Cross polarization converter formed by rotated-arm-square chiral metamaterial

Rajkumar, R.; Yogesh, N.; Subramanian, V.

doi:10.1063/1.4846096

Cited by 34 publications

(11 citation statements)

References 33 publications

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“…Then, the crosspolarization conversion (CPC), known as the 90°polarization rotator, can convert x or y linearly polarized beams into y or x linearly polarized beams. Due to the fact that CPC plays a major role in optical logic circuits and optoelectronic systems, plentiful CMM systems have been established to obtain it, such as the rotated-arm-square 25) and bilayer cut-wires. 26) In this paper, the optical anisotropy of ultra-thin bilayer L-shaped metal metasurfaces separated by a 200-nm-thick silicon dioxide (SiO 2 ) substrate spacer is numerically and theoretically researched.…”

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confidence: 99%

Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces

Shang

Zhai

Wang

et al. 2017

Appl. Phys. Express

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We numerically and theoretically investigate the optical anisotropy of ultra-thin bilayer L-shaped metal metasurfaces separated by a 200-nm-thick silicon dioxide (SiO2) substrate spacer. A broadband asymmetric transmission (AT) to forward and backward propagate electromagnetic waves can be acquired from linearly polarized waves. Additionally, narrowband cross-polarization conversion (CPC) can be realized by x linearly polarized electromagnetic illumination. The calculated results demonstrate that the full width at half maximum (FWHM) of AT is 965 nm, and the maximum value of the asymmetric parameter can reach up to 0.48. The polarization conversion rate (PCR) for CPC is more than 80%.

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confidence: 99%

Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces

Shang

Zhai

Wang

et al. 2017

Appl. Phys. Express

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“…4. The mechanism of generated optical activity in TCMM metamaterial can be understood based on the coupling mechanism between electric and magnetic dipoles [4,18,22]. A y-polarized E-field incident normally to the structure excites a current on the surface of metallic pattern which flows in symmetric and antisymmetric manner between the top and bottom metallic structure of chiral metamaterial.…”

Section: Transmitted Electric Field Andmentioning

confidence: 99%

Nearly-perfect circular polarization converter formed by triangular-geometric chiral metamaterial

Rajkumar

Yogesh

Subramanian

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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We demonstrate experimentally and numerically that a bilayer triangular-shaped chiral metamaterial (TCMM) gives a nearly perfect cross-polarization with 90% polarization conversion efficiency reported at X-band regime. The giant optical activity in the proposed TCMM arises due to the strong cross-coupling between the electric and magnetic dipole as a result of generated strong rotatory-power for the normally incident electromagnetic-wave. It is showed that TCMM can convert the linearly polarized wave into right/left circularly polarized wave. A chiral resonance at 10.32GHz rotates ypolarized electric field into x-polarized field with almost 90% transmission magnitude. Right and left circularly wave possesses different refractive-indices due to presence of chirality-factor (κ) in optically active TCMM metamaterial. The mechanism of cross-coupling is understood based on surface current distribution on the metallic patterns. The proposed polarization converter may be regarded as potential polarizing elements in optical polarization spectroscopy and microwave photonics applications with different length-scale.

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“…A linear polarization converter usually rotates the polarization direction of a linearly polarized electromagnetic wave by 90 degree, making it perpendicular to the original one. To the best of our knowledge, the mechanism of most FSSs or metasurface-based polarization converters is often described by the extrinsic chirality in the propagation direction 27 , 36 , 37 or discrepant phase and amplitude modulations of the orthogonal transmission components based on the near-field electromagnetic coupling 28 , 38 , 39 . For the unit cell of metasurface, its size is usually electrically small (or in sub-wavelength scale), which calls for high-precision in fabrication and integration.…”

Section: Introductionmentioning

confidence: 99%

Dual-band transmission polarization converter based on planar-dipole pair frequency selective surface

Wang

Liu

Geyi

2018

Sci Rep

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A novel linear polarization converter operating in C- and X-bands with high polarization conversion ratio is described and demonstrated based on frequency selective surface. The building element is a planar-dipole pair, which is orthogonally printed on a double-layer substrate and vertically connected by a pair of through-via holes functioning as a quasi-two-wire transmission line coupler. A perforated metal shielding layer is sandwiched between the double-layer structure to only support a transverse electric and magnetic (TEM) mode coupling between the top and bottom dipolar components. The front dipole responds to the incident transverse electric (TE) wave, and sends the induced current into the two-wire transmission line to feed the bottom dipole. The bottom dipole is orthogonal or oriented at an arbitrary angle with respect to the top one, and a resultant outgoing transverse magnetic (TM) wave or arbitrary orientation polarized wave can be achieved. In addition, a bidirectional orthogonal polarization converter is realized by using double orthogonally arranged planar-dipole pairs, which are also printed on the same double-layer substrate.

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Cross polarization converter formed by rotated-arm-square chiral metamaterial

Cited by 34 publications

References 33 publications

Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces

Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces

Nearly-perfect circular polarization converter formed by triangular-geometric chiral metamaterial

Dual-band transmission polarization converter based on planar-dipole pair frequency selective surface

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