A Negative Refractive Index Metamaterial Based on a Cubic Array of Layered Nonmagnetic Spherical Particles

Kuester, Edward F.; Memic, Nadja; Shen, Simone; Scher, Aaron D.; Kim, Sung Hoon; Kumley, Kendra L.; Loui, Hung

doi:10.2528/pierb11042206

Cited by 30 publications

(39 citation statements)

References 56 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These can be used in (5) and (6) to yield a model similar as the Maxwell-Garnett model for the nude sphere. Full details can be found in [17]. See also [28] and [29], from which it can be seen that indeed the same results are obtained.…”

Section: Array Of Coated Spheressupporting

confidence: 69%

“…The CST results yield an attenuation constant (defined as in [17]) of α = 1.12 dB/λ at 1.35 GHz. This is a really low value very competitive with the values found in the overview Table 1 in [17].…”

Section: Coated Spheresmentioning

confidence: 99%

“…Wheeler et al (2006) [15] and Basilio et al (2012) [16] simplified things and used spheres of the same size only to realize NRI. Kuester et al [17] obtained an NRI bandwidth of ca. 10% by using layered dielectric spheres while considering realistic losses.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Increasing the Nri Bandwidth of Dielectric Sphere-Based Metamaterials by Coating

Yan¹,

Vandenbosch²

2012

PIER

View full text Add to dashboard Cite

Abstract-A new metamaterial topology is proposed, based on dielectric coated spheres. The effect of the coating is an increased negative permittivity and permeability bandwidth compared with the non-coated spheres. The influence of the dimensional parameters is analyzed, and the relation of each of them with the bandwidth is studied. The theoretical results are confirmed by full wave simulations using CST. A combination of the new topology with wires is used to reach an NRI bandwidth of about 23%. To the knowledge of the authors, to date this is one of the highest bandwidths reported in literature.

show abstract

Section: Array Of Coated Spheressupporting

confidence: 69%

Section: Coated Spheresmentioning

confidence: 99%

See 1 more Smart Citation

Increasing the Nri Bandwidth of Dielectric Sphere-Based Metamaterials by Coating

Yan¹,

Vandenbosch²

2012

PIER

View full text Add to dashboard Cite

show abstract

“…Second, the wavelength in the effective medium is assumed to be much larger than the spheres (i.e., kr j << 1). In this case, the RiccatiBessel functions can be replaced by their small-argument approximations and the electric and magnetic dipole Mie scattering coefficients reduce to [27,35] …”

mentioning

confidence: 99%

“…The forward scattering amplitude, in turn, is related to electric and magnetic multipole Mie scattering coefficients, a n,j and b n,j by [34,35] …”

mentioning

confidence: 99%

Negative refractive index induced by percolation in disordered metamaterials

Slovick

2017

Phys. Rev. B

View full text Add to dashboard Cite

An effective medium model is developed for disordered metamaterials containing a spatially random distribution of dielectric spheres. Similar to effective medium models for ordered metamaterials, this model predicts resonances in the effective permeability and permittivity arising from electricand magnetic-dipole Mie resonances in the spheres. In addition, the model predicts a redshift of the electric resonance with increasing particle loading. Interestingly, when the particle loading exceeds the percolation threshold of 33%, the model predicts that the electric resonance overlaps with the magnetic resonance, resulting in a negative refractive index.Metamaterials, inhomogeneous composite materials that behave macroscopically as homogeneous materials, are of great fundamental and technological interest. The ability to tailor the macroscopic electromagnetic parameters, namely the permittivity and permeability, by changing the geometry and arrangement of the included elements has led to a number of important material designs and applications [1]. Most notable among these are materials with negative refractive index [2,3], which have both negative permittivity and permeability. Negative index materials exhibit unusual properties such as negative refraction and exponential growth of evanescent near fields, which have been utilized for applications such as cloaking [4] and superresolution imaging [5].To date, the metamaterial literature has focused primarily on designs where the included elements are arranged in a periodic lattice [6]. This is largely due to the ease of computation and suppression of scattering, as disorder of the lattice leads to spatial inhomogeneities. However, fabrication of periodic metamaterials on a large scale can be cost prohibitive, particularly for metamaterials operating in the optical band, where the lattice dimensions are submicron and require the use of electronbeam lithography [7,8]. Self-assembly based nanosphere lithography has been used to fabricate centimeter-scale optical metasurfaces [9], but this approach is not scalable to much larger areas.Disordered metamaterials provide a scalable alternative to periodic structures, provided that the scattering can be managed and their performance can be predicted. However, relatively few works have focused on disordered metamaterials. These limited studies have shown that size [10-13] and positional [14-23] disorder of a metamaterial's resonator elements lead to resonance broadening and effective scattering loss. While these works provide important insights, they overlook one of the most important aspects of disorder: percolation. Percolation occurs in random composites at high loading when the particles form a continuous path through the composite, and it can have dramatic consequences on the effective electromagnetic parameters [24,25] In this Letter, it is shown that percolation induces a negative refractive index in disordered metamaterials containing Mie-resonant particles. To this end, the classic Bruggeman percolation theory [24,26] ...

show abstract

Theoretical Models of Metamaterial

Munir,

Kashaf

2023

Electromagnetic Metamaterials

View full text Add to dashboard Cite

A Negative Refractive Index Metamaterial Based on a Cubic Array of Layered Nonmagnetic Spherical Particles

Cited by 30 publications

References 56 publications

Increasing the Nri Bandwidth of Dielectric Sphere-Based Metamaterials by Coating

Increasing the Nri Bandwidth of Dielectric Sphere-Based Metamaterials by Coating

Negative refractive index induced by percolation in disordered metamaterials

Theoretical Models of Metamaterial

Contact Info

Product

Resources

About