Browsing by Author "Staliunas, Kestutis"
Now showing items 1-20 of 164
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Ab initio dissipative solitons in an all-photonic crystal resonator
(2011-08-25)
Article
Open AccessWe 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
(2015-01-21)
Article
Open AccessWe 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 ... -
All-dielectric self-cloaked structures
(2018-03-17)
Article
Open AccessA 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 ... -
An equivalent lattice-modified model of interfering Bragg bandgaps and Locally Resonant Stop Bands for phononic crystal made from Locally Resonant elements
(2023-08-01)
Article
Open AccessThe design and development of advanced devices based on metamaterials to control the transmission of acoustic waves is a hot topic. An important class of these metamaterials is based on phononic crystals with Locally ... -
Angular filtering by Bragg photonic microstructures fabricated by physical vapour deposition
(2019-07-01)
Article
Open AccessWe propose and experimentally demonstrate spatial filtering by photonic crystals in a Bragg configuration. Compared to the Laue configuration, where spatial filtering was already demonstrated before, the Bragg configuration ... -
Asymmetric light transmission by using 2D PT-symmetric photonic nanostructure
(Wiley-IEEE Press, 2015)
Conference report
Restricted access - publisher's policyWe 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 light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure
(American Physical Society (APS), 2018-12-10)
Article
Open AccessIn this paper, we present the numerical and experimental demonstration of asymmetric light transmission by a compact photonic crystal (PC) structure, which sustains semi-Dirac cone dispersion. The semi-Dirac point is ... -
Asymmetric light transmission in PT-Symmetric microring resonators
(2016-03-15)
Article
Restricted access - publisher's policyWe propose a new type of add-drop microring resonator made of gain and loss materials. Microring resonators are compact, narrow band, and optical channel dropping filters. In such linear systems, light transmission to ... -
Asymmetric transmission from a 2D PT-symmetric honeycomb nanostructure
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference lecture
Restricted access - publisher's policyWe 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 ... -
Axisymmetric photonic structures with PT-symmetry
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016)
Conference report
Open AccessPT-symmetric structures in photonic crystals, combining refractive index and gain-loss modulations is becoming a research field with increasing interest due to the light directionality induced by these particular potentials. ... -
Beam focalization by chirped mirrors
(Optical Society of American (OSA), 2014)
Conference report
Restricted access - confidentiality agreementA 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
(2014-10-15)
Article
Restricted access - publisher's policyWe 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
(IEEE Press ; Wiley, 2004)
Conference report
Restricted access - publisher's policyRecently 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
(2014-03-10)
Article
Open AccessWe 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
(2012-12-15)
Article
Open AccessWe 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, ... -
Beam-combining scheme of high-power broad-area semiconductor lasers with Lyot-filtered reinjection: modeling, simulations, and experiments
(2019-07-01)
Article
Open AccessA brightness- and power-scalable polarization beam-combining scheme for high-power, broad-area semiconduc-tor laser diodes is investigated numerically and experimentally. To achieve the beam combining, we employ Lyot-filtered ... -
Brightness enhancement in Non-Hermintian VCSELs
(Optical Society of American (OSA), 2019)
Conference report
Restricted access - publisher's policyVertical Cavity Surface Emitting lasers (VCSELs) are compact and efficient light sources useful for a variety of applications. However, due to lack of a transverse mode control mechanism, such lasers suffer from poor spatial ... -
Broadband third harmonic generation in quadratic media with disordered ferroelectric domains
(2010)
Conference report
Restricted access - publisher's policyWe study nonlinear frequency generation in media with random ferroelectric domain structure. We show that randomness enables one to realize broadband third harmonic generation via cascading of two second order quasi-phase ... -
Chiral modes in 2D PT-symmetric nanostructures
(Springer International Publishing, 2015-11-15)
Part of book or chapter of book
Restricted access - publisher's policyWe 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
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Open AccessIt 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.
