Broadband polarization transformation via enhanced asymmetric transmission through arrays of twisted complementary split-ring resonators

Wei, Zeyong; Cao, Yang; Fan, Yuancheng; Xing, Yu; Li, Hongqiang

doi:10.1063/1.3664774

Cited by 248 publications

(153 citation statements)

References 28 publications

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“…In part inspired by biological species that are well equipped with broadband, conformal circular polarization sensors 12 , optical activity and circular dichroism have been shown in either planar [13][14][15][16][17][18] or three-dimensional metamaterials 3,19,20 . Planar structures generally exhibit much weaker circular dichroism compared with 3D geometries, because an infinitesimally thin device is inherently achiral, and excitation at oblique incidence or some form of nonreciprocal response is required to distinguish between LCP and RCP transmissivity 21 .…”

mentioning

confidence: 99%

“…Planar structures generally exhibit much weaker circular dichroism compared with 3D geometries, because an infinitesimally thin device is inherently achiral, and excitation at oblique incidence or some form of nonreciprocal response is required to distinguish between LCP and RCP transmissivity 21 . In this context, the concept of extrinsic chirality has been recently put forward, showing that, by pairing two closely spaced planarized inclusions with some form of 3D chirality, may produce a narrow-band chiral response near their resonance [13][14][15][16][17][18] .…”

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confidence: 99%

“…Our goal is to show that, by introducing a twist in the lattice orientation of metamaterial inclusions, we can relax the usual requirements on fabrication and achieve exotic effects analogous to 3D metamaterials, but with much simpler fabrication schemes. In this context, it has been recently shown at microwave frequencies 18 that broadband linear polarization conversion may be obtained by coupling together twisted magnetic inclusions. Here we show that broadband circular polarization selectivity may be achieved in twisted arrays of metasurfaces without the need of complicated inclusion shape, with no requirement on the relative alignment, and at optical frequencies.…”

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Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

2012

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optical metamaterials are usually based on planarized, complex-shaped, resonant nanoinclusions. Three-dimensional geometries may provide a wider set of functionalities, including broadband chirality to manipulate circular polarization at the nanoscale, but their fabrication becomes challenging as their dimensions get smaller. Here we introduce a new paradigm for the realization of optical metamaterials, showing that three-dimensional effects may be obtained without complicated inclusions, but instead by tailoring the relative orientation within the lattice. We apply this concept to realize planarized, broadband bianisotropic metamaterials as stacked nanorod arrays with a tailored rotational twist. Because of the coupling among closely spaced twisted plasmonic metasurfaces, metamaterials realized with conventional lithography may effectively operate as three-dimensional helical structures with broadband bianisotropic optical response. The proposed concept is also shown to relax alignment requirements common in three-dimensional metamaterial designs. The realized sample constitutes an ultrathin, broadband circular polarizer that may be directly integrated within nanophotonic systems.

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Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

2012

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“…From microwave to optical ranges, negative refraction [1], giant gyrotropy [2], optical activity [3][4][5][6], circular dichroism (CD) [7][8][9], asymmetric transmission (AT) [10][11][12][13], and linear or/to circular polarization conversion [14][15][16] can be explored and realized by special CMM design. Essentially, these unique EM properties mainly originate from cross-coupling of the electric and magnetic fields among these chiral structures [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…However, multi-band or bandwidth expansion is still a main concern which needs improvement. An effective method is stacking metallic-dielectric multilayer planar structure [40], which gives some new ideas for multi-band or broadband device design for polarization transformation [11,25,40,41].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Compact Multi-Band Chiral Metamaterial Circular Polarizer Based on Triple Twisted Split-Ring Resonator

Cheng¹,

Cheng³

et al. 2016

PIER

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Abstract-An ultra-compact chiral metamaterial (CMM) using triple-layer twisted split-ring resonators (TSRRs) structure was proposed, which can function as a multi-band circular polarizer. This ultra-compact structure CMM can convert an incident linearly y-polarized (x-polarized) wave propagating along the −z(+z) direction to the transmitted left circularly polarized (LCP) waves at 7.28 GHz, 13.22 GHz and 15.49 GHz while the right circularly polarized (RCP) waves are at 9.48 GHz simultaneously. In addition, the large polarization extinction ratio (PER) of more than 20 dB across four resonance frequencies can be achieved. The experiment results are in good agreement with the numerical simulation results. The surface current distributions of the structure are analyzed to illustrate this linear to circular polarization conversion. The unit cell structure is extremely small both in longitudinal and transverse directions. Good performances and compact design of this CMM suggest promising applications in circular polarizers that need to be integrated with other compact devices.

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A Wideband Cross Polarization Conversion Using Metasurface

2017

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A cross polarization conversion (CPC) structure using metasurface over wide bandwidth has been presented for practical applications in this article. The unit cell of the proposed metasurface is made of metallic patch of single circular split‐ring imprinted on top surface of a metal‐backed single‐layer dielectric substrate. Full width at half maxima bandwidth of polarization conversion ratio (PCR) of 11.12 GHz is realized along with wide bandwidth of 9.92 GHz extending from 6.06 GHz to 15.98 GHz with more than 0.8 PCR magnitude is realized using suitable optimization of the geometrical dimensions. Four distinct PCR peaks are observed at 6.56 GHz, 10.38 GHz, 15.12 GHz, and 16.68 GHz. The polarization conversion phenomena at these four frequencies have been analyzed in the light of electromagnetic resonances. The roles of several geometrical parameters of the design are simultaneously investigated. The proposed structure has been studied under oblique incidence, both for transverse electric and transverse magnetic polarizations. Wideband polarization conversion characteristics up to 45° incident angles have been observed for both cases. A prototype of the proposed metasurface is fabricated, and experimental results are in good agreement with the simulated responses. The proposed structure is ultrathin; ~λ/11.8 with respect to the center frequency of the CPC bandwidth.

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Broadband polarization transformation via enhanced asymmetric transmission through arrays of twisted complementary split-ring resonators

Cited by 248 publications

References 28 publications

Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

Ultra-Compact Multi-Band Chiral Metamaterial Circular Polarizer Based on Triple Twisted Split-Ring Resonator

A Wideband Cross Polarization Conversion Using Metasurface

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