Bandwidth broadening of a graphene-based circular polarization converter by phase compensation

Gao, Xi; Yang, W. L.; Cao, Weihua; Chen, Ming; Jiang, Yannan; Yu, Xiaoxiao; Li, Haiou

doi:10.1364/oe.25.023945

Cited by 47 publications

(21 citation statements)

References 19 publications

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“…Nanocross has also been used in to efficiently convert the polarization states [32], [34]. Other structures, such as Hollow-Carved "H" Array [41], butterfly-shaped holes [42], have also been demonstrated to be suitable to achieve high polarization conversion efficiency. Nevertheless, most of these polarization devices work at the mid-infrared range with relatively narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Zhu¹,

Li²,

Deng³

et al. 2018

Opt. Mater. Express

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A new wideband sinusoidally-slotted graphene-based cross-polarization converter (CPC) is proposed in this paper. The proposed polarization converter can realize a broadband terahertz polarization conversion from 1.28 to 2.13-THz with a polarization conversion ratio (PCR) of more than 0.85. Taking advantage of the gradient width modulation of the graphene-based unit structure, the continuous plasmon resonances are excited at the edges of the sinusoidal slot. Therefore, the proposed converter can achieve a broadband polarization conversion in a simplified structure. Furthermore, the polarization conversion characteristics of the CPC are insensitive to the incident angle. The PCR remains more than 0.85 with little bandwidth degradation even as the incident angle increases to as high as 50°. More importantly, the operating bandwidth and the magnitude of the PCR can be tuned easily by adjusting the chemical potential and the electron scattering times of the graphene. In a way, we believe this kind of graphene-based polarization converter can enrich the polarization conversion community for realizing broadband and tunable polarization conversion.

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Section: Introductionmentioning

confidence: 99%

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Zhu¹,

Li²,

Deng³

et al. 2018

Opt. Mater. Express

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“…The theoretical study indicates by electrically controlling the liquid crystal director angle that the dynamic bandwidth of such hybrid quarter-wave plate achieves 78% centered at 1.15 THz. The design in Figure 8d has shown similar dynamic bandwidth by independently biasing the top graphene pattern and the bottom graphene film [83]. The bottom layer composed of seven layers of graphene acts as a reflector with a tunable reflection phase, which is used to compensate the difference of phase delay due to the frequency shift.…”

Section: Polarization Modulation In Graphene Metasurfacesmentioning

confidence: 99%

“…The bottom seven layers of graphene show a tunable reflection phase in order to compensate the difference of the phase delay due to the frequency shift over a wide bandwidth. Reproduced with permission from [83], Copyright The authors, 2017.…”

Section: Figurementioning

confidence: 99%

Recent Progress on Graphene-Functionalized Metasurfaces for Tunable Phase and Polarization Control

2019

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The combination of graphene and a metasurface holds great promise for dynamic manipulation of the electromagnetic wave from low terahertz to mid-infrared. The optical response of graphene is significantly enhanced by the highly-localized fields in the meta-atoms, and the characteristics of meta-atoms can in turn be modulated in a large dynamic range through electrical doping of graphene. Graphene metasurfaces are initially focused on intensity modulation as modulators and tunable absorbers. In this paper, we review the recent progress of graphene metasurfaces for active control of the phase and the polarization. The related applications involve, but are not limited to lenses with tunable intensity or focal length, dynamic beam scanning, wave plates with tunable frequency, switchable polarizers, and real-time generation of an arbitrary polarization state, all by tuning the gate voltage of graphene. The review is concluded with a discussion of the existing challenges and the personal perspective of future directions.

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“…Recent efforts have started to be devoted to the design of the reconfigurable multifunctional metasurface by hybridizing metasurfaces with tunable metaparticles, such as the vanadium dioxide (VO 2 ), graphene, liquid crystal, micro-electromechanical system (MEMS), varactor diode and PIN diode [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. It is widely known that manipulation of the polarization state of electromagnetic (EM) waves [ 36 , 37 , 38 , 39 , 40 , 41 ] and the switch of the amplitude of transmission and reflection [ 42 , 43 , 44 , 45 ] are of paramount importance in both THz scientific and engineering applications. Thus, it makes a great significance to integrate these two functions into a single metasurface.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Multifunctional Metasurface Hybridized with Vanadium Dioxide at Terahertz Frequencies

Hong

Deng

et al. 2018

Materials

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Driven by the continuous demand for system integration and device miniaturization, integrating multiple diversified functions into a single metasurface hybridized with the tunable metaparticle is highly demanding at terahertz (THz) range. However, up to now, because of the limitation of the tunable metaparticle at terahertz range, most of the metasurfaces feature a single function only or process similar functionalities at a single frequency. A reconfigurable multifunctional metasurface which can realize the switch of transmission and reflection and manipulate the linearized polarization state of electromagnetic waves simultaneously over a controllable terahertz frequency range based on the vanadium dioxide was designed for the first time in the paper. The numerical result demonstrates the validity of the appropriately designed metasurface. Simulation results show that the reconfigurable and multifunctional performance of this metasurface can be acquired over 1.59 THz to 1.74 THz without re-optimizing or re-fabricating structures, which effectively extends the operating frequencies. The proposed metasurface holds potential for electromagnetic wave manipulation and this study can motivate the realization of the wideband multifunctional metasurface and the software-driven reconfigurable metasurface at terahertz frequencies.

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Bandwidth broadening of a graphene-based circular polarization converter by phase compensation

Cited by 47 publications

References 19 publications

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Recent Progress on Graphene-Functionalized Metasurfaces for Tunable Phase and Polarization Control

Reconfigurable Multifunctional Metasurface Hybridized with Vanadium Dioxide at Terahertz Frequencies

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