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    Wyświetlanie 1-9 z 9
    Tytuł:
    Recent advances in PBG structures
    Autorzy:
    Vorgul, I.Yu.
    Marciniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308757.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    photonic band gap
    photonic crystals
    optical communications
    Opis:
    We propose a review of word science achievements in the extremely extended for the recent few years field of photonic band gap structures The review concerns both theoretical and experimental investigations on PBG structures toward fabrication of the most optimal ones for different applications. The attention is given to the obtained results as well as to the used and developed methods.
    Źródło:
    Journal of Telecommunications and Information Technology; 2000, 1-2; 71-76
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new design of a 4-channel optical demultiplexer based on photonic crystal ring resonator using a modified Y-branch
    Autorzy:
    Fallahi, V.
    Seifouri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/174726.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    ring resonator
    optical filter
    optical demultiplexer
    photonic band gap
    Opis:
    In this paper, we propose a new structure to design a 4-channel optical demultiplexer using a modified Y-branch structure with 4 hexagonal photonic crystal ring resonators. A new optical filter with a high transfer coefficient and quality factor has been introduced and designed in the present paper using a hexagonal photonic crystal ring resonator, which has then been used to design a 4-channel optical demultiplexer. The proposed demultiplexer has an average transfer coefficient of 95.5% and a high quality factor of 4164.6. It also has a channel spacing of 2.75 nm and a spectral width of 0.4 nm. The maximum and minimum crosstalk values of the channels are –10.5 and –36.5 dB, respectively. To study the photonic band structure, the plane wave expansion method has been used and the finite-difference time-domain method has also been used to analyze the optical behavior of the structure.
    Źródło:
    Optica Applicata; 2018, 48, 2; 191-200
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved low channel spacing high quality factor four-channel demultiplexer based on photonic crystal ring resonators
    Autorzy:
    Talebzadeh, R.
    Soroosh, M.
    Mehdizadeh, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/175084.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    photonic band gap
    shell-type ring resonator
    quality factor
    crosstalk
    Opis:
    In this paper, we propose a compact structure to realize the demultiplexing operation for dense wavelength division multiplexing communication systems using improved shell-type ring resonators in a photonic crystal structure. The cross-section of the structure is 790 μm2 and is desirable for integration based on popular planar technology. To improve power transmission coupling efficiency, we introduce the phase matching condition between ring resonators and waveguides; the results exhibit near 100% transmission efficiency. To obtain a high quality factor, we use interior lower refractive indices spheres inside the ring resonators as the mirrors; a quality factor as high as 15497 is achieved. The average pass bands of channels are near 0.1 nm, and the channel spacing is approximately 0.6 nm. The wavelengths of the demultiplexer are 1549, 1549.7, 1550.3 and 1550.9 nm. The crosstalk is between –14 and –29 dB, and the mean value of the crosstalk is –18.39 dB.
    Źródło:
    Optica Applicata; 2016, 46, 4; 553-564
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of two-dimensional photonic crystal octagonal ring resonator based eight channel demultiplexer
    Autorzy:
    Kannaiyan, V.
    Dhamodharan, S. K.
    Savarimuthu, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174789.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    two-dimensional photonic crystals
    photonic band gap
    ring resonator
    waveguide
    demultiplexer
    wavelength division multiplexing
    Opis:
    We proposed a high performance eight channel demultiplexer using two-dimensional photonic crystal octagonal ring resonator for wavelength division multiplexing applications. The performance parameters such as transmission efficiency, Q factor, spectral width, resonant wavelength, crosstalk and channel spacing of the proposed demultiplexers are evaluated. The plane wave expansion method manipulates photonic band gap of periodic and non-periodic structure. Finite-difference time-domain method is used to evaluate the performance parameters of designed two-dimensional photonic crystal structure. The proposed demultiplexer provides overall transmission efficiency, Q factor, spectral width of about 98%, 1968 and 0.8 nm, respectively. The ultra-compact eight channel demultiplexer performs better than the reported one. Hence this work can be implemented for real time applications.
    Źródło:
    Optica Applicata; 2017, 47, 1; 7-18
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of low frequency TE-electromagnetic wave in ternary plasma photonic crystal
    Autorzy:
    Dehnavi, Z. N.
    Askari, H. R.
    Malekshahi, M.
    Dorranian, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/174815.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasma photonic crystal
    effective plasma frequency
    photonic band gap
    dispersion relation
    group velocity
    reflectivity
    Opis:
    In this study, the oblique incident of the electromagnetic waves with frequencies lower than plasma frequency in one dimensional ternary plasma photonic crystal has been investigated. The unit cell of crystal contains a plasma layer that is embedded in two different dielectric layers. Using the wave equation, Bloch theory, and boundary condition, the dispersion relation, the group velocity and the reflection relation of the structure have been obtained. Numerical results are presented in the form of dispersion curves. The dependence of photonic band gap characteristics on plasma frequency is discussed. One attempt has been made to show how the photonic band gap characteristic of a particular structure changes when the dielectric material of the unit cell is replaced by other dielectric materials or when the incident angle of the electromagnetic wave is changed. Results show that plasma layer characteristics has a significant effect on band gaps and wave propagation characteristics; also the results show that the proposed multi-layered structure can act as a tunable photonic crystal which can be controlled by the external parameters.
    Źródło:
    Optica Applicata; 2017, 47, 3; 457-470
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic Logic Gates in Two Dimensional Photonic Crystals for All Optical Device Design
    Autorzy:
    Sonth, Mahesh V
    Srikanth, Gimmadi
    Agrawal, Pankaj
    Premalatha, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844637.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    basic gates
    photonic crystals
    finite difference time domain
    plane wave expansion
    photonic band gap
    Opis:
    The research carried out in the field of optics and photonics with an idea to design and develop the all optical logic devices in the fascinating material known as photonic crystals (PhCs). The structural investigation reveals that the two dimensional (2-D) PhCs is more suitable for fabrication of optoelectronic components. In this article we have designed basic logic gates in 2-D PhCs as they are the building blocks for the construction of optical devices and in these, refractive index is periodically modulated with the wavelength. The understanding of light behaviour in complex PhCs helps in creating photonic band gap (PBG) that can prevent light of certain wavelength propagating in crystal lattice structure. For the selected geometry structure, three PBG bands will exists out of which two of them are transverse electric (TE) and one is transverse magnetic (TM) mode. The PBG bands in the TE mode ranges from 0.31( α λ ) to 0.46( α λ ), 0.61( α λ ) to 0.63( α λ ) and TM mode ranges from 0.86( α λ ) to 0.93( α λ ). The free space wavelength of 1550 nm is set for the finite difference time domain (FDTD) simulation of the structure. The response time and computational overhead required for the proposed OR gate is 0.128ps and 4.4MB is obtained. Also we calculated the extinction ratio for AND gate and NOT gate as 6.19 dB and 10.21 dB respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 247-261
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Narrow transmission mode in one-dimensional symmetric defective photonic crystal containing metamaterial and high Tc superconductor
    Autorzy:
    Srivastava, Sanjeev K.
    Aghajamali, Alireza
    Powiązania:
    https://bibliotekanauki.pl/articles/173630.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    photonic band gap
    transmission spectra
    transmission mode
    defect mode
    metamaterial
    negative index material
    superconductor photonic crystal
    Opis:
    We theoretically investigate the properties of narrow transmission mode (defect mode) within the reflection band in one-dimensional symmetric defective photonic crystal containing double negative metamaterial and high temperature superconductors. The transmittance spectrum of the proposed structure is obtained by using the characteristic or transfer matrix method. The results show that by increasing the thickness of air defect, transmission mode shifts towards the lower frequency side. But when the thickness of a superconductor layer is increased, transmission mode shifts towards the high frequency side. Further, the effect of temperature variation of superconducting defect on the defect mode has been investigated and found that when the temperature of superconducting layer increases the frequency of defect mode is red shifted. The shift in frequency has smaller value in the lower temperature region than in the higher temperature region, even if the change in temperature is same. Finally we have discussed the effect of variation of thickness on the defect mode by using the double negative metamaterial as defect layer in place of superconductor layer. The result shows that we get two modes for smaller thickness of double negative layer but only a single mode for larger thickness.
    Źródło:
    Optica Applicata; 2019, 49, 1; 37-50
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości kryształów fotonicznych umożliwiające ich wykorzystanie w poligrafii
    Properties of photonic crystals that enable their use in polygraphy
    Autorzy:
    Zwierzchaczewska, M.
    Podsiadło, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/128508.pdf
    Data publikacji:
    2018
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
    Tematy:
    kryształ fotoniczny
    fotoniczna przerwa wzbroniona
    współczynnik załamania światła
    zabezpieczenie dokumentów
    photonic crystal
    photonic band gap
    refractive index
    securing documents
    Opis:
    Photonic crystals are an innovative material and have recently been used in printing. They consist of dielectric layers of a variable refractive index. The change of this value may occur in one, two or three directions. Thanks to it, photonic crystals give the possibility of conscious control of the electromagnetic wave in the structure, which leads to the creation of photonic band gap, and this allows the conscious creation of color. It turns out therefore that the color is created not only as a result of the mixture of additive or subtractive basic colors, but also due to photonic changes as in the case of photonic crystals. Photonic crystals are used in printing as a method of securing documents. The deliberately designed width of the photonic band gap creates any color that can change under the influence of certain factors, such as the application of a magnetic field or a change in the angle of observation. Pigments containing photonic crystals make the item difficult to forge. So far, research has been conducted on the use of cognition of new properties of these crystals and on the use of those already known. Conducting experiments is expensive, however, the premonition of scientists allow to conclude that photonic crystals are a valuable material on which to focus more attention.
    Źródło:
    Acta Poligraphica; 2018, 12; 71-81
    2299-9981
    Pojawia się w:
    Acta Poligraphica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Światłowody fotoniczne
    Photonic crystal fibers
    Autorzy:
    Grabiec, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/208325.pdf
    Data publikacji:
    2006
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    światłowody mikrostrukturalne
    światłowody fotoniczne
    kryształy fotoniczne
    fotoniczna przerwa wzbroniona
    microstructured fibers
    photonic crystal fibers
    photonic crystals
    photonic band gap
    Opis:
    Światłowody fotoniczne stanowią nową klasę włókien optycznych, charakteryzujących się wieloma nowymi, niezwykle interesującymi właściwościami. Jedną z nich jest możliwość kształtowania parametrów włókna poprzez modelowanie parametrów jego geometrii na etapie poprzedzającym proces produkcji. W artykule przedstawiono ideę działania światłowodów fotonicznych, ich klasyfikację, budowę oraz własności, które są przydatne głównie pod kątem aplikacji telekomunikacyjnych.
    Photonic crystal fibers (PCFs) are a new class of fiber optics that are characterized by a set of new interesting features. One of them is the possibility of shaping the fiber parameters through modelling its geometry before a production process. The idea of PCFs operation, their structures and features in the light of using them in telecommunication applications are presented as well. Short characteristic of manufacturing methods of PCFs are also presented here.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2006, 55, sp.; 241-256
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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