Zero reflection from layered anisotropic metamaterial structures

Mirala, Ali; Abdolali, Ali

doi:10.1080/17455030.2013.791409

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…On such occasions we may turn to engineered composite materials such as metamaterials. Rather exotic dielectric anisotropies have been central to recent developments involving nanostructured composite materials which support electromagnetic phenomenons such as negative refraction [3], optical cloaking [4,5], null reflection [6], and omnidirectional radiation [7], for examples. Most significantly, the incorporation of dielectric anisotropy can enable non-magnetic composite materials to support negative refraction [8,9].…”

Section: Introductionmentioning

confidence: 99%

Towards metamaterials with giant dielectric anisotropy via homogenization: An analytical study

Mackay

2015

Photonics and Nanostructures - Fundamentals and Applications

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A random mixture of two isotropic dielectric materials, one composed of oriented spheroidal particles of relative permittivity a and the other composed of oriented spheroidal particles of relative permittivity b , was considered in the long wavelength regime. The permittivity dyadic of the resulting homogenized composite material (HCM) was estimated using the Bruggeman homogenization formalism. The HCM was an orthorhombic biaxial material if the symmetry axes of the two populations of spheroids were mutually perpendicular and a uniaxial material if these two axes were mutually aligned. The degree of anisotropy of the HCM, as gauged by the ratio of the eigenvalues of the HCM's permittivity dyadic, increased as the shape of the constituent particles became more eccentric. The greatest degrees of HCM anisotropy were achieved for the limiting cases wherein the constituent particles were shaped as needles or discs. In these instances explicit formulas for the HCM anisotropy were derived from the dyadic Bruggeman equation. Using these formulas it was found that the degrees of HCM anisotropy are proportional to √ b or b , at fixed values of volume fraction and a , for b > a . Thus, in principle, metamaterials can be conceptualized via homogenization with extremely large degrees of anisotropy, by controlling the geometries and orientations of remarkably simple constituent particles. In practice, the degree of anisotropy would be limited by the available value of b (and/or a ).

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Section: Introductionmentioning

confidence: 99%

Towards metamaterials with giant dielectric anisotropy via homogenization: An analytical study

Mackay

2015

Photonics and Nanostructures - Fundamentals and Applications

View full text Add to dashboard Cite

show abstract

“…On such occasions we may turn to engineered composite materials. Rather exotic dielectric anisotropies have been central to recent developments involving nanostructured composite materials which support electromagnetic phenomenons such as negative refraction [3], optical cloaking [4], null reflection [5], and omnidirectional radiation [6], for examples. Most significantly, the incorporation of dielectric anisotropy can enable non-magnetic composite materials to support negative refraction [7,8].…”

Section: Introductionmentioning

confidence: 99%

Giant dielectric anisotropy via homogenization

Mackay

2014

Preprint

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A random mixture of two isotropic dielectric materials, one composed of oriented spheroidal particles of relative permittivity ǫ a and the other composed of oriented spheroidal particles of relative permittivity ǫ b , was considered in the long wavelength regime. The permittivity dyadic of the resulting homogenized composite material (HCM) was estimated using the Bruggeman homogenization formalism. The HCM was an orthorhombic biaxial material if the symmetry axes of the two populations of spheroids were mutually perpendicular and a uniaxial material if these two axes were mutually aligned. The degree of anisotropy of the HCM, as gauged by the ratio of the eigenvalues of the HCM's permittivity dyadic, increased as the shape of the constituent particles became more eccentric. The greatest degrees of HCM anisotropy were achieved for the limiting cases wherein the constituent particles were shaped as needles or discs. In these instances explicit formulas for the HCM anisotropy were derived from the dyadic Bruggeman equation. Using these formulas it was found that the degrees of HCM anisotropy are proportional to √ ǫ b or ǫ b , at fixed values of volume fraction and ǫ a , for ǫ b > ǫ a . Thus, in principle, there is no limit to degree of anisotropy that may be attained via homogenization. In practice, the degree of anisotropy would be limited by the available value of ǫ b (and/or ǫ a ).

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“…The propagation properties of TM and TE waves in isotropic materials are different from those propagating in anisotropic materials [18][19][20]. As a result, it is of practical significance to do some research on anisotropic electromagnetic artificial metamaterial [21]. In this paper, we investigate the propagation properties of TM and TE wave in a special anisotropic metamaterial structure.…”

Section: Introductionmentioning

confidence: 99%

The separation of TM and TE wave in multi-layer metamaterial structure

Xia

Wang

2014

Open Physics

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Abstract:A mixed-structure form of one-dimensional metamaterial structure composed of single negative permittivity material and anisotropic metamaterial has been investigated in this paper. Such a multi-layer metamaterial structure constitutes special resonant structures, which can be used to control wave propagation and realize the complete separation of TM and TE wave by choosing specific parameters. Theoretical analysis and numerical calculations have been performed to confirm the above results. Specifically, augments in incident angles of TM and TE waves make complete transmission frequencies right shift, and the thicknesses of this resonant structure determine propagation modes and propagation frequencies. PACS

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Zero reflection from layered anisotropic metamaterial structures

Cited by 5 publications

References 15 publications

Towards metamaterials with giant dielectric anisotropy via homogenization: An analytical study

Towards metamaterials with giant dielectric anisotropy via homogenization: An analytical study

Giant dielectric anisotropy via homogenization

The separation of TM and TE wave in multi-layer metamaterial structure

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