Exploració per autor "Staliunas, Kestutis"
Ara es mostren els items 21-40 de 161
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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
Accés obertAn 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)
Comunicació de congrés
Accés restringit per política de l'editorialWe 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)
Text en actes de congrés
Accés restringit per política de l'editorialThe 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 obertWe 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 ... -
Directional invisibility by genetic optimization
Bor, Emre; Babayigit, Ceren; Kurt, H.; Staliunas, Kestutis; Turduev, M. (2018-11-26)
Article
Accés obertIn this Letter, the design of a directional optical cloaking by a genetic algorithm is proposed and realized experimentally. A three-dimensional finite-difference time-domain method is combined with the genetic optimization ... -
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 obertWe 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 -
Dissipation Induced Modulation Instability: New Applications for Frequency Combs and Pulses Generation
Perego, A.M.; Turitsyn, S.K.; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2018-11-15)
Text en actes de congrés
Accés restringit per política de l'editorialWe present a new technique based on a dissipation induced modulation instability, caused by unbalanced spectral dissipation for signal and idler waves, with applications in amplifiers and parametric oscillators but especially ... -
Dynamic higher-order Bessel-Gauss beam interference generation of rotating beams
Kontenis, Gabrielius; Gailevicius, Darius; Jiménez, Noé; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
Text en actes de congrés
Accés restringit per política de l'editorialOne of the key trends in laser material processing is the usage of structured laser beams. One such example is the Bessel beam with an elongated focal area and self-healing properties. Higher-order Bessel beams can be ... -
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 obertWe 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
Accés obertThe 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 ... -
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'editorialAmong 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 ... -
Experimental demonstration of bistable phase locking in a photorefractive oscillator
Kolpakov, S.; Silva, F.; de Valcarcel, German J.; Roldán, Eugenio; Staliunas, Kestutis (2012)
Article
Accés obertWe 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; Valcarcel Gonzalvo, Germán José de; Silva, F. (2015-11-30)
Article
Accés obert -
Experimental observation of flat focusing mirror based on photonic jet effect
Minin, Igor V.; Liu, Cheng-Yang; Yang, Yu-Chih; Staliunas, Kestutis; Minin, Oleg V. (Nature, 2020-12-01)
Article
Accés obertIn this work, we experimentally demonstrate that a thin rectangle dielectric-metal structure can have a function of a flat focusing mirror based on photonic jet effect in reflection mode. Using polydimethylsiloxane (PDMS) ... -
Extremely narrow, sharp-peaked resonances at the edge of the continuum
Lukošiunas, Ignas; Grineviciute, Lina; Nikitina, Julianija; Gailevicius, Darius; Staliunas, Kestutis (2022-11-03)
Report de recerca
Accés obertWe report a critical narrowing of resonances of a driven potential well, when their eigenfrequencies approach the edge of the continuum. The resonances also obtain unusual sharp-peak shapes at the continuum boundary. The ... -
Fano-like resonances in modulated single-layers for angular and frequency selectivity of light
Nikitina, Julianija; Babayigit, Ceren; Staliunas, Kestutis; Grineviciute, Lina (2022)
Text en actes de congrés
Accés restringit per política de l'editorialThis study was aimed to investigate the growth process of thin films on a pre-structured surface using different optically transparent materials and their optical properties. As results of conformal deposition of ion beam ... -
Fano-like resonances in nanostructured thin films for spatial filtering
Grineviciute, Lina; Nikitina, Julianija; Babayigit, Ceren; Staliunas, Kestutis (2021-03-29)
Article
Accés restringit per política de l'editorialFano-like resonant coupling of electromagnetic radiation with planar waveguiding modes of nanostructured thin films is proposed and realized experimentally. Different from conventional Fano coupling to compact resonators ... -
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 obertWe 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 obertWe 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: ...