Complex-media electromagnetics and metamaterials

Tretyakov, Sergei

doi:10.1088/2040-8986/aa7956

Cited by 20 publications

(6 citation statements)

References 123 publications

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“…The properties of metamaterials are largely derived from the scattering properties of its constituents, the so called meta-atoms. The recent advances in the field of metamaterials has opened up many unprecedented means of light manipulation [ 1 , 2 , 3 , 4 , 5 , 6 ]. These advances were only possible thanks to meta-atoms that do not just show an electric but also a magnetic response [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Predicting Observable Quantities of Self-Assembled Metamaterials from the T-Matrix of Its Constituting Meta-Atom

Suryadharma

Rockstuhl

2018

Materials

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Self-assembled metamaterials attract considerable interest as they promise to make isotropic bulk metamaterials available at low costs. The optical response of self-assembled metamaterials is derived predominantly from the response of its individual constituents, i.e., the meta-atoms. Beyond effective properties, primary experimentally observable quantities, such as specific cross-sections, are at the focus of interest as they are frequently considered when exploiting metamaterials in specific applications. This posses the challenge of predicting these observable quantities for a diluted ensemble of randomly oriented meta-atoms. Thus far, this has been achieved by either averaging the optical response of the meta-atom across all possible incident fields or by restricting the consideration to only an electric and magnetic dipolar response. This, however, is either time-consuming or imposes an unnecessary limitation. Here, we solve this problem by deriving and presenting explicit expressions for experimentally observable quantities of metamaterials made from randomly arranged and oriented meta-atoms characterized by their T-matrix.

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Section: Introductionmentioning

confidence: 99%

Predicting Observable Quantities of Self-Assembled Metamaterials from the T-Matrix of Its Constituting Meta-Atom

Suryadharma

Rockstuhl

2018

Materials

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“…Following the procedure described in the previous section, we extracted the full impedance matrix (27×27), reducing it to its 3×3 equivalent (3). From this 3×3 system, we recovered the 2×2 impedance matrix applying the transformation described in (12).…”

Section: A Full-wave Simulations: Rlc Extractionmentioning

confidence: 99%

“…Their capability to show dielectric and magnetic properties not found in nature have been proved to be extremely useful in a number of different applications. In particular, they can provide negative values of dielectric permittivity and magnetic permeability, with isotropic or even anisotropic characteristics when properly designed [3]- [8]. The basic structure usually consists in a 2D or 3D array of resonant unit-cells; indeed, the resonant properties of the unit-D. Brizi and A. Monorchio are with the Department of Information Engineering, University of Pisa, Pisa, 56122, Italy (e-mail: danilo.brizi@ing.unipi.it, agostino.monorchio@unipi.it) and also with C.N.I.T., v. le Usberti 181/A, Parma, 43124, Italy.…”

Section: Introductionmentioning

confidence: 99%

An Accurate Equivalent Circuit Model of Metasurface-Based Wireless Power Transfer Systems

Brizi

Fontana

Barmada

et al. 2020

IEEE Open J. Antennas Propag.

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In this paper, we introduce a general analytical procedure to unambiguously characterize a metasurface through its lumped circuital equivalent in resonant inductive Wireless Power Transfer (WPT) applications. The proposed model incorporates the finite extent of the slab, as well as the WPT near field operative regime and the presence of the particular driving/receiving coils arrangement, providing quantitative and easy-to-handle parameters which can be manipulated to achieve WPT performance enhancement. We first develop the theoretical background aimed at the lumped parameters extraction, which reveals, for WPT applications, more accurate and robust with respect to the conventional sub-wavelength homogenization theories based on infinite slab extent and impinging plane wave hypotheses. We provide some general guidelines for the design of metasurfaces for WPT performance enhancement based on the derived circuit model; afterwards, we numerically design a testcase consisting of two resonant coils (driver and receiver, respectively) with an interposed passive metasurface to verify the developed theory. Finally, we show some measurements performed on a fabricated prototype, that present an overall excellent agreement with both the lumped model and the numerical simulations.

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“…An analytical solution of the polarisability coefficients exists for several simple cases by solving Laplace equation of a single element in free space. During the years, people have shown interest in more complex geometries, such as chiral and omega particles which yield bianisotropic effects [8][9].…”

Section: Introductionmentioning

confidence: 99%

Effective electrical parameters evaluation for non‐dispersive metamaterials with highly interaction fields

Firestein

Shavit

2019

IET Microwaves, Antennas & Propagation

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Here, the authors apply Lorenz–Lorentz and Maxwell Garnett homogenisation theory in order to extract the effective constitutive parameters of a metamaterial. The authors demonstrate the significance of extracting the polarisability coefficients of a metamaterial taking in consideration the interaction fields of a unit cell neighbours in an infinite periodic structure. The validation process is done using full wave analysis by comparing reflection and transmission coefficients of the periodic structure to the results from a bulk characterised by the extracted electrical effective parameters. The presented method helped us to evaluate the effective parameters of non‐dispersive metamaterials with highly interaction fields. In addition, several new geometries of metamaterials that are characterised by unique non‐dispersive diagonal ϵfalse¯¯ and italicμfalse¯¯ are presented.

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Complex-media electromagnetics and metamaterials

Cited by 20 publications

References 123 publications

Predicting Observable Quantities of Self-Assembled Metamaterials from the T-Matrix of Its Constituting Meta-Atom

Predicting Observable Quantities of Self-Assembled Metamaterials from the T-Matrix of Its Constituting Meta-Atom

An Accurate Equivalent Circuit Model of Metasurface-Based Wireless Power Transfer Systems

Effective electrical parameters evaluation for non‐dispersive metamaterials with highly interaction fields

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