Optimal helix shape: Equality of dielectric, magnetic, and chiral susceptibilities

Semchenko, I. V.; Khakhomov, Sergei; Samofalov, A. L.

doi:10.1007/s11182-009-9249-9

Cited by 23 publications

(31 citation statements)

References 5 publications

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“…Using analytical expressions [12,31,37] and the method for extracting polarizabilities introduced in Ref. [39], we have optimized the dimensions of the inclusions.…”

Section: Total Absorption In An Array Of Helicesmentioning

confidence: 99%

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Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

et al. 2015

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Energy of propagating electromagnetic waves can be fully absorbed in a thin lossy layer, but only in a narrow frequency band, as follows from the causality principle. On the other hand, it appears that there are no fundamental limitations on broadband matching of thin resonant absorbing layers. However, known thin absorbers produce significant reflections outside of the resonant absorption band. In this paper, we explore possibilities to realize a thin absorbing layer that produces no reflected waves in a very wide frequency range, while the transmission coefficient has a narrow peak of full absorption. Here we show, both theoretically and experimentally, that a thin resonant absorber, invisible in reflection in a very wide frequency range, can be realized if one and the same resonant mode of the absorbing array unit cells is utilized to create both electric and magnetic responses. We test this concept using chiral particles in each unit cell, arranged in a periodic planar racemic array, utilizing chirality coupling in each unit cell but compensating the field coupling at the macroscopic level. We prove that the concept and the proposed realization approach also can be used to create nonreflecting layers for full control of transmitted fields. Our results can have a broad range of potential applications over the entire electromagnetic spectrum including, for example, perfect ultracompact wave filters and selective multifrequency sensors.

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“…Using analytical expressions [12,31,37] and the method for extracting polarizabilities introduced in Ref. [39], we have optimized the dimensions of the inclusions.…”

Section: Total Absorption In An Array Of Helicesmentioning

confidence: 99%

“…Pioneering topologies of Huygens' inclusions were introduced in Refs. [9][10][11][12]. Subsequently, Huygens' inclusions of different topologies have been used as structural elements in sheets to control transmission wave fronts [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

et al. 2015

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“…Optimal helices, introduced and studied in Refs. [8][9][10][12][13][14][15][16][17][18], interact only with waves of one of the two orthogonal circular polarizations. The geometrical parameters of such helices are known.…”

Section: A Lossless Compositesmentioning

confidence: 99%

“…In that paper, "maximum chirality" corresponds to the optimal helices, introduced and studied in Refs. [12][13][14][15][16][17][18], that is, to helices which interact only with waves of one of the two orthogonal polarizations. However, the present results show that extreme chirality can be possibly defined based on other criteria: maximally strong interaction with one of the CP modes or maximum difference of reactive energies of an object in the field of right-or left-hand polarized waves.…”

Section: Numerical Examplesmentioning

confidence: 99%

Stored and absorbed energy of fields in lossy chiral single-component metamaterials

et al. 2018

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Here we present theoretical results for estimation of electromagnetic field energy density and absorbed energy in dispersive lossy chiral single-component metamaterials which consist of an ensemble of identical helical resonators as inclusions. The shape of the helical resonator can vary over a wide range, from a straight wire to a flat split ring. An interaction of the inclusions with harmonic circularly polarized electromagnetic plane waves is studied. We focus on how the inclusion shape influences the mentioned metamaterial properties. The derived general solution for the problem is in good agreement with previous partial and alternative solutions obtained for split ring resonators, straight wires, and helices. The study reveals the optimal geometry of helical lossy resonators for their strongest selectivity of interaction with circularly polarized radiation.

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“…They store maximum (or minimum, equal to zero) reactive energy in given fields [2], they are ''invisible'' for certain excitations [3], they present the optimal configurations for extracting energy from external fields [4]. Planar arrays of balanced particles realize optimal configurations for polarization transformers [5][6][7] or reflectors with controllable reflection phase [8].…”

Section: Introductionmentioning

confidence: 99%

The potential energy of non-resonant optimal bianisotropic particles in an electromagnetic field does not depend on time

et al. 2014

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-In this work, we consider potential energy of recently conceptualized optimal (balanced) bianisotropic particles in electromagnetic fields. The case of non-resonant lossless particles is studied. Knowing the potential energy of optimal bianisotropic particles in the fields of the respective excitations, we find the acting force on the particle in inhomogeneous external fields. It is found that for optimal particles with the balanced values of the polarizabilities the potential energy and acting force are time independent.

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Optimal helix shape: Equality of dielectric, magnetic, and chiral susceptibilities

Cited by 23 publications

References 5 publications

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Stored and absorbed energy of fields in lossy chiral single-component metamaterials

The potential energy of non-resonant optimal bianisotropic particles in an electromagnetic field does not depend on time

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