Coupling Effect for Dielectric Metamaterial Dimer

Zhang, Fuli; Sadaune, Véronique; Kang, Lei; Zhao, Qian; Zhou, Ji; Lippens, D.

doi:10.2528/pier12081304

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…In the following, we report on the mode coupling effect which plays a dominant role in the electromagnetic properties of metamaterials [33][34][35][36], notably, in the achievement of negative effective index. Magnetic and electric mode coupling effects in ADMs have been separately studied from each other in the microwave by Zhang et al [34].…”

Section: Introductionmentioning

confidence: 99%

Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies

Akmansoy

Marcellin

2018

EPJ Appl. Metamat.

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We report on the role of the coupling of the modes of Mie resonances in all-dielectric metamaterials to ensure negative effective index at terahertz frequencies.We study this role according to the lattice period and according to the frequency overlapping of the modes of resonance. We show that negative effective refractive index requires sufficiently strong mode coupling and that for even more strong mode coupling, the first two modes of Mie resonances are degenerated; the effective refractive index is then undeterminded. We also show that adjusting the mode coupling leads to near-zero effective index, or even null effective index. Further, we compare the mode coupling effect with hybridization in metamaterials.

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Section: Introductionmentioning

confidence: 99%

Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies

Akmansoy

Marcellin

2018

EPJ Appl. Metamat.

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“…The use of plasmonic or dielectric nanoparticle oligomers (Campione, Adams, et al, 2013 andCampione, Guclu, et al, 2013;Campione et al, 2014;Chong et al, 2014;Shafiei et al, 2013;Vallecchi et al, 2010), e.g., dimers, trimers, circular nanoclusters, etc., for realizing field hot spots useful for surface-enhanced Raman spectroscopy or the design of Fano resonant structures with enhanced fields were proposed in the literature. Very recently, the formation of electric and magnetic near-field hot spots in dimers of dielectric resonators has attracted a great deal of attention (Bakker et al, 2015;Boudarham et al, 2014;Mirzaei & Miroshnichenko, 2015;Yan et al, 2015;Zhang et al, 2012;Zywietz et al, 2015). Though electric resonance analyses were reported in Vallecchi et al (2010) for the case of plasmonic nanoshells, the analytical analysis of the electric and magnetic resonances that can be observed in dielectric dimers depending on the excitation direction, e.g., parallel or orthogonal to the dimer axis, has not been fully reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Dipole Approximation to Predict the Resonances of Dimers Composed of Dielectric Resonators for Directional Emission

2017

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In this paper we develop a fully retarded, dipole approximation model to estimate the effective polarizabilities of a dimer made of dielectric resonators. They are computed from the polarizabilities of the two resonators composing the dimer. We analyze the situation of full cubes as well as split cubes, which have been shown to exhibit overlapping electric and magnetic resonances. We compare the effective dimer polarizabilities to ones retrieved via full‐wave simulations as well as ones computed via a quasi‐static, dipole approximation. We observe good agreement between the fully retarded solution and the full‐wave results, whereas the quasi‐static approximation is less accurate for the problem at hand. The developed model can be used to predict the electric and magnetic resonances of a dimer under parallel or orthogonal (to the dimer axis) excitation. This is particularly helpful when interested in locating frequencies at which the dimer will emit directional radiation.

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“…This study concerns the estimation of the effective constitutive parameters of particulate composite materials, wherein two of the component materials are jointly present as dimers. Previously this topic has been investigated using Mie scattering theory [9], a Brownian-motion formulation [10], numerical methods such as the finite element method [2], and quantum-mechanical methods based on density function theory [4,8]. In contrast, the theoretical approaches taken herein are simpler, being based on the well-established homogenization formalisms named after Bruggeman and Maxwell Garnett [11,12].…”

Section: Introductionmentioning

confidence: 99%

Application of Bruggeman and Maxwell Garnett homogenization formalisms to random composite materials containing dimers

Mackay

Lakhtakia

2015

Waves in Random and Complex Media

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The homogenization of a composite material comprising three isotropic dielectric materials was investigated. The component materials were randomly distributed as spherical particles, with the particles of two of the component materials being coupled to form dimers. The Bruggeman and Maxwell Garnett formalisms were developed to estimate the permittivity dyadic of the homogenized composite material (HCM), under the quasi-electrostatic approximation. Both randomly oriented and identically oriented dimers were accommodated; in the former case the HCM is isotropic, whereas in the latter case the HCM is uniaxial. Representative numerical results for composite materials containing dielectric-dielectric dimers demonstrate close agreement between the estimates delivered by the Bruggeman and Maxwell Garnett formalisms. For composite materials containing metaldielectric dimers and metal-metal dimers with moderate degrees of dissipation, the estimates of the two formalisms are in broad agreement, provided that the dimer volume fractions are relatively low. In general, the effects of intradimer coupling on the estimates of the HCM's permittivity are relatively modest but not insignificant, these effects being pronounced by anisotropy when all dimers are identically oriented.

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Coupling Effect for Dielectric Metamaterial Dimer

Cited by 16 publications

References 42 publications

Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies

Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies

Dipole Approximation to Predict the Resonances of Dimers Composed of Dielectric Resonators for Directional Emission

Application of Bruggeman and Maxwell Garnett homogenization formalisms to random composite materials containing dimers

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