Helices of optimal shape for nonreflecting covering

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

doi:10.1051/epjap/2009149

Cited by 13 publications

(15 citation statements)

References 12 publications

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“…The alternative route to satisfy the polarizability balance η 0 α ee = α mm /η 0 of the metasurface unit cell in a wide frequency range is based on the use of bianisotropic inclusions constructed by a single metal wire [23], [24], [39]- [42]. In such inclusions, the induced electric and magnetic dipole moments are defined by the same current distribution (mode) along the wire.…”

Section: Metasurface Inclusionsmentioning

confidence: 99%

Planar Broadband Huygens’ Metasurfaces for Wave Manipulations

Cuesta

Faniayeu

Asadchy

et al. 2018

IEEE Trans. Antennas Propagat.

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Cuesta, F. S.; Faniayeu, I. A.; Asadchy, V. S.; Tretyakov, S. A. Planar broadband Huygens' metasurfaces for wave manipulationsAbstract-Electrically thin and effectively two-dimensional material composites, metasurfaces, have been widely exploited for manipulation of electromagnetic waves. For many applications it is desired to transform incident waves of a specific frequency range keeping the metasurface invisible at other frequencies.Such frequency-selective response can be achieved based on subwavelength Huygens' inclusions. However, their fabrication requires sophisticated processes due to the three-dimensional geometry. Here, we propose a planar Huygens' meta-atom with the goal to open a way to realize broadband invisible metasurfaces with topologies suitable for the conventional printed circuit board fabrication technology. We synthesize and analyse, both numerically and experimentally, three different metasurfaces capable of polarization and amplitude transformations of incident waves.

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Section: Metasurface Inclusionsmentioning

confidence: 99%

Planar Broadband Huygens’ Metasurfaces for Wave Manipulations

Cuesta

Faniayeu

Asadchy

et al. 2018

IEEE Trans. Antennas Propagat.

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“…where Z HFSS denotes the impedance parameter which the HFSS simulation computes and it is in the form of Z HFSS [output port i, output mode α, input port j, input mode β]. The 2×2 impedance matrix in (7) can also be diagonalized as,…”

Section: A Synthesis Of An Impedance-matched Cpssmentioning

confidence: 99%

“…where Z X n and Z Y n are the eigenvalues of the 2×2 impedance matrix in (7) and R is a square matrix whose columns are the linearly independent eigenvectors of the 2×2 impedance matrix. Physically speaking, R is a 2×2 rotational matrix and θ is the angle for which the whole layer is rotated by.…”

Section: A Synthesis Of An Impedance-matched Cpssmentioning

confidence: 99%

“…In this regard, recent years have witnessed a rapid development in the field of metasurfaces which are artificial EM surfaces comprising arrays of subwavelength-sized unit cells. By engineering the local interaction properties between the unit cells and an incident EM field, metasurfaces for various functionalities have been proposed to date [1][2][3][4][5][6][7][8]. For example, phasegradient metasurfaces have been demonstrated for functionalities such as light bending [1][2][3][4]9], holograms [10][11][12], and orbital angular momentum generation [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Design and Experimental Demonstration of Impedance-Matched Circular-Polarization-Selective Surfaces with Spin-Selective Phase Modulations

Kim

Eleftheriades

2020

Phys. Rev. Applied

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This paper presents the design and experimental demonstration of an impedance-matched circular polarization selective surface which also offers spin-selective phase modulations at microwave frequencies. We achieve this by leveraging the theory of Pancharatnam-Berry phase and cascading four tensor impedance layers, each comprising an array of crossed meander lines. These meander lines are precisely tuned and rotated to implement particular tensor surface impedance values to satisfy the impedance-matching condition for the transmitted right-handed circularly-polarized field while inducing Pancharatnam-Berry phase shift for the reflected left-handed circularly-polarized field. We present a detailed numerical synthesis technique to obtain the required impedance values for satisfying the impedance matching condition, and demonstrate spin-selective phase modulations based on Pancharatnam-Berry phase shifts. To verify the proposed idea, we experimentally demonstrate nearly-reflectionless transmission of right-handed circular polarization at broadside and reflection of left-handed circular polarization at 30 • off broadside at 12 GHz. For this purpose, a free-space quasi-optical set up and a near-field measurement system are respectively employed for measuring the transmitted and reflected circularly-polarized fields.

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“…The local electric dipole moment (or electric response) p − R V eηSldV and magnetic dipole moment m 1 2 R V r × jdV are connected by the condition jpj jmj∕c; here −e is the electron charge, η is the volume density of electrons, Sl is the electron displacement vector at location l, dV S ⊥ dl is the volume of an omega segment, with dl the length and S ⊥ πd 2 ∕4 the cross-section of the segment (d is the diameter of the wire), r is the radius-vector of the particle, j is the current density vector, and c is the speed of light. p and m are tuned by the shape of the omega particle and, in turn, create scattered electromagnetic radiation [11,[13][14][15].…”

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confidence: 99%

Ground-plane-less bidirectional terahertz absorber based on omega resonators

et al. 2015

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We present a new ultrathin metamaterial that acts as a frequency-selective absorber of terahertz radiation. The absorber is a square array of pairs of omega-shaped micro-resonators made of high-ohmic-loss metal. The metamaterial provides significant suppression of transmitted and reflected radiation in a bidirectional regime (that is, for both forward and backward propagating radiation). The absorber is efficient in a wide range of angles of incidence. The absence of a ground plane makes the absorber unique in comparison with numerous analogs with a ground plane that operate in a unidirectional regime. The novel metamaterial potentially enables controllable transmission of terahertz radiation in imaging systems. Analytical calculations as well as finite-element electromagnetic modeling are presented for an exemplary case with peak absorption at ∼3 THz.

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Helices of optimal shape for nonreflecting covering

Cited by 13 publications

References 12 publications

Planar Broadband Huygens’ Metasurfaces for Wave Manipulations

Planar Broadband Huygens’ Metasurfaces for Wave Manipulations

Design and Experimental Demonstration of Impedance-Matched Circular-Polarization-Selective Surfaces with Spin-Selective Phase Modulations

Ground-plane-less bidirectional terahertz absorber based on omega resonators

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