Generation of Wideband Tunable Orbital Angular Momentum Vortex Waves Using Graphene Metamaterial Reflectarray

Shi, Yan; Zhang, Ying

doi:10.1109/access.2017.2740323

Cited by 57 publications

(42 citation statements)

References 22 publications

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“…Figure 6 shows a stack of graphene sheets separated by material slabs. In order to study plane wave reflection and transmission by a graphene-material stack, an equivalent circuit model [43] is developed in this section. Consider a uniform transverse electromagnetic (TEM) wave normally incident on the multilayer structure.…”

Section: Equivalent Circuit Model Of Multilayer Graphenementioning

confidence: 99%

“…The conductivity or carrier density of graphene can be tuned by the chemical potential via an external gate voltage. Various intriguing applications such as tunable cloaks [40], reflectarray [42,43], nonlinear optical devices [44], etc., have been proposed and experimentally demonstrated. On the other hand, since Landy et al proposed a thin and nearperfect metamaterial absorber in 2008 [52], various metamaterial absorbers have been demonstrated from microwave to optical frequencies [53,54].…”

Section: Graphene-based Metamaterials Absorbermentioning

confidence: 99%

“…By tuning the conductivities of the graphene sheets in the jth region, the reflection phase of πlj/6 (j =1,…,12) is achieved such that the whole reflectarray can generate a helical profile of exp.(ilϕ). To guarantee independently adjustable conductivities Reprinted from Shi et al [43], with permission from the IEEE.…”

Section: Graphene-based Metamaterials Reflectarray For Orbital Angularmentioning

confidence: 99%

“…The Fermi level of intrinsic graphene can be engineered to support surface plasmons polariton (SPP) [34,35]. These fascinating characteristics promise graphene a nature candidate in the metamaterial/metasurface-based devices including absorbers [36][37][38][39], cloaks [40], filters [41], antennas [42,43], nonlinear optical devices [44], etc. In this chapter, we first review the conductivity model and equivalent circuit model of graphene, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Design of Graphene-Based Metamaterial Absorber and Antenna

Shi¹,

Zhang²

2019

Metamaterials and Metasurfaces

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Graphene is a monolayer of carbon atoms arranged in a honeycomb structure which exhibits remarkable properties including high electron mobility, mechanical flexibility, and saturable absorption. In this chapter, the conductivity model of the graphene is first reviewed. Based on the conductivity model of graphene, the equivalent circuit model of graphene is discussed. By varying graphene's chemical potential via external biasing voltage, graphene conductivity can be flexibly tuned in the terahertz and infrared frequencies. With the tunable characteristic, graphene-based metamaterial absorber and reflectarray have been designed. Good performance in these examples illustrates that graphene promises sufficient flexibility in the design of metamaterial devices.

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Section: Equivalent Circuit Model Of Multilayer Graphenementioning

confidence: 99%

Section: Graphene-based Metamaterials Absorbermentioning

confidence: 99%

Section: Graphene-based Metamaterials Reflectarray For Orbital Angularmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of Graphene-Based Metamaterial Absorber and Antenna

Shi¹,

Zhang²

2019

Metamaterials and Metasurfaces

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“…They have been deeply developed and utilized at present, except for the OAM state. Hopefully, several validated experimental reports are available in optics [3], millimeter wave [4,5], and radio frequency [6][7][8][9]. Due to good collimation, OAM-based communication performs much better in optical and millimeter bands than in the radio frequency.…”

Section: Introductionmentioning

confidence: 99%

Capacity Performance of Wireless Oam-Based Massive Mimo System

Mao¹,

Huang²,

Yang³

et al. 2019

PIER M

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Orbital angular momentum (OAM) as a powerful candidate to enhance the spectral efficiency and system capacity by providing the new degree of freedom for multiplexing has been recently advocated in wireless communications. In this paper, we propose an OAM-based massive multiple-input multiple-output (MIMO) scheme to significantly improve the transmission performance of wireless communication system in line-of-sight scene. The uniform rectangular arrays (URAs) are used as transceivers in our system model, and the ideal OAM antenna model that is capable of providing OAM-channel independently is used as the array element. Multiple reference coordinate systems based on per transmitting antenna and the cumulative phase of specific radio vortices are used to describe the OAM-MIMO channel model. The results of numerical analysis indicate that the proposed OAM-based massive MIMO system could obtain an overwhelming capacity gain against the conventional MIMO system.

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Space‐Time Coding Metasurface For Multifunctional Holographic Imaging

Hu,

Chen,

Shi

et al. 2024

Adv Materials Technologies

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Holographic imaging as one of promising image techniques reconstructs object image using the amplitude and phase information scattered from objects. Programmable metasurface composed of digitally coding unit cells can arbitrarily manipulate amplitude and phase of the scattering wave by tailoring operation states of the unit cells, and thus achieves high‐resolution imaging reconstruction. However, the conventional metasurface can only achieves a desired holographic image on an imaging plane. This paper presented a time‐space coding 2‐bit metasurface to overcome this challenge. By rapidly switching PIN diodes loaded in metasurface unit cell according to the customized time sequences, the magnitude and phase of the ±1st order harmonic fields can be fully controlled, achieving the hologram imaging at the higher order harmonics. The proof‐of‐concept measurements are given to demonstrate the versatile holographic imaging functions at the ±1st order harmonics including two different holographic images on an imaging plane, holographic imaging and beam scanning, and holographic imaging and orbital angular momentum (OAM) wave generation, which undoubtedly enriches the applications of the programmable metasurfaces in the field of the holographic imaging.

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Generation of Wideband Tunable Orbital Angular Momentum Vortex Waves Using Graphene Metamaterial Reflectarray

Cited by 57 publications

References 22 publications

Design of Graphene-Based Metamaterial Absorber and Antenna

Design of Graphene-Based Metamaterial Absorber and Antenna

Capacity Performance of Wireless Oam-Based Massive Mimo System

Space‐Time Coding Metasurface For Multifunctional Holographic Imaging

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