Asymmetric chiral metamaterial circular polarizer based on twisted split-ring resonator

Cheng, Yong; Nie, Yan; Cheng, Zheng Ze; Wang, Xian; Gong, Rongzhou

doi:10.1007/s00340-013-5659-z

Cited by 31 publications

(32 citation statements)

References 30 publications

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“…Surface current distributions are studied in the unit-cell of CMMs to observe the coupling between the electric and magnetic fields, as shown in Figures 7(a), (b) and (c). From Figures 7(a) and (b), similar to the results of [15,28], the currents on the front and back SRRs are in the same direction at the first frequency (5.36 GHz), and the antiparallel current exists on the top and bottom layers of the structure at the second frequency (6.65 GHz), which are symmetric resonance mode as coupled electric dipoles resonance and asymmetric resonance mode as coupled magnetic dipoles, respectively. Thus, the fundamental electric resonance mode of the first SRR can be excited efficiently, and the near-field coupling between the first and second SRRs results in a emitted RCP and LCP wave at resonances, respectively.…”

Section: Resultssupporting

confidence: 65%

“…Four different linear transmission coefficients could be obtained by rotating the received antennae. Then the linear-to-circular and circular-to-circular transmission coefficients can be calculated from the transformation equations described in [25,27,28] in detail.…”

Section: Physical Model Simulation and Experimentsmentioning

confidence: 99%

“…CMMs are of great current interest both for customized functionalities and for potential applications not found in natural medium arise from the magneto-electric cross coupling of chiral structures due to their lack of any mirror symmetry. As a fact, besides negative refractive index, CMMs can also achieve other exotic EM characteristics, such as giant gyrotropy [4], strong polarization rotation (giant optical activity) [5][6][7][8][9][10][11], circular polarizer (circular dichroism, CD effect) [12][13][14][15], asymmetric transmission (AT) effect [16][17][18][19][20][21], linear or/to circular polarization conversion [22][23][24][25][26][27][28][29][30][31][32], and even the prospect of a repulsive Casimir force [33,34] by special enantiomeric forms or similar chiral structure design. The cross-coupling is original physics of these special electromagnetic (EM) properties [35,36].…”

Section: Introductionmentioning

confidence: 99%

“…Compared with conventional media or method [38,39], CMMs has some advantages to realize the manipulating polarization, such as high polarization conversion efficiency and operation frequency can be scaled to different EM spectrum due to the geometry scalability. Based on this, there have been many efforts tending toward the realization of the CMMs in manipulating the polarization states of EM wave [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a set of circular polarizers (giant CD effect) [12][13][14][15][22][23][24][25][26][27][28][29][30][31][32] and pure linear polarization rotators or transformers with AT effect [16][17][18][19][20][21] using helix structure, asymmetric U-shaped SRR pair, planar spiral structure, and twisted split ring resonators (SRRs), more concentric rings and other asymmetric chiral structures have been intensively reported. Among them, all these chiral structures could be available to tailor the cross coupling between electric and magnetic fields, which can achieve a giant CD effect or optical activity or circular conversion dichroism.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Band Circular Polarizer and Linear Polarization Transformer Based on Twisted Split-Ring Structure Asymmetric Chiral Metamaterial

Cheng

Nie²,

Cheng³

et al. 2014

PIER

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Abstract-In this paper, a bi-layer twisted split-ring structure asymmetric chiral metamaterial was proposed, which could achieve circularly polarized (giant circular dichroism effect) wave with dual bands and linear polarization transformation (giant optical activity) with asymmetric transmission wave emissions simultaneously from linearly polarized incident wave at microwave frequencies. Experiment and simulation calculations are in good agreement, indicating that the dual-band circular polarizer features high conversion efficiency around 5.32 GHz and 6.6 GHz in addition to large polarization extinction ratio of more than 16 dB, while cross linear polarization transformation with asymmetric transmission is observed around 10.52 GHz. The transformation behavior for both circular and linear polarizations could be further illustrated by simulated surface current and electric field distributions. The proposed asymmetric chiral metamaterial structure could be useful in designing novel EM or optical devices, as well as polarization control devices.

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Section: Resultssupporting

confidence: 65%

Section: Physical Model Simulation and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dual-Band Circular Polarizer and Linear Polarization Transformer Based on Twisted Split-Ring Structure Asymmetric Chiral Metamaterial

Cheng

Nie²,

Cheng³

et al. 2014

PIER

Self Cite

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A linear‐to‐circular polarization converter based on a bi‐layer frequency selective surface

Lin

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

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In this work, a wideband linear-to-circular polarization converter is proposed based on a bi-layer band-pass frequency selective surface (FSS), whose unit cell consists of two layers of identical patterned metal films mounted on the two sides of a homogeneous dielectric layer, and the geometric pattern of each metal film is a square loop aperture surrounding a concentric square corner-truncated patch. Both measured and simulated results show that the polarization converter can realize linear-to-circular polarization conversion in the frequency range from 6.87 to 10.07 GHz, which corresponds to a fractional bandwidth of 37.8%; moreover, its response is almost independent of the polarization and incidence angle of the incoming wave. Compared with published designs, the proposed polarization converter has a simpler geometry but a wider bandwidth, higher transmittance and better stability, it may possess potential applications in the design of CP antennas.Polarization is an expression of the orientation of the electricflux-lines in an electromagnetic (EM) wave, which is one of important properties of the EM wave, it must be taken into consideration in its practical application. In various wireless systems, such as mobile communications, radar tracking, satellite communications and navigation systems, circularly polarized (CP) waves are preferred due to the advantages such as simplifying alignment and overcoming Faraday rotation effect and multi-path fading. 1 To generate a desired CP wave, in addition to the way to generate it directly using CP antenna, an alternative effective way is to generate a linearly polarized (LP) wave firstly and then convert the LP wave into a CP wave by using a polarization converter. Polarization converter is a kind of polarization control device which can convert an incident wave with a given polarization to a reflected or transmitted wave with a different polarization. Polarization converter can be realized in different ways. In the past decade, it has be found that frequency selective surface (FSS) and metasurface can provide a convenient way to control the polarization state of a EM waves, now different types of polarization converters, such as cross polarization converters, 2-12 and linear-to-circular polarization converters, [13][14][15][16][17][18][19][20][21][22][23] have been realized using various FSSs or metasurfaces.In this work, we propose a transmission-type linearto-circular polarization converter based on a bi-layer bandpass FSS. Its 3 −dB axial ratio bandwidth is up to 37.8%, and the total transmittance remains above −1.69 dB over the entire band; moreover, its response is almost independent of the polarization and incidence angle of the incoming wave and can maintain a stable performance over a wide range of incidence angles at both TE and TM incidences. Compared with published designs, 13-20 the polarization converter has a simpler geometry but a wider working bandwidth, higher transmittance and better stability, it may possess potential applications in the design of CP...

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Asymmetric dual‐band linear‐to‐circular converter by bi‐layered chiral metamaterial

Zhang

2019

Int J RF Microw Comput Aided Eng

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In this article, we present a dual‐band linear‐to‐circular transparent converter by bi‐layered chiral metamaterial (CMM) with an inverted “G” array in microwave region. The proposed metasurface consists of three layers which are the upper layer of the metasurface with a periodic regular metallic inverted “G” and wire array, the dielectric layer, and the bottom layer operating as chiral symmetric structure of the upper. The simulation results show that the transmitted right‐circular polarized wave with the axial ratio of 3 dB or less is in the range of 8.6‐10.9 GHz and the left‐circular polarized wave is within 18.1‐22.5 GHz when y‐polarized forward wave is normally incident. Specifically, the polarization conversion transmission can be maintained at over 85% at angle of incidence up to 40°. Therefore, the proposed CMM device is useful for the development of the integrated polarization manipulation devices.

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Asymmetric chiral metamaterial circular polarizer based on twisted split-ring resonator

Cited by 31 publications

References 30 publications

Dual-Band Circular Polarizer and Linear Polarization Transformer Based on Twisted Split-Ring Structure Asymmetric Chiral Metamaterial

Dual-Band Circular Polarizer and Linear Polarization Transformer Based on Twisted Split-Ring Structure Asymmetric Chiral Metamaterial

A linear‐to‐circular polarization converter based on a bi‐layer frequency selective surface

Asymmetric dual‐band linear‐to‐circular converter by bi‐layered chiral metamaterial

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