Optimal arrangement of smooth helices in uniaxial 2D-arrays

Asadchy, Viktar; Faniayeu, Ihar; Ra’di, Younes; Semchenko, I. V.; Khakhomov, Sergei

doi:10.1109/metamaterials.2013.6809014

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…An optimal arrangement of helices in the array was considered in Ref. [38] and depicted in Although such periodicity is not truly subwavelength, the arrays are in fact metasurfaces since they can be homogenized. Numerical simulations show that the amplitudes of the Floquet modes that become propagating for oblique illumination of the arrays are negligible compared to that of the fundamental harmonic.…”

Section: Total Absorption In An Array Of Helicesmentioning

confidence: 99%

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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Section: Total Absorption In An Array Of Helicesmentioning

confidence: 99%

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

et al. 2015

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“…To ensure uniaxial symmetry, the unit cell should contain helices oriented in two orthogonal directions in the metasurface plane. We utilize the arrangement of helices proposed in [6], [33] and shown in Fig. 4a.…”

Section: Transmitarraysmentioning

confidence: 99%

Multifunctional Cascaded Metamaterials: Integrated Transmitarrays

Elsakka

Asadchy

Faniayeu

et al. 2016

IEEE Trans. Antennas Propagat.

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Control of electromagnetic waves using engineered materials is very important in a wide range of applications, therefore there is always a continuous need for new and more efficient solutions. Known natural and artificial materials and surfaces provide a particular functionality in the frequency range they operate but cast a "shadow" and produce reflections at other frequencies. Here, we introduce a concept of multifunctional engineered materials that possess different predetermined functionalities at different frequencies. Such response can be accomplished by cascading metasurfaces (thin composite layers) that are designed to perform a single operation at the desired frequency and are transparent elsewhere. Previously, out-of-band transparent metasurfaces for control over reflection and absorption were proposed. In this paper, to complete the full set of functionalities for wave control, we synthesize transmitarrays that tailor transmission in a desired way, being "invisible" beyond the operational band. The designed transmitarrays for wavefront shaping and anomalous refraction are tested numerically and experimentally. To demonstrate our concept of multifunctional engineered materials, we have designed a cascade of three metasurfaces that performs three different functions for waves at different frequencies. Remarkably, applied to volumetric metamaterials, our concept can enable a single composite possessing desired multifunctional response.Comment: 9 pages, 9 figures, journal pape

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“…1a in blue and red, respectively). The certain arrangement of the helices in the array was considered in [3]. Equal electric and magnetic responses can be accomplished in the helical inclusions with equal electric and magnetic polarizabilities.…”

Section: Realization Of a Single-layer Meta-atom Absorbermentioning

confidence: 99%

“…The induced electric and magnetic dipole moments in the inclusions under illumination do not scatter in backward direction but in forward direction they radiate secondary plane waves destructively interfering with incident ones (providing zero transmission) [2]. The equal electric and magnetic properties are achieved due to optimal shape of the inclusions and their certain arrangement in the array [3]. The realized absorber demonstrates highly efficient performance and operates symmetrically for incident waves from the two sides.…”

Section: Introductionmentioning

confidence: 99%

A single-layer meta-atom absorber

Faniayeu

Asadchy

Dzerzhauskaya

et al. 2014

2014 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics

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We realized and experimentally tested a conceptually new kind of electrically thin absorbers of electromagnetic waves. The idea is to utilize a single layer of precisely designed meta-atoms. This allows one to design an absorber with unprecedentedly small thickness. The absorber implies absence of a ground plane. High efficiency of the realized structure in the S band is demonstrated. The conceptual idea of the proposed absorber can find many applications especially at optical frequencies.

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Optimal arrangement of smooth helices in uniaxial 2D-arrays

Cited by 9 publications

References 7 publications

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Multifunctional Cascaded Metamaterials: Integrated Transmitarrays

A single-layer meta-atom absorber

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