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Wyświetlanie 1-15 z 19
Tytuł:
Optical Soliton Perturbation in Nonlinear Directional Couplers
Autorzy:
Vega-Guzman, J.
Babatin, M.
Biswas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030598.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
solitons
couplers
metamaterials
Opis:
This paper secures soliton solutions to optical couplers in presence of Hamiltonian perturbation terms by the aid of undetermined coefficients. Both twin core couplers and multiple core couplers are studied. Bright, dark and singular soliton solutions are obtained for the model. The existence criteria for the solitons are also presented. The study is focused to the Kerr and power laws of nonlinearity.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 167-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Metallic Pattern for Enhancement of a THz Field in a Two-Dimensional Electron Plasma
Autorzy:
Tarkowski, T.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033104.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Metamaterials
THz field enhancement
Opis:
A metamaterial in the form of a periodic lattice of split-ring resonators on a GaAs/AlGaAs heterostructure was numerically studied at terahertz frequencies. A finite-difference time-domain algorithm was applied to calculate distribution of the electromagnetic field in the layer positioned at 100 nm below the heterostructure surface where a two-dimensional electron gas typically resides in real structures. The results allowed to determine the resonant frequencies of the metamaterial as well as an enhancement factor of the electric field as a function of the period of the metamaterial's lattice.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 332-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity enhancement of metamaterial-based surface plasmon resonance biosensor for near infrared
Autorzy:
Pal, S.
Prajapati, Y. K.
Saini, J. P.
Singh, V.
Powiązania:
https://bibliotekanauki.pl/articles/173477.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metamaterials
sensor sensitivity
reflectance
evanescent field
Opis:
The present study investigates the angular response and sensitivity of a surface plasmon resonance biosensor with metamaterial, by taking the advantage of the remarkable property of metamaterials. The proposed biosensor numerically shows that silver with a metamaterial layer enhances the sensitivity. The thickness of metamaterial and silver layer has been optimized. On comparing these results with a conventional surface plasmon resonance biosensor, it is observed that the sensitivity of the proposed biosensor is improved by introducing the metamaterial. The proposed biosensor has a sensitivity 6.3124 times higher than that of the conventional surface plasmon resonance sensor.
Źródło:
Optica Applicata; 2016, 46, 1; 131-143
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of orthogonal-polarized waves in 1D metamaterial with kerr nonlinearity
Autorzy:
Ampilogov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1940704.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
metamaterials
wave interaction
orthogonal polarized waves
Opis:
The investigation of the wave propagation in a 1D metamaterial is continued in this paper. A nonlinear evolution equation of the wave interaction of two polarizations by means of the projection operator method is obtained and a particular solution in the case of slow-varying envelopes is found.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 149-163
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear and nonlinear ΤM polarized surface waves in anisotropic metamaterials
Autorzy:
Ali, Munazza Zulfiqar
Powiązania:
https://bibliotekanauki.pl/articles/173995.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anisotropic metamaterials
surface plasmons
nonlinear waves
Opis:
The metamaterial with an effective permeability and/or permittivity tensor having elements of different magnitudes and signs is termed as the anisotropic metamaterial. The hyperbolic metamaterial may be considered as a subclass of the anisotropic metamaterial. The dispersion relation for the transverse magnetic surface waves at the interface between a nonlinear dielectric material and an anisotropic metamaterial is derived using the parallel uniaxial approximation of the permittivity tensor. This dispersion relations can be linearized by taking the nonlinear coefficient to be zero. Dispersion curves are plotted for both the linear and the nonlinear cases and are analyzed and compared in different frequency regions.
Źródło:
Optica Applicata; 2019, 49, 3; 473-486
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Honeycomb Based Graded Metamaterial Muffler with Broadband Sound Attenuation and Load Bearing Performances
Autorzy:
Li, Gen
Chen, Yan
He, Huan
Powiązania:
https://bibliotekanauki.pl/articles/2141654.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic metamaterials
honeycomb structure
phononic crystal
local resonance
Opis:
A challenge for developing acoustic metamaterials (AMMs) is considering the application of broadband muffling and load bearing capacity simultaneously. In this paper, a honeycomb based graded AMM muffler is proposed, which can widen the attenuation band and improve the structural stiffness without any external device by means of integrated design. Firstly, the acoustic and mechanical characteristics of the muffler unit cell are theoretically and numerically studied, and the graded muffler is designed based on these characteristics. The numerical results show that the graded muffler widens the attenuation bandwidth of the unit cell, and the simulation also shows that the graded muffler has greater stiffness than the uniform one. The stiffness driven muffler provides new possibilities for the design of advanced metamaterial with simultaneous sound insulation and load bearing performances.
Źródło:
Archives of Acoustics; 2022, 47, 2; 213-221
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic cylindrical cloak
Autorzy:
Premarathna, S. M.
Wijewardena Gamalath, K. A. I. L.
Powiązania:
https://bibliotekanauki.pl/articles/1192658.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Acoustic metamaterials
electromagnetic metamaterials
negative index
anisotropic’ cloaking
radially dependent FDTD method
reduced parameter model’ higher order parameter model
Opis:
Using the analogy between anisotropic acoustic metamaterials with magnetic metamaterials in transverse magnetic mode, an electromagnetic wave of 2 GHz n transverse magnetic mode, at normal incidence propagating through a two dimensional, anisotropic, semi infinite, double negative, metamaterial slab of 800 × 800 cells, embedded in free space, for the ideal loss case was simulated by a radially dependent finite difference time dependent method to study an ideal acoustic cylindrical cloak. For the simulations multiple cycle m-n-m pulses generating Gaussian beams were used as sinusoidal hard line sources. The simulations for acoustic cylindrical cloaking by a reduced parameter model and a higher order parameter model are also presented. The cloaking behaviour is largely dependent upon the transformation and not on the thickness of the cloak. The radial dependent model and the higher order transformation model are suited for acoustic cloaking.
Źródło:
World Scientific News; 2016, 47, 2; 75-88
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Metamaterials
Autorzy:
Sztyler, Bartłomiej
Strumiłło, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2141685.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic metamaterials
acoustic metasufraces
tunability
3D printing
Opis:
This review article is concerned with metamaterials, i.e. specifically engineered structures with special properties for interaction with sounds. The research on and practical design of these materials have gained momentum in the last decade, when 3D printing techniques provided the possibility to fabricate such geometrically complex structures. We briefly describe the history of research on AMMs and group them into active and passive metamaterials. For each of these groups of AMMs, we discuss the most notable construction achievements and outline the main applications. We conclude this review with a discussion of possible directions for further research and main applications of AMMs such as noise attenuation, acoustic lens, and the cloaking phenomenon.
Źródło:
Archives of Acoustics; 2022, 47, 1; 3-14
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a visible dual broadband nearly perfect absorber
Autorzy:
Jia, Xiuli
Powiązania:
https://bibliotekanauki.pl/articles/174436.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metamaterials
visible absorber
polarization-independent
nearly perfect absorption
Opis:
Many optical systems benefit from elements that can absorb a broad range of wavelengths over a wide range of angles, independent of polarization. In this paper, we present a nearly perfect absorber with dual broadband and polarization-independent in the visible regime that exploits strong symmetric and asymmetric resonance modes of electromagnetic dipoles. It makes use of a bilayer hollowed-out cross pattern structure which is simple, having five layers that include two stacks of metal film with hollowed-out ribbon in cross patterns, two dielectric spacers, and a metal reflecting layer. Simulations show that the design exhibits a significantly enhanced absorption property when compared to a device with a normal cross pattern structure. The nearly perfect absorption efficiency of the device is above 98.5% at two resonances regimes: from 5.57 × 1014to 6.08 × 1014Hz and from 6.75 × 1014to 7.05 × 1014Hz, and its stable absorption characteristics can be maintained over a wide range of polarizing angle – up to ±90°. This strategy can, in principle, be applied to other material systems and could be useful in diverse applications, including thermal emitters, photovoltaics, and photodetectors.
Źródło:
Optica Applicata; 2019, 49, 1; 115-124
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photonic band gap in negative ternary refractive indices of two-dimensional photonic crystal
Autorzy:
Gharaati, A
Mohamadebrahimi, L
Roozitalab, Z
Powiązania:
https://bibliotekanauki.pl/articles/174931.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
negative refraction
two dimensional photonic crystals
metamaterials
band gaps
Opis:
In this paper, we study propagation of electromagnetic wave in negative ternary refractive indices of two-dimensional photonic crystals. We consider two structures with two concentric cylindrical rod and shell in which one of them has negative refractive indices, in positive dielectric background. It is shown that by increasing the diameter of the rod in both structures, we can obtain more and wider band gaps in comparison with the structures in which there is no negative refractive index materials. This increase is more considerable in the first structure, in which the rod has a negative refractive index, in comparison with the second one, where the rod has a positive refractive index.
Źródło:
Optica Applicata; 2014, 44, 4; 637-648
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General equation for directed electromagnetic wave propagation in 1D metamaterial: projecting operator method
Autorzy:
Ampilogov, D.
Leble, S.
Powiązania:
https://bibliotekanauki.pl/articles/1938596.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
metamaterials
directed waves interactions
Drude dispersion
Kerr nonlinearity
solitary solutions
Opis:
We consider a boundary regime problem for 1D wave propagation in a metamaterial medium with simultaneously negative dielectric permittivity and magnetic permeability. We apply a projecting operator method to the Maxwell system in the time domain that allows the space of the linear propagation problem to be split into subspaces of directed waves for the relations of a given material with general dispersion. After projection, the equations for directed waves have a maximally simplified form, which is most convenient for numerical and analytical integration. Matrix elements of the projectors act as integral operators. For a given nonlinearity and dispersion we derive a general system of interacting right/left waves with combined (hybrid) amplitudes. The result is specified for the Drude metamaterial model for both permittivity and permeability coefficients and the Kerr nonlinearity. We also discuss and investigate singular solitary wave solutions of the system as a limit stationary elliptic system related to some boundary regimes.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 143-155
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ typu przekładki na transmisję złożenia dwóch struktur binarnych
The influence of the type of separator material in the combination of two binary structures
Autorzy:
Szota, M.
Powiązania:
https://bibliotekanauki.pl/articles/407762.pdf
Data publikacji:
2014
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
propagacja
supersieci
metamateriały
filtry optyczne
propagation
superlattice
metamaterials
optical filters
Opis:
W pracy przedstawiono metody symulacji transmisji układów wielowarstwowych oraz zbadano wpływ zmiany typu oraz grubości warstwy materiału rozdzielającego dwie struktury wielowarstwowe. Do analizy wykorzystano metodę macierzową. Wykazano znaczący wpływ niejednorodności wykonania warstwy rozdzielającej (przekładki) na transmisję oraz znacznie mniejszy niedokładności wykonania grubości warstwy.
The paper presents a simulation method of multilayers transmission and examines the impact of changes in the type and thickness of the material separating the two multilayer structures. For the analysis, the matrix method were used. It has been shown significantly influence the implementation of the separation layer inhomogeneities on the transmission and significantly smaller of thickness inaccuracies implementation.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 3; 23-26
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotropy analysis of metamaterials
Analiza izotropii metamateriałów
Autorzy:
Kalvach, A.
Szabó, Z.
Powiązania:
https://bibliotekanauki.pl/articles/407868.pdf
Data publikacji:
2015
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
homogenization
metamaterials
electromagnetic wave propagation
homogenizacja
metamateriały
propagacja fali elektromagnetycznej
Opis:
Metamaterials – artificial periodic structures with subwavelength feature sizes – can be characterized with macroscopic electromagnetic properties, like refractive index and wave impedance, just like homogeneous materials. However, in contrast to homogeneous materials, their properties depend strongly on the angle of incidence. 3D metamaterial structures can exhibit homogeneous behaviour, but their fabrication is challenging compared to layered (2D) metamaterials. Here we demonstrate with an example, that layered (2D) metamaterials can also exhibit homogeneous behaviour despite of their anisotropic geometry.
Metamateriały – sztuczne struktury periodyczne o wymiarze charakterystycznym porównywalnym z długością fali – można scharakteryzować za pomocą tych samych właściwości jak dla materiałów homogenicznych np. współczynnikiem załamania czy impedancją falową. Jednakże, w przeciwieństwie do materiałów homogenicznych, ic parametry silnie zależą od kąta padania fali. Trójwymiarowe struktury metamateriałów mogą wykazywać jednorodne zachowanie, ale ich wykonanie jest trudne w porównaniu do metamateriałów warstwowych (2D). W artykule pokazujemy na przykładzie, że metamateriały warstwowe (2D) mogą również wykazywać jednorodne zachowanie pomimo ich anizotropowej geometrii.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 4; 52-54
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Acoustic Properties of a Metamaterial with a Multi-Ring Structure
Autorzy:
Szczepański, Grzegorz
Podleśna, Marlena
Morzyński, Leszek
Włudarczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/31339790.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic metamaterials
numerical research
experimental research
finite element method
multiring structures
Opis:
In this article, the authors present the geometry and measurements of the properties of an acoustic metamaterial with a structure composed of multiple concentric rings. CAD models of the structure were developed and subsequently used in numerical studies, which included the study of resonant frequencies using the Lanczos method and an analysis of sound pressure level distribution under plane wave excitation using the finite element method. Subsequently, experimental tests were carried out on models with the same geometry produced with three different materials (PLA, PET-G, and FLEX) using a fused deposition modeling 3D printing technique. These tests included: determining insertion loss for a single model based on tests using the measurement window of a reverberation chamber and determining transmission loss through tests in a semi-anechoic chamber. Sound wave resonance was obtained for frequencies ranging from 1700 to 6000 Hz. Notably, the experimental studies were carried out for the same structure for which numerical tests were conducted. The physical models of a metamaterial were manufactured using three different readily available 3D printing materials. The results of laboratory tests confirm that the created acoustic metamaterial consisting of multi-ring structures reduces noise in medium and high frequencies.
Źródło:
Archives of Acoustics; 2023, 48, 4; 497-507
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trapped mode resonances in metalo-dielectric structures with electric asymmetry materials
Autorzy:
Rotaru, M.D.
Sykulski, J.K.
Powiązania:
https://bibliotekanauki.pl/articles/141338.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
jakość
metamateriały elektromagnetyczne
asymetria elektryczna
trapped mode resonance
high quality factor
electromagnetic metamaterials
electrical asymmetry
Opis:
This paper investigates the possibility of exciting high quality trapped resonant modes on frequency selective surfaces consisting of identical sub-wavelength metallic inclusions (symmetrically split rings) with no structural asymmetry but exhibitting electrical asymmetry. The electrical symmetry is broken by using different dielectric substrates. The existence of such anti-symmetric trapped mode on geometrical symmetric structure is demonstrated through numerical simulation. Numerical results suggest that the high quality factor observed for these resonant modes is achieved via weak coupling between the "trapped modes" and free space which enables the excitation of these modes.
Źródło:
Archives of Electrical Engineering; 2011, 60, 1; 85-93
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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