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Загальна кількість знайдених документів : 12
Представлено документи з 1 до 12
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Romakh V. V. Determination of Wavelengths Which Correspond to Taken Propagation Constant of Planar Waveguide by Wave Equation Fourier Transform Method [Електронний ресурс] / V. V. Romakh, V. M. Fitio // Proceedings of the International Conference Nanomaterials: Applications and Properties. - 2014. - Vol. 3, no. 1. - С. 01PCSI11-01PCSI11. - Режим доступу: http://nbuv.gov.ua/UJRN/princon_2014_3_1_13
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Yaremchuk I. One-dimensional Stationary Schrodinger Equation with the Fourier Transformation [Електронний ресурс] / I. Yaremchuk, V. Fitio, V. Romakch, Ya. Bobitski // Proceedings of the International Conference Nanomaterials: Applications and Properties. - 2014. - Vol. 3, no. 2. - С. 02NAESF07-02NAESF07. - Режим доступу: http://nbuv.gov.ua/UJRN/princon_2014_3_2_55
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Kostyukevych S. O. The new approach to identification of film reflecting holographic marks [Електронний ресурс] / S. O. Kostyukevych, L. I. Muravsky, V. M. Fitio, T. I. Voronyak, P. E. Shepeliavyi, K. V. Kostyukevych, N. L. Moskalenko, V. I. Pogoda // Semiconductor physics, quantum electronics & optoelectronics. - 2011. - Vol. 14, № 3. - С. 350-357. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2011_14_3_18 The new approach for creation of film reflecting holographic marks for optical security is proposed. Such marks are replicas of a reflecting master hologram recorded on a chalcogenide glass layer. To receive the master hologram, the joint power spectrum of a reference phase mask and an input phase mask or a transformed phase mask is produced at the plane of the hologram writing and is modulated by an inclined laser beam. If an inclined laser beam illuminates the replica recorded on a flexible substrate, phase noise including speckle noise is eliminated because the hologram carrier frequency exceeds greatly the limiting frequency of the phase noise power spectrum. Experimental results have shown the principal possibility to produce the high performance film reflecting holographic marks for security applications. The proposed approach can be combined with technologies for fabrication of rainbow holograms. In this case, the received rainbow holograms are the reflecting holographic marks simultaneously. Therefore, they can be verified not only visually, but also by means of automatic identification.
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Fitio V. M. A determination of propagation constants of symmetric planar waveguide modes in a frequency domain [Електронний ресурс] / V. M. Fitio, V. V. Romakh // Semiconductor physics, quantum electronics & optoelectronics. - 2014. - Vol. 17, № 3. - С. 252-255. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2014_17_3_9 In a new method of finding propagation constants of waveguide modes, the Fourier transform to wave equation is used. We change the differential equation by the integral one. Then we represent the latter equation in a discrete form and get the eigenvalue (square propagation constants)/eigenvector (the discrete Fourier transform of appropriate fields of waveguide modes) problem. Usage of symmetry for symmetric planar waveguides allows to expand opportunities of the new method essentially: to reduce the time of numerical calculation almost triply without loss of analysis accuracy or improve calculation accuracy.
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Yaremchuk I. Ya. Enhanced optical transmission of the triple-layer resonant waveguide structure [Електронний ресурс] / I. Ya. Yaremchuk, V. M. Fitio, Ya. V. Bobitski // Semiconductor physics, quantum electronics & optoelectronics. - 2016. - Vol. 19, № 2. - С. 156-161. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2016_19_2_6 In this paper, we propose and demonstrate a novel guided-mode resonant filter based on a metallic grating sandwiched between two dielectric layers for TE polarization. A theoretical model based on rigorous coupled wave analysis has been developed. The transmission spectra of the grating-based structure show a high transmission band with the corresponding amplitude up to 70 % inside the infra-red region. Moreover, the observed optical properties can be exactly tuned by the structural parameters. These properties allow using such structures as compact optical filters, and their spectral characteristics can be easily tuned and scaled.
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Yaremchuk Ya. Resonance phenomena in one-dimensional grating-based structures [Електронний ресурс] / Ya. Yaremchuk, V. M. Fitio, Ya. V. Bobitski // Semiconductor physics, quantum electronics & optoelectronics. - 2017. - Vol. 20, № 1. - С. 85-90. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2017_20_1_14 Enhanced optical transmission through metallic 1-D grating-based structures has been studied using the rigorous coupled wave analysis. The results have shown that optical transmission is determined by waveguide properties of the grating slit, and there is a minimum width of slit for ТЕ polarization, when high transmission occurs due to waveguide effect. In contrast, this limitation doesn't exist for TM polarization, and extraordinary transmission is obtained at the sub-wavelength slit. As a result, high transmission is reached due to resonance of electromagnetic field inside the grating slit.
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Fitio V. M. Search of mode wavelengths in planar waveguides by using the wave equation Fourier transform method [Електронний ресурс] / V. M. Fitio, V. V. Romakh, Ya. V. Bobitski // Semiconductor physics, quantum electronics & optoelectronics. - 2016. - Vol. 19, № 1. - С. 28-33. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2016_19_1_7 The article describes a numerical method based on Fourier transform for studying propagating optical waves in dielectric planar waveguides. The inverse problem to the known direct one in waveguide investigation is proposed, namely a search of light wavelengths according to taken values of propagation constants. For each constant a set of wavelengths is obtained, among which an input value of wavelength from direct problem exists necessarily. A high accuracy of the method proposed is confirmed by exact values obtained by solution of transcendental dispersion equation. This method is tested on many examples, in particular, for waveguides of different permittivity profiles or for TE and TM modes propagate there.
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Ievtushenko A. I. Wave equation solution for multilayer planar waveguides in a spatial frequency domain [Електронний ресурс] / A. I. Ievtushenko, M. G. Dusheyko, V. A. Karpyna, O. I. Bykov, P. M. Lytvyn, O. I. Olifan, V. A. Levchenko, A. A. Korchovyi, V. M. Fitio, A. V., Yaremchuk I. Y., Bobitski Y. V. Bendzyak // Semiconductor physics, quantum electronics & optoelectronics. - 2017. - Vol. 20, № 4. - С. 424-429. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2017_20_4_7
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Yaremchuk I. Ya. Optical properties of the nanocomposite materials based on plasmon nanoparticles [Електронний ресурс] / I. Ya. Yaremchuk, V. M. Fitio, T. O. Bulavinets, Y. V. Bobitski // Semiconductor physics, quantum electronics & optoelectronics. - 2018. - Vol. 21, № 2. - С. 195-199. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2018_21_2_15
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Fitio V. M. Features of planar metal/dielectric nanowaveguides [Електронний ресурс] / V. M. Fitio, A. V. Bendziak, I. Ya. Yaremchuk, Ya. V. Bobitski // Semiconductor physics, quantum electronics & optoelectronics. - 2020. - Vol. 23, № 2. - С. 168-174. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2020_23_2_11
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Fitio V. Study of the Resonance Diffraction Phenomena on Gratings by the Rigorous Coupled Wave Method with Modified Equation System [Електронний ресурс] / V. Fitio, I. Yaremchuk, A. Bendziak, Y. Bobitski // Journal of nano- and electronic physics. - 2020. - Vol. 12, no. 5. - С. 05007-1-05007-6. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2020_12_5_9
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Yaremchuk I. Surface-localized plasmon resonance in a system of randomly arranged gold nanorods on a dielectric substrate [Електронний ресурс] / I. Yaremchuk, A. Pidluzhna, P. Stakhira, O. Kuntyi, L. Sus, V. Savaryn, A. Kostruba, V. Fitio, Y. Bobitski // Ukrainian journal of physical optics. - 2021. - Vol. 22, № 2. - С. 69-82. - Режим доступу: http://nbuv.gov.ua/UJRN/UJPO_2021_22_2_3
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