Coated nonmagnetic spheres with a negative index of refraction at infrared frequencies

Wheeler, Mark S.; Aitchison, J. S.; Mojahedi, Mo

doi:10.1103/physrevb.73.045105

Cited by 192 publications

(151 citation statements)

References 22 publications

(37 reference statements)

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“…In a three dimensional array of particles with volume densityÑ , the effective permittivity ε eff r and permeability µ eff r can be obtained from (12a) and (12b) [19]. These relations reflect the first scattered electric and magnetic dipole sources of array particle, i.e., terms with a coefficients, to the constitutive constants of the bulk medium.…”

Section: Effective Medium For the Arraymentioning

confidence: 99%

Dispersion Diagram Analysis of Arrays of Multishell Multimaterial Nanospheres

Rostami¹,

Beig²,

Mosallaei³

2013

PIER B

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Abstract-In this paper, the characteristics of electromagnetic waves supported by three dimensional (3-D) periodic arrays of multilayer multimaterial spheres are theoretically investigated. The spherical particles have the potential to offer electric and magnetic dipole modes, where their novel arrangements engineer the desired metamaterial performance. Multilayer spheres are designed for controlling both electric and magnetic Mie scattering resonances around the same spectrum. A full wave spherical modal formulation is applied to express the electromagnetic fields in terms of the electric and magnetic multipole modes. Imposing boundary conditions will determine the required equations for obtaining dispersion characteristics ωa/2πc − ka/2π. A metamaterial constructed from unit-cells of multilayer multimaterial sphere is created. It is demonstrated such compositions can exhibit negative-slope dispersion diagram metamaterial properties in frequency spectrums of interest, where both electric and magnetic Mie scattering resonances occur. Different coatings such as silver, gold, indium-tin-oxide (ITO), Al : ZnO, (AZO) and Ga : ZnO (GZO) are used and the operating range and the losses of the resulting metamaterials are compared. It is presented that by adding the third layer to the core-shell structure, due to increased degrees of freedom, the metamaterials operation range will be tunable to the desired frequency.

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Section: Effective Medium For the Arraymentioning

confidence: 99%

Dispersion Diagram Analysis of Arrays of Multishell Multimaterial Nanospheres

Rostami¹,

Beig²,

Mosallaei³

2013

PIER B

View full text Add to dashboard Cite

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“…Later, Wheeler et al [27] also proposed a core-cell structure, with a LiTaO 3 sphere core and a coating on its surface whose dispersion relation follows the Drude model. Using this structure they achieved an isotropic LHM in far infrared region.…”

Section: Abnormal Em Media Composed Of Highpermittivity Particles Basmentioning

confidence: 99%

Intrinsic abnormal electromagnetic medium based on polar lattice vibration

2011

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A new class of media with abnormal electromagnetic parameters has been attracting increasing attention because of its exotic properties and potential application. Currently, typical metamaterials are mainly composed of artificially designed metallic periodic structures. However, due to the limitations of available fabrication technologies, physical size and material effects, it is difficult to realize these abnormal properties by these artificial structures in the high-frequency regime. Therefore, it is important to find materials with intrinsic abnormal electromagnetic responses. In this field, a new mechanism based on the interaction between polar lattice vibrations and electromagnetic waves has been proposed. In this paper, we review progress in this field. abnormal electromagnetic medium, polar lattice vibration, intrinsic property, infrared, indefinite medium Citation:Wang R, Zhou J, Qiu X G. Intrinsic abnormal electromagnetic medium based on polar lattice vibration. Chinese Sci Bull, 2011Bull, , 56: 1318Bull, −1324Bull, , doi: 10.1007 Abnormal electromagnetic (EM) medium refer to a kind of material system with abnormal permittivity and permeability (negative or less than unity), which is typically represented by left handed material (LHM) with negative permittivity and permeability at the same time. Abnormal EM medium is normally realized via metamaterials based on metallic periodic structures [1][2][3][4][5][6][7][8][9][10][11][12]. The abnormal properties in the metamaterial usually originate from the artificial structure, and not from the materials themselves. These materials attracted much attention not only because of their scientific significance, but also their potential for enlargement of the performance scale, and design of new functional materials. Conventional metamaterials are based on highly engineered artificial structure units, normally with electric or magnetic resonances, such as wires and split ring resonators (SRRs) [2,[4][5][6][7][8][9]. In the infrared and optical regions, metamaterials are showing more and more shortcomings for the current fabrication technologies, characteristic physical size and material effects of metals in mesoscopic scale. However, intrinsic EM responses in nature existed materials provide another choice. For example, ferromagnetic resonances in ferrites can provide tunable negative permeability at microwave frequency [16][17][18], and the electric resonance in ferroelectric can be used to achieve a negative permittivity [19,20]. However, because of their high frequency cutoffs, these EM resonances cannot be extended to the infrared or optical regions, restricting the development of intrinsic abnormal media. Therefore, it is a challenging problem to realize intrinsic abnormal EM properties in the high frequency regime. Recently, abnormal EM media based on polar lattice vibrations in the infrared region have attracted

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“…However, the paper of Lewin [16] from 1947 is nowadays much better known. Since then, many others have followed this approach [17][18][19][20][21][22][23][24][25][26]. Using only isotropic dielectric spheres, the DNG condition is very difficult to achieve.…”

Section: Introductionmentioning

confidence: 99%

“…Using only isotropic dielectric spheres, the DNG condition is very difficult to achieve. Therefore, different authors have considered, e.g., magnetodielectric spheres [19], spheres of two different sizes [22,23] and layered structures [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Tailoring Effective Media by Mie Resonances of Radially-Anisotropic Cylinders

2015

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This paper studies constructing advanced effective materials using arrays of circular radially-anisotropic (RA) cylinders. Homogenization of such cylinders is considered in an electrodynamic case based on Mie scattering theory. The homogenization procedure consists of two steps. First, we present an effectively isotropic model for individual cylinders, and second, we discuss the modeling of a lattice of RA cylinders. Radial anisotropy brings us extra parameters, which makes it possible to adjust the desired effective response for a fixed frequency. The analysis still remains simple enough, enabling a derivation of analytical design equations. The considered applications include generating artificial magnetism using all-dielectric cylinders, which is currently a very sought-after phenomenon in optical frequencies. We also study how negative refraction is achieved using magnetodielectric RA cylinders.

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Coated nonmagnetic spheres with a negative index of refraction at infrared frequencies

Cited by 192 publications

References 22 publications

Dispersion Diagram Analysis of Arrays of Multishell Multimaterial Nanospheres

Dispersion Diagram Analysis of Arrays of Multishell Multimaterial Nanospheres

Intrinsic abnormal electromagnetic medium based on polar lattice vibration

Tailoring Effective Media by Mie Resonances of Radially-Anisotropic Cylinders

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