Nonlocal effective parameters of a coated sphere medium

Awan, Z.A.

doi:10.1080/09500340.2014.989928

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Once the electric and magnetic polarizabilities per unit length of an isolated dielectric coated conducting rod are known then the effective parameters, i.e. effective permittivity ϵ zz and effective permeability μ yy can be found using the non-local homogenization approach given in [12,18]. Thus, the effective permittivity and effective permeability of an artificial material or a metamaterial composed of dielectric coated conducting rods can be written as,…”

Section: Effective Parameters Of a Metamaterials Composed Of Dielectrimentioning

confidence: 99%

“…Using the procedure as outlined in [18,20] and taking the incident electric field aligned along the z -axis and the incident magnetic field along the y -axis, the electric polarizability per unit length and the magnetic polarizability per unit length can be computed using the following relations, Once the electric and magnetic polarizabilities per unit length of an isolated dielectric coated conducting rod are known then the effective parameters, i.e. effective permittivity ε zz and effective permeability μ yy can be found using the non-local homogenization approach given in [12,18]. Thus, the effective permittivity and effective permeability of an artificial material or a metamaterial composed of dielectric coated conducting rods can be written as, where n = 1/ d 2 .…”

Section: Effective Parameters Of a Metamaterials Composed Of Dielectrimentioning

confidence: 99%

“…Some other interesting potential applications of SNG and DNG metamaterials have been studied and discussed by Alu and Engheta [8], Engheta et al [9], and Kshetrimayum [10]. Recently, Awan has studied the effects of ENG or MNG background metamaterials upon the reflection and transmission characteristics of a lossy wire grid [11] and the realization of a DNG metamaterial based upon the realistic material coated spherical particles [12]. It is known that a wire medium or metamaterial has spectrum of its effective permittivity as plasmonic [13,14], i.e.…”

Section: Introductionmentioning

confidence: 99%

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Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods

Awan

Ullah

et al. 2020

Int. J. Microw. Wireless Technol.

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In the first part, the scattering characteristics of an isolated dielectric coated conducting rod have been investigated. The types of considered coatings for the scattering analysis are realistic materials including barium strontium titanate, magnetodielectric, gallium arsenide, and silicon carbide. It is found that the gallium arsenide coating can be used to significantly reduce the scattering from a thin perfectly electric conducting cylindrical rod at specific observation angles. In the second part, the effective permittivity and permeability of metamaterials composed of two dimensional periodic arrangements of these dielectric coated conducting cylindrical rods have been studied. An increase in the double negative (DNG) bandwidth of a metamaterial composed of barium strontium titanate coated conducting rods has been observed in contrast to the corresponding bandwidth of a metamaterial composed of only barium strontium titanate material rods. Also an additional plasmonic epsilon negative (ENG) bandwidth has been found in case of a metamaterial composed of barium strontium titanate coated conducting rods. It is further studied that the widest ENG, mu negative, and DNG bandwidths exist for a metamaterial composed of gallium arsenide rods.

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Section: Effective Parameters Of a Metamaterials Composed Of Dielectrimentioning

confidence: 99%

Section: Effective Parameters Of a Metamaterials Composed Of Dielectrimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods

Awan

Ullah

et al. 2020

Int. J. Microw. Wireless Technol.

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“…The scattering of light by a coated sphere in terms of Debye series [13] and in the time domain [14] has been investigated. Some interesting features and applications of light scattering from coated spheres have been studied by many authors in [15][16][17][18][19][20]. Nowadays, there has been a growing interest in fields of single negative (SNG), double-negative (DNG), single near-zero (SNZ) and double nearzero (DNZ) metamaterials due to their multiple applications in various engineering fields [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Backscattering cross-section from a metamaterial coated sphere covered with a metasurface

Abbasi

Awan

Hussain

2021

Int. J. Microw. Wireless Technol.

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An analysis about the backscattering characteristics of a metamaterial coated magnetodielectric sphere covered with a metasurface has been presented. The effects of various types of metamaterial coatings and surface reactances of lossless metasurface upon the backscattering cross-section of a metamaterial coated magnetodielectric sphere covered with a metasurface have been studied. It is shown that the negligible backscattering cross-section from a double near-zero metamaterial coated magnetodielectric sphere can be enhanced significantly by using specific types of lossless metasurfaces. These types of enhanced backscattering cross-section find applications in the radar detection problems. The proposed theory is also extended to the lossy double negative metamaterial coated magnetodielectric sphere covered with a lossless metasurface. During the study, it is found that for a specific part of the lossy double negative metamaterial bandwidth, two specific types of lossless metasurfaces can be used to reduce the backscattering cross-section as compared to the backscattering cross-section of a lossy double negative metamaterial coated magnetodielectric sphere without metasurface.

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“…In our proposed nonlocal-TO (NLTO) framework, the conceptual design of the desired response is guided by the direct geometrical manipulation of the dispersion characteristics in the reciprocal space of wavenumbers, and the needed (ideal) constitutive blueprints are systematically derived in terms of wavevectordependent constitutive tensors, and subsequently approximated via parameter matching with nonlocal effective models of physical metamaterial structures. Along with the increasing availability of nonlocal effective models of metamaterial classes [20][21][22][23][24][25][26][27][28][29][30][31], we expect this approach to establish itself as an attractive option for the systematic and versatile design of artificial materials with broad field-manipulation capabilities. Among the possible applications, we have already addressed the engineering of additional extraordinary-wave phenomena as well as nonlocal signal processing [14].…”

Section: Introductionmentioning

confidence: 99%

Dispersion engineering via nonlocal transformation optics

Moccia

Castaldi

Galdi

et al. 2015

2015 USNC-URSI Radio Science Meeting (Joint With AP-S Symposium)

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Transformation optics (TO) has established itself as a powerful and versatile approach to the synthesis of metamaterials with prescribed field-manipulation capabilities, via suitable spatial modulation of their constitutive properties inspired by local distortions of the spatial coordinate reference frame. From the mathematical viewpoint, this approach can be reformulated in the frequency-wavenumber reciprocal phase space so as to engineer nonlocal interactions and spatial dispersion effects, which are becoming increasingly relevant in electrodynamics and optics. Here, we present a general nonlocal-TO framework, based on complex-valued, frequency-dependent wavenumber coordinate transformations, and explore its possible applications to scenarios of interest for dispersion engineering. A key attribute of our approach, similar to conventional TO, is the separation of the conceptual design (based on intuitive geometrical considerations) from the actual metamaterial synthesis (based on a suitable approximation of analytically derived constitutive "blueprints"). To illustrate the capabilities and potential of the proposed approach, we address the engineering (from the conceptual design to the actual synthesis) of multilayered metamaterials exhibiting various exotic dispersion effects, including "one-way" (nonreciprocal) propagation, "frozen-mode" regime, and Dirac-point conical singularities. Our approach may open up new perspectives in the systematic design of metamaterials with broad field-manipulation capabilities as well as complex spatiotemporal dispersion effects, with potential applications to nonreciprocal optics, topological photonics, and "computational metamaterials."

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Nonlocal effective parameters of a coated sphere medium

Cited by 8 publications

References 17 publications

Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods

Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods

Backscattering cross-section from a metamaterial coated sphere covered with a metasurface

Dispersion engineering via nonlocal transformation optics

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