Graphene-based THz tunable ultra-wideband polarization converter

Sajjad, Muhammad; Kong, Xiangkun; Liu, Shaobin; Ahmed, Afzal; Rahman, Saeed Ur; Wang, Qi

doi:10.1016/j.physleta.2020.126567

Cited by 29 publications

(11 citation statements)

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“…Such resonance is essential for achieving high efficiency and wide bandwidth, the induced magnetic response is always 45° relative to the incident polarized wave, the magnetic field can be decomposed two vertical components H x and H y . H x is perpendicular to the incident electric field E, there is no cross-coupling because the incident and reflected magnetic fields are in the same direction [ 53 ]. H y parallel to the incident electric field E, it produces an induced electric field perpendicular to the incident electric field E, so the incident wave can be converted to orthogonal polarization [ 54 , 55 ].…”

Section: Resultsmentioning

confidence: 99%

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

et al. 2021

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A hybrid dual-frequency polarized reconfigurable terahertz antenna is designed and studied. Graphene and TOPAS are employed as the polarization conversion metasurface and dielectric substrate, respectively, enabling tunable polarization conversion and circular polarization. TOPAS is a good substrate material for broadband THz components due to its low absorption. By adjusting the chemical potential of graphene between 0 eV and 0.5 eV, the polarization state in the band of 1 THz (0.76–1.02 THz) and 2.5 THz (2.43–2.6 THz) can be reconstructed. Thanks to the multilayer graphene structure and low absorption TOPAS, the graphene metasurface exhibits a broad bandwidth of 0.26 and 0.17 THz, respectively, in the band of 1 THz and 2.5 THz. The working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around 1 THz (0.7–0.75 THz, 0.96–1.04 THz) and 2.5 THz (2.42–2.52 THz), respectively, without changing the physical geometry. Moreover, the graphene antenna, metasurface, and hybrid structure are tested, respectively, to verify that the components do not interfere with each other in performance. The hybrid antenna shows great potential in tunable terahertz devices and related applications.

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Section: Resultsmentioning

confidence: 99%

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

et al. 2021

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“…J. X. Zhao et al designed a three-layered metal-graphene-metal terahertz metamaterial structure to construct the switchable linear asymmetric transmission and polarization conversion through tuning the Fermi energy of graphene [115]. M. Sajjad et al used double slotted graphene structure to construct multi-functional metamaterial polarization converter [116]. The device can achieve LTC polarization conversion and circular to cross-polarization conversion.…”

Section: Graphene-based Multi-functional Metamaterials Polarization C...mentioning

confidence: 99%

“…The bandwidth of a metamaterial polarization converters can usually be improve based on the stack of multi-layer structures. In 2020, M. Sajjad et al used double slotted graphene structure to enhance the bandwidth [116]. The proposed design can be used as an ultra broad-band (3.75-11.35 THz) LTL and CTC polarization converter with the PCR of 0.85.…”

Section: Graphene-based Multi-functional Metamaterials Polarization C...mentioning

confidence: 99%

A Review: The Functional Materials-Assisted Terahertz Metamaterial Absorbers and Polarization Converters

et al. 2022

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When metamaterial structures meet functional materials, what will happen? The recent rise of the combination of metamaterial structures and functional materials opens new opportunities for dynamic manipulation of terahertz wave. The optical responses of functional materials are greatly improved based on the highly-localized structures in metamaterials, and the properties of metamaterials can in turn be manipulated in a wide dynamic range based on the external stimulation. In the topical review, we summarize the recent progress of the functional materials-based metamaterial structures for flexible control of the terahertz absorption and polarization conversion. The reviewed devices include but are not limited to terahertz metamaterial absorbers with different characteristics, polarization converters, wave plates, and so on. We review the dynamical tunable metamaterial structures based on the combination with functional materials such as graphene, vanadium dioxide (VO2) and Dirac semimetal (DSM) under various external stimulation. The faced challenges and future prospects of the related researches will also be discussed in the end.

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“…15 In recent years, there has been a growing interest among researchers in graphene-based polarization converters, primarily due to their exceptional tunability of conductivity via chemical doping or electrostatic gating. [16][17][18][19][20][21][22][23] Polarization conversion devices mentioned above have largely been limited to single or dual-band responses, neglecting the potential of tri-band frequency spectrum properties. Recently, Yao et al and Zhang et al have successively proposed tri-band mid-infrared reflective polarization converters based on L-shaped graphene and ellipse graphene with a slit, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, there has been a growing interest among researchers in graphene-based polarization converters, primarily due to their exceptional tunability of conductivity via chemical doping or electrostatic gating 16 – 23 Polarization conversion devices mentioned above have largely been limited to single or dual-band responses, neglecting the potential of tri-band frequency spectrum properties. Recently, Yao et al.…”

Section: Introductionmentioning

confidence: 99%

Tunable reflective tri-band polarization converter based on graphene composite metasurface

Wen

Zhu

et al. 2023

Opt. Eng.

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.A graphene composite metasurface-based reflective tri-band polarization converter working in the terahertz frequency regime is proposed and investigated by CST Microwave Studio software. The polarization converter achieves high polarization conversion ratios (above 99%) for linear-to-linear polarization conversion at 6.21, 9.11, and 11.66 THz, and for linear-to-circular polarization conversion at 5.14 THz, with a fixed Fermi energy level (Ef) of 1.0 ev due to the excitation of localized surface plasmons. Subsequently, the reason for cross-polarization conversion at three resonant frequencies and the incident angle sensitive property of the converter were discussed. Based on the graphene component, a tunable tri-band polarization converter was obtained and investigated; this converter could be applied in the active modulation area of wireless communication.

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Graphene-based THz tunable ultra-wideband polarization converter

Cited by 29 publications

References 1 publication

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

A Review: The Functional Materials-Assisted Terahertz Metamaterial Absorbers and Polarization Converters

Tunable reflective tri-band polarization converter based on graphene composite metasurface

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