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Wyszukujesz frazę "Jovanović, R." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Gaussian-Induced Rotation in Triangular Photonic Lattices
    Autorzy:
    Jović, D.
    Prvanović, S.
    Jovanović, R.
    Petrović, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047884.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    Time-dependent rotation of counterpropagating mutually incoherent self-trapped Gaussian beams in periodic optically induced fixed photonic lattices is numerically investigated. Rotation occurs for some values of control parameters. For parameters of such rotation, the solitonic solutions are found using modified Petviashvili's method. It is shown that they correspond to the lowest values of propagation constant in the power diagrams and relation between observed rotation and less confined discrete solitonic solutions are demonstrated.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1067-1072
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Counterpropagating Matter Waves in Optical Lattices
    Autorzy:
    Prvanović, S.
    Jović, D.
    Jovanović, R.
    Strinić, A.
    Belić, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791206.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Lm
    Opis:
    An investigation of Bose-Einstein condensate in two-dimensional optical lattice potentials, formed by laser beams, is carried out. We are interested in the dynamics of Bose-Einstein condensate in a square optical lattice, where the periodic potential can lead to the stabilization of an otherwise unstable Bose-Einstein condensate. The behavior of Bose-Einstein condensate in optical lattices is described by the nonlinear Gross-Pitaevskii equation, which we treat numerically. By applying the Petviashvili iteration method, we demonstrate the existence of solitonic solutions in the case of counterpropagating matter waves, and analyze their stability.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 507-509
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dancing Light: Counterpropagating Beams in Photorefractive Crystals
    Autorzy:
    Belić, M.
    Petrović, M.
    Jović, D.
    Strinić, A.
    Arsenović, D.
    Prvanović, S.
    Jovanović, R.
    Petrović, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814046.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    A review of work on the dynamical behavior of counterpropagating incoherent laser beams in photorefractive crystals is presented. Numerical study of counterpropagating beams of different type is carried out, in both space and time, using an appropriate theoretical model. The development of patterns in broad hyper-Gaussian counterpropagating beams in saturable Kerr-like media is investigated, by varying the width of beams. Rotational properties of counterpropagating mutually incoherent self-trapped vortex beams in optically induced fixed photonic lattices are also investigated numerically. One of the fundamental quantum mechanical phenomena is observed for the counterpropagating beams in photonic lattices, the tunneling of light from the first to the higher-order bands of the lattice band gap spectrum. The transfer of angular momentum from vortex beams to optically induced photonic lattices is also demonstrated. For the interacting beams it is found that the sum of angular momenta of counterpropagating components is not a conserved quantity, but the difference is. In the fixed lattices there is always a considerable loss of angular momentum.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 729-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of the (3,12,12) Hexagonal Archimedean Photonic Crystal
    Autorzy:
    Jovanović, Ð.
    Gajić, R.
    Hingerl, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795628.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Qs
    61.50.Ah
    41.20.Jb
    42.25.Bs
    42.25.Gy
    Opis:
    We present a theoretical research of the optical properties of the (3,12,12) hexagonal 2D Archimedean photonic crystals. The structures are made of GaAs dielectric rods in air. Our research is mainly focused on analyzing symmetry properties of the modes and the appearance of the uncoupled modes which strongly affects the propagation of the wave and the optical performances of the material.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 642-644
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waveguiding Effect in GaAs 2D Hexagonal Photonic Crystal Tiling
    Autorzy:
    Jovanović, Ð.
    Gajić, R.
    Djokić, D.
    Hingerl, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807811.pdf
    Data publikacji:
    2009-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Bs
    42.70.Qs
    42.82.Et
    Opis:
    In this paper we theoretically study (with plane wave expansion and finite-difference time-domain models) waveguiding effect of the 2D hexagonal dielectric photonic crystal tiling. The structure is made of GaAs dielectric rods in air. We perform the calculations of the band structures, equi-frequency contours and electromagnetic propagation through the new type of the photonic crystal and self-collimation waveguides making it possible for application.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 1; 55-57
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carrier Dynamics in Quantum Cascade Lasers
    Autorzy:
    Harrison, P.
    Indjin, D.
    Jovanović, V. D.
    Mirčetić, A.
    Ikonić, Z.
    Kelsall, R. W.
    McTavish, J.
    Savić, I.
    Vukmirović, N.
    Milanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041634.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.-v
    Opis:
    A fully quantum-mechanical model for carrier scattering transport in semiconductor intersubband devices was applied to modelling of carrier dynamics in quantum cascade lasers. The standard model uses the envelope function and effective mass approximations to solve electron band structure under an applied bias. The k·p model has been employed in p-type systems where the more complex band structure requires it. The resulting wave functions are then used to evaluate all relevant carrier-phonon, carrier-carrier and alloy scattering rates from each quantised state to all others within the same and the neighbouring period. This piece of information is then used to construct a rate equation for the equilibrium carrier density in each subband and this set of coupled rate equations are solved self-consistently to obtain the carrier density in each eigenstate. The latter is a fundamental description of the device and can be used to calculate the current density and gain as a function of the applied bias and temperature, which in turn yields the threshold current and expected temperature dependence of the device characteristics. A recent extension which includes a further iteration of an energy balance equation also yields the electron (or hole) temperature over the subbands. This paper will review the method and describe its application to mid-infrared and terahertz, GaAs, GaN, and SiGe cascade laser designs.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 75-81
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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