Tunable circular conversion dichroism and asymmetric transmission of terahertz graphene metasurface composed of split rings

Asgari, Somayyeh; Rahmanzadeh, Mahdi

doi:10.1016/j.optcom.2019.124623

Cited by 38 publications

(19 citation statements)

References 23 publications

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“…Then, differently polarized converters have been proposed based on the metasurface. Some works were proposed to realize LP to CP for the entire microwave frequency band, [22][23][24][25][26] while others can achieve polarization conversion within terahertz band (THz). [27][28] For enhancing the conversion bandwidth, various metasurfaces have been designed to manipulate the polarizations of transmissive waves.…”

Section: Introductionmentioning

confidence: 99%

Quad‐Band Transmissive Metasurface with Linear to Dual‐Circular Polarization Conversion Simultaneously

Han

et al. 2021

Advcd Theory and Sims

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Metasurface is a momentous periodic or aperiodic microstructure which has capabilities in controlling polarization of electromagnetic waves. To realize polarization controlling, many microstructures have been designed to achieve the function. However, multi-band linear to dual-circular polarization converter is rarely proposed and designed in the last few years. Here, a quad-band dual-circular transmissive metasurface (QCT-MS) is proposed to manipulate polarization of transmissive wave. QCT-MS is designed as a three-layer microstructure, with substrate in the middle and two metal patches in the shape of bi-symmetrical arrow on both sides. The proposed microstructure manipulates linear polarization waves to dual-circular polarization waves in different frequency bands with x-polarized or y-polarized incident waves. The experimental and simulated results reveal that left-hand circularly polarized waves can be realized in 3.14-3.32, 4.41-4.46, and 14.82-16.05 GHz while the right-hand circularly polarized waves can be achieved from 9.45 to 10.12 GHz for QCT-MS with x-polarized incidences. Moreover, the simulated results also demonstrate its characteristics of wide-angle transmission and periodic changes. The proposed transmissive metasurface can be utilized in multiband communication and multifunctional dual-circularly polarized antenna systems.

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Section: Introductionmentioning

confidence: 99%

Quad‐Band Transmissive Metasurface with Linear to Dual‐Circular Polarization Conversion Simultaneously

Han

et al. 2021

Advcd Theory and Sims

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“…Based on the remarkable effect of circular conversion dichroism, it is potentially possible to make a compact and efficient AT polarization converter [9][10][11]. Recently, great efforts have been made to achieve the AT effect for linearly polarized waves in the THz region with chiral metamaterials [12][13][14][15][16]. Dai et al realized the AT effect for linearly polarized waves in the THz region with a chiral metamaterial structure consisting of two double-T structures, where the AT parameter (the difference between the total transmitted intensities for different propagation directions) remains higher than 0.35 in 1.38-1.63 THz [17].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Asymmetric Transmission of Red-Near-Infrared Light Based on Chiral Metamaterial

et al. 2021

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Designing and fabricating high-performance polarization converters that exhibit asymmetric transmission (AT), for light with different circularly/linearly polarized states with opposite propagating directions, are in high demand. The AT phenomenon leads to potential applications as isolators and circulators in information and communication systems. We propose a chiral metamaterial structure with high AT efficiency for two types of linearly orthogonal polarized red-near-IR light in two opposite incident directions. Theoretical results showed that the proposed chiral metamaterial structure achieves cross-polarization conversion where the polarization conversion ratio (PCR) is over 90%, in a broadband wavelength range from 715 to 810 nm, for both forward-propagating linearly polarized light and backward-propagating orthogonal linearly polarized light. The physical mechanisms of the polarization converter with the AT have been investigated. It was confirmed that the Fabry–Perot-like resonance and coupling between electric and magnetic dipoles lead to highly efficient asymmetric polarization conversion for two orthogonal linearly polarized light. Additionally, the conversion efficiency and bandwidth of the polarization converter are successfully optimized by adjusting the related structure parameters.

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“…power splitter [24,25], metamaterials [26,27], metasurfaces [28,29], as well as graphenebased plasmonic induced transparency (PIT) and reflection-induced (PIR) effects [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Applications Of Tunable Mid-Infrared Plasmonic Square-Nanoring Resonator Based On Graphene Nanoribbon

Janfaza

Mansouri-Birjandi

Tavousi³

2021

Preprint

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In this work, different structures are designed based on graphene square-nanoring resonator (GSNR) and simulated by the three-dimensional finite-difference time-domain (3D-FDTD) method. Depending on the location and number of graphene nanoribbons (GNR), the proposed structures can be utilized as a band-pass filter, wavelength demultiplexer, or power splitter in the mid-infrared (MIR) wavelengths. The tunability of the suggested assemblies is easily controlled by changing the dimensions and/or the chemical potential of the GSNRs. Benefiting from the nanoscale and ultra-compact GNRs, these structures can be proposed as basic blocks for optical computing and signal processing in the MIR region.

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Tunable circular conversion dichroism and asymmetric transmission of terahertz graphene metasurface composed of split rings

Cited by 38 publications

References 23 publications

Quad‐Band Transmissive Metasurface with Linear to Dual‐Circular Polarization Conversion Simultaneously

Quad‐Band Transmissive Metasurface with Linear to Dual‐Circular Polarization Conversion Simultaneously

High-Efficiency Asymmetric Transmission of Red-Near-Infrared Light Based on Chiral Metamaterial

Applications Of Tunable Mid-Infrared Plasmonic Square-Nanoring Resonator Based On Graphene Nanoribbon

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