Electromagnetic characterization of substrated metasurfaces

With recent advances in nanophotonics and nanofabrication, considerable progress has been achieved in realizations of thin composite layers designed for full absorption of incident electromagnetic radiation, from microwaves to the visible. If the layer is structured at a subwavelength scale, thin perfect absorbers are usually called "metamaterial absorbers," because these composite structures are designed to emulate some material responses not reachable with any natural material. On the other hand, many thin absorbing composite layers were designed and used already in the time of the introduction of radar technology, predominantly as a means to reduce radar visibility of targets. In view of a wide variety of classical and new topologies of optically thin metamaterial absorbers and plurality of applications, there is a need for a general, conceptual overview of the fundamental mechanisms of full absorption of light or microwave radiation in thin layers. Here, we present such an overview in the form of a general theory of thin perfectly absorbing layers. Possible topologies of perfect metamaterial absorbers are classified based on their fundamental operational principles. For each of the identified classes, we provide design equations and give examples of particular realizations. The concluding section provides a summary and gives an outlook on future developments in this field.

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“…In the presence of SIB the array of plasmonic nanoparticles is fully equivalent to an array of omega particles [129]. In Ref.…”

Section: Metamaterials Absorber Based On the Effect Of Substrate-inducmentioning

confidence: 99%

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

2015

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“…Finally, for comparisons with the technique of [18], [22], the required diagonal terms of [χ] are extracted from the simulated R and T coefficients for the normal and an oblique (here θ = 45 • ) incidence. Although these susceptibilities are by definition independent of the incident wave characteristics, their values are strongly affected by the accuracy of the simulations, as they are prone to computational errors [31]. It is mentioned that the choice of θ = 45 • has been found to be the optimal one for the prediction of the scattering parameters at different incidence angles with the highest possible accuracy.…”

Section: Numerical Validationmentioning

confidence: 99%

“…This resonance corresponds to the first Bragg resonance of the structure. Observe that the technique of [18], [22] does not provide an exact characterization of the metasurface's response for frequencies away from the resonances, possibly due to its sensitivity to computational errors [31].…”

Section: A Planar Resonatorsmentioning

confidence: 99%

Surface Susceptibility Bianisotropic Matrix Model for Periodic Metasurfaces of Uniaxially Mono-Anisotropic Scatterers Under Oblique TE-Wave Incidence

Dimitriadis

Sounas

Kantartzis

et al. 2012

IEEE Trans. Antennas Propagat.

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A bianisotropic matrix technique is presented for the development of a homogenized surface susceptibility model of metasurfaces with arbitrary uniaxially mono-anisotropic scatterers, illuminated by obliquely incident TE waves. Based on the sole assumption that the scatterers can be described by pointdipoles, the proposed formulation establishes a simple relation between the homogenized metasurface susceptibility matrix and the scatterer polarizability matrix. For this purpose, the exact interaction coefficients, associating the metasurface local field vectors with the dipole moment vectors, are extracted in terms of rapidly convergent series. The resulting analytical expressions for the interaction coefficients are applicable to both near-field and far-field problems. Moreover, the derived formula for the surface susceptibility matrix reveals the existence of off-diagonal terms, corresponding to a magnetoelectric coupling effect at the lattice level. The accuracy of the method is verified via comparisons with full-wave-simulation results for several metasurfaces of planar resonators and magnetodielectric spheres. It is observed that the efficiency of the model is contingent upon the electrical size of the scatterers rather than the lattice periodicity, since the former determines the validity of the point-dipole approximation, which is the only assumption throughout the analysis.

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“…[10] (for the oblique incidence in absence of bianisotropy) and Ref. [64] (for the bianisotropic case). Furthermore, other sophisticated approaches, taking into account Green's dyadic and leading to the same results for bianisotropic planar arrays, were reported in Refs.…”

Section: Modeling a Cut-plate Pair Metasurfacementioning

confidence: 99%

Extreme coupling: A route towards local magnetic metamaterials

et al. 2014

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Genuinely homogeneous metamaterials, which may be characterized by local effective constitutive relations, are required for many spectacular metamaterial applications. Such metamaterials have to be made of meta-atoms, i.e., subwavelength resonators, which exhibit only electric and or magnetic dipole and negligible higher-order multipolar polarizabilities in the spectral range of interest. Here, we show that these desired meta-atoms can be designed by exploiting the extreme coupling regime. Appropriate meta-atoms are identified by performing a multipole analysis of the field scattered from the respective meta-atom. To design those particular meta-atoms it is important to disclose the frequency and angular-dependent polarizability of both dipole moments. We demonstrate the applicability of a purely analytical model to accurately calculate for a normally incident plane wave reflection and transmission from meta-surfaces made of periodically arranged meta-atoms. With our work we identify a possible route towards the engineering of artificial materials while only considering the response from its constituents. Our approach is generally applicable to all spectral domains and can be used to evaluate and design metamaterials made from different constituting materials, e.g., metals, dielectrics, or semiconductors.

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Electromagnetic characterization of substrated metasurfaces

Cited by 61 publications

References 29 publications

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

Surface Susceptibility Bianisotropic Matrix Model for Periodic Metasurfaces of Uniaxially Mono-Anisotropic Scatterers Under Oblique TE-Wave Incidence

Extreme coupling: A route towards local magnetic metamaterials

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