Photonic Crystals
    p. 80-83
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Second harmonic generation in ferroelectric crystals with disordered nonlinear domain structure

     Trull, Jose; Cojocaru, Crina Maria; Staliunas, Kestutis; Vilaseca Alavedra, Ramon; Saltiel, S; Neshev, D; Krolikowski, W; Kivshar, Y
    NoLineal 2008
    p. 170
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Second harmonic generation of narrow beams in subdiffractive photonic crystals

     Staliunas, Kestutis; Cojocaru, Crina Maria; Trull, Jose; Herrero Simon, Ramon; Loiko, Yury
    10th International Conference on Transparent Networks/7th European Symposium on Photonic Crystals
    p. 7-8
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Optical switching and harmonic generation in semiconductor photonic crystals under non diffractive light

     Cojocaru, Crina Maria; Staliunas, Kestutis; Trull, Jose
    Competitive project

     Share

  • Femtosecond pulse duration measurements by transverse second harmonic generation in random nonlinear media

     Roppo, Vito; Trull, Jose; Cojocaru, Crina Maria; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Saltiel, S; Neshev, D; Krolikowski, W; Kivshar, Y
    European Optical Society Annual Meeting 2008
    p. 1-4
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Second harmonic generation in ferroelectric crystals with disordered nonlinear domain structure

     Trull, Jose; Cojocaru, Crina Maria; Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon; Saltiel, S; Neshev, D; Krolikowski, W; Kivshar, Y
    Conferencia Española de Nanofotónica
    p. 171-172
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Second harmonic generation of narrow beams in subdiffractive photonic crystals

     Nistor, Ioan Cristian; Staliunas, Kestutis; Cojocaru, Crina Maria; Trull, Jose; Herrero Simon, Ramon
    Conferencia Española de Nanofotónica
    p. 169-170
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Broadband second harmonic parametric scattering in ferroelectric crystals with random domains structure

     Staliunas, Kestutis
    Third 'Rio de la Plata' Workshop on Noise, Chaos and Complexity in Lasers and Nonlinear Optics
    Presentation's date: 2007-12-03
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Subdiffractive light pulses in photonic crystals

     Cojocaru, Crina Maria; Staliunas, Kestutis; Trull, Jose
    Competitive project

     Share

  • Stable subdiffractive one- and two-dimensional spatial solitons in Kerr-nonlinear photonic crystals

     Herrero Simon, Ramon; Staliunas, Kestutis; de Valcarcel Gonzalvo, German Jose; Loiko, Yury; Trull, Jose; Cojocaru, Crina Maria; Nistor, Ioan Cristian
    Nonlinear effects in photonic materials
    p. 12
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Broadband second harmonic parametric scattering in ferroelectric crystals with random domains structure

     Trull, Jose; Cojocaru, Crina Maria; Fischer, R; Saltiel, S M; Staliunas, Kestutis; Herrero Simon, Ramon; Vilaseca Alavedra, Ramon; Neshev, D N; Krolikowski, W; Kivshar, Y S
    Third 'Rio de la Plata' Workshop on Noise, Chaos and Complexity in Lasers and Nonlinear Optics
    p. 21
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Addressing optical pixel bits in a slab of dense optical material via intrinsic optical bistability

     Font Garcia, Josep Lluís; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; ROLDAN, E; de Valcarcel Gonzalvo, German Jose
    Conference on Lasers and Electro-Optics/Europe
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window