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1
Content available Mitigating the bending losses of the silica-titania-based rib waveguide structure
Shahbaz Muhammad, Kozłowski Łukasz, Butt Muhammad A., Piramidowicz Ryszard
Opto-Electronics Review
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2023
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Vol. 31, No. 1
art. no. e145551
EN
Optical waveguides (WGs) are widely used as interconnects in integrated optical circuits both for telecommunication and sensing applications. There are different kind of optical WG designs that offers different guiding parameters, opening a vast number of possibilities. A silica-titania (SiO₂:TiO₂) rib WG is discussed and examined by a numerical analysis in this article with a great emphasis on the analysis of bending losses and optimization. A modal analysis for different basic parameters of the WG is presented with a detailed wavelengthbased modal analysis. Various potential fabrication methods are discussed, however, a solgel method and dip-coating deposition technique are proposed for the low-cost development of such WGs. Moreover, an approach towards minimizing the bending losses by adding an upper cladding layer on the rib WG is presented and described.
2
Content available remote TiO2 waveguides thin films prepared by sol-gel method on glass substrates with and without ZnO underlayer
Bouachiba Y., Taabouche A., Bouabellou A., Hanini F., Sedrati C., Merabti H.
Materials Science Poland
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2020
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Vol. 38, No. 3
381--385
EN
TiO2 thin films have been deposited on glass substrates with and without ZnO underlayer by sol-gel dip coating process. XRD patterns show the formation of anatase phase with the diffraction lines (1 0 1) and (2 0 0) in TiO2 /glass sample. In TiO2 /(ZnO/glass) sample, TiO2 is composed of anatase phase with the diffraction line (2 0 0) but the diffraction peaks of ZnO wurtzite are also well-defined. The determination of the refractive index and the thickness of the waveguiding layers has been performed by m-lines spectroscopy. The thickness of TiO2 thin films deduced by Rutheford Backscattering Geometry (RBS) agrees well with that obtained by m-lines spectroscopy. TiO2 /glass sample exhibits one guided TE0 and TM0 polarized modes. In TiO2 /(ZnO/glass) sample, only, TE0 single mode has been excited due to cutoff condition.
3
Content available O możliwości prowadzenia poprzecznej fali powierzchniowej w warstwie sprężystej układów regularnych z periodycznymi niejednorodnościami materiałowymi
Kapelewski Jerzy, Pasternak Mateusz
Biuletyn Wojskowej Akademii Technicznej
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2020
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Vol. 69, nr 4
85--93
PL
W pracy opisano możliwość prowadzenia poprzecznych fal powierzchniowych w warstwie sprężystej z wprowadzonymi sztucznie periodycznymi niejednorodnościami materiałowymi. Fale takie w odróżnieniu od modów prowadzonych w warstwie sprężystej lub utrzymywanych przy powierzchni piezoelektryka za pomocą ciągłego lub periodycznego jej zwarcia elektrycznego mogą charakteryzować się wyższą energią oraz prędkością, czyli parametrami istotnymi dla zastosowań sensorowych. Opisano zarys teorii, wybrane jakościowe aspekty propagacji tego typu fal na powierzchni kryształów regularnych, a także wstępne wyniki prób eksperymentalnych.
EN
In the paper, the possibility of surface transversal waves existence on an elastic surface layer with artificially induced periodic inhomogeneities has been described. Such kind of waves, unlike well-known surface modes sustained close to the surface boundary by an elastic layer as well as constant or periodic electrical short, have potential to transfer higher energy with higher velocity. Such parameters are very important for applications of sensors. In the work, some outline of the theory, chosen qualitative aspects of such wave propagation on regular crystal surfaces as well as the results of preliminary experimental tests were presented.
4
Content available Simulation of optical properties of Si photonic crystals
Gamalath K. A. I. L. W., Settinayake W. A. S. C.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 19, iss. 1
87--98
EN
To investigate optical properties of Si photonic crystal waveguides, a mathematical model was set up. Finite difference time domain method was used to calculate the Maxwell’s equations numerically. For the evolution of the electromagnetic fields in the photonic crystals, simulations were done for a small lattices using Yee lattice approach. The properties of a waveguide and a power divider were investigated for 3λx 3λ photonic crystal formed from Si circular rods in air for telecommunication wavelength 1.55 μm. The model developed was satisfactory in predicting the behaviour of light in linear photonic crystals.
5
Content available Red photonic glasses and confined structures
Gonçalves R. R., Lukowiak A., Ristic D., Boulard B., Chiappini A., Chiasera A., Dorosz D., Marciniak M., Righini G. C., Ferrari M.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2014
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Vol. 62, nr 4
647--653
EN
We present some recent results obtained by our team in rare earth doped photonic glasses and confined structures, in order to give some highlights regarding the state of art in glass photonics. To evidence the unique properties of transparent glass ceramics we compare spectroscopic and structural properties between the parent glass and the glass ceramics. Starting from planar waveguides we move to spherical microresonators, a very interesting class of photonic confined structures. We also conclude the short review with some remarks about the perspective for glass photonics.
6
Content available remote Calculations of characteristics of microwave devices using artificial neural networks
Katkevicius A., Malisauskas V., Plonis D., Serackis A.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 1a
281-285
EN
Using analytical iterative methods, simulation of microwave devices is complicated: computing time is relatively long, sophisticated models are used for simulations. Possibilities to improve simulation process were discovered using the method based on artificial neural networks. An example of the algorithm, which allows the transition from iterative calculations to neural networks and allows to avoid some modelling problems arising from the iterative calculations, is proposed in this paper.
PL
Zastosowano nową metodę projektowania urządzeń mikrofalowych wykorzystująca sztuczne sieci neuronowe. W porównaniu z konwencjonalnie stosowaną metodą iteracyjną osiągnięto poprawę dokładności i szybkości obliczeń.
7
Content available remote Higher-Order FDTD schemes in contemporary computational electromagnetics: theoretical advances and applications
Kantartzis N.
Przegląd Elektrotechniczny
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2007
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R. 83, nr 6
1-12
EN
The present paper provides a brief and systematically-organized survey of higher-order finite-difference time-domain (FDTD) schemes, unraveling their potential role as a promising modeling tool in modern computational electromagnetics. Recognized as a major breakthrough in the evolution of the traditional Yee’s technique, higher-order FDTD spatial/temporal operators remain the topic of an intense scientific research. Among their incontrovertible advantages, one can discern the advanced accuracy levels even for coarse lattice resolutions, the fast convergence rates, and the controllable stability. Actually, as the fabrication standards of avant-garde systems get stricter, it is evident that such properties become very attractive for the accomplishment of optimal and credible designs. Towards this goal, particular attention is drawn on the analysis of real-world applications, like contemporary waveguide and antenna structures. Numerical verification, through several demanding examples, substantiates the merits and the contributive nature of the enhanced schemes as a means to the researcher pursuing effective substitutes to customary approaches.
PL
Przedstawiono przegląd schematów różnicowych wyższego rzędu w dziedzinie czasu – obiecującego narzędzia modelowania w elektromagnetyzmie obliczeniowym. Zwrócono szczególną uwagę na analizę współczesnych konstrukcji falowodowych i antenowych.
8
Content available remote Energy transport in plasmon waveguides on chains of metal nanoplates
Saj W. M., Antosiewicz T. J., Pniewski J., Szoplik T.
Opto-Electronics Review
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2006
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Vol. 14, No. 3
243-251
EN
An interest in energy transport in 3D chains of metal nanoparticles is oriented towards future applications in nanoscale optical devices. We consider plasmonic waveguides composed of silver nanoplates arranged in several geometries to find the one with the lowest attenuation. We investigate light propagation of 500-nm wavelength along different chains of silver nanoplates of subwavelength length and width and wavelength-size height. Energy transmission of the waveguides is analysed in the range of 400-2000 nm. We find that chain of short parallel nanoplates guides energy better than two electromagnetically coupled continuous stripes and all other considered nonparallel structures. In a wavelength range of 500-600 nm, this 2-µm long 3D waveguide transmits 39% of incident energy in a channel of λ x λ/2 cross section area.
9
Content available remote Evaluation of knock intensity using wide-band optical signal from the combustion chamber
Piernikarski D.
Journal of KONES
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2006
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Vol. 13, No. 2
371-379
EN
The paper evaluates the possibility of detection and evaluation of knock intensity using wide-band optical signal obtained from the combustion chamber of the gasoline engine. Preliminary data analysis confirmed existence of strong, statistically significant correlations between signals of indicated pressure and intensity of optical emission, and it is expected that optical signal can be successfully used for detection of knocking combustion. As knocking combustion is associated with certain frequencies of successive modes of acoustic vibrations in the combustion chamber, detection of knock and evaluation of its intensity required filtration of optical signal eliminating constant components and high-frequency noise. Knock intensity was characterized by “peak intensity of optical radiation” – defined as positive value of first derivative obtained for the filtered signal. This parameter gives useful quantitative information regarding the intensity of knocking combustion. Data analysis has shown, that occurrence of knock resulted in rapid changes in peak-to-peak amplitudes of the filtered optical signal. Further evaluation of signal properties allows for more precise description of knocking phenomena and of its intensity.
10
Nieliniowe efekty optyczne w półprzewodnikach i ich wykorzystanie w modulatorach światłowodowych
Patela S.
Elektronika : konstrukcje, technologie, zastosowania
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2006
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Vol. 47, nr 4
17-20
PL
W pracy scharakteryzowano materiały, które mogą być stosowane w bieżących i przyszłych pracach w dziedzinie fotoniki nieliniowej. Następnie zaprezentowano kilka przykładów struktur modulatora światłowodowego jako przykłady zastosowania tych materiałów.
EN
A comprehensive review is given on materials available for present and future works in the field of linear and nonlinear phonics. Afterwards, several photonics modulator structures is described as an example.
11
Content available Propagation in rectangular waveguides with a pseudochiral omega slab
Mazur J., Dorko K.
Journal of Telecommunications and Information Technology
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2002
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nr 1
52-55
EN
The transfer matrix approach is applied for analysis of waveguides loaded with a uniaxial pseudochiral omega slab. In particular a pseudochiral parallel plate and rectangular guides are investigated. Based on the numerical analysis the influence of the pseudochirality on propagation characteristics and field distribution are examined. Other feature such as a field displacement phenomenon appearing in the both considered structures due to the pseudochirality is also discussed.
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