Generating an orbital-angular-momentum beam with a metasurface of gradient reflective phase

Xu, Bo; Wu, Chao; Wei, Zeyong; Fan, Yuancheng; Li, Hongqiang

doi:10.1364/ome.6.003940

Cited by 68 publications

(20 citation statements)

References 28 publications

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“…Their experiments paved a way to generate the OAM vortex waves for radio and microwave wireless communication applications. In the same year, Xu et al demonstrated a simple design to generate OAM beams by using metasurface with gradient reflection phase which was equally divided into eight regions instead of the spiral arrangement and each part was packed with the identical metasurface units in microwave band [23]. This kind of metasurface is similar to a reflection array.…”

Section: Rotating Parabolicmentioning

confidence: 99%

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Zheng¹,

Chen²,

Ji³

et al. 2020

PIER

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It becomes more and more challenging to satisfy the long-term demand of transmission capacity in wireless networks if we limit our research within the frame of traditional electromagnetic wave characteristics (e.g., frequency, amplitude, phase and polarization). The potential of orbital angular momentum (OAM) for unleashing new capacity in the severely congested spectrum of commercial communication systems is generating great interest in wireless communication field. The OAM vortex wave/beam has different topological charges, which are orthogonal to each other. It provides a new way for multiplexing in wireless communications. Electromagnetic wave or synthetic beam carrying OAM has a spiral wavefront phase structure, which may provide a new degree of freedom or better orthogonality in spatial domain. In this paper, we introduce the fundamental theory of OAM. Then, OAM generation and reception methods are equally demonstrated. Furthermore, we present the latest development of OAM in wireless communication. We further discuss the controversial topic "whether OAM provides a new degree of freedom" and illustrate our views on the relationship between OAM and MIMO. Finally, we suggest some open research directions of OAM.

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Section: Rotating Parabolicmentioning

confidence: 99%

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Zheng¹,

Chen²,

Ji³

et al. 2020

PIER

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“…Gradient metasurface (GM) is a special kind of metasurface, which was first proposed by Yu et al [1] to demonstrate generalised Snell's law. As the resonators in different unit cells in a GM vary regularly along with the change of the locations, it will have a space‐variant phase response and will be able to introduce an additional wave vector component to manipulate the directions of the refracted/reflected waves freely, thus based on various GMs, many extraordinary phenomena can be realised, such as anomalous reflection/refraction [1–11], negative refraction [12, 13], surface wave conversion [14, 15], beam focusing [16–24] and vortex beam generation [25–31].…”

Section: Introductionmentioning

confidence: 99%

Ultra‐wideband anomalous reflection realised by a gradient metasurface

Lin

Guo

et al. 2020

IET Microwaves, Antennas & Propagation

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“…Own to the powerful wave manipulation abilities and planar characteristics, metasurface possesses special advantages compared with traditional optical devices, such as low profile, easy fabrication, and integration. In recent years, singular electromagnetic properties have been realized by metasurface, including anomalous reflection/refraction, flat lens, plasmonic lithography, high‐resolution imaging, vortex beam generation, and computer‐generated holograms . Among these, the metalenses are the indispensable elements in the design of the functional optical devices .…”

Section: Introductionmentioning

confidence: 99%

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

Cheng

Wei

Fan

et al. 2019

Advanced Optical Materials

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Metasurfaces with locally controlled phase discontinuity are promising for novel manipulations of the optical fields. However, the high insert loss at off‐resonance frequencies and narrow operation band of the resonant metasurface lead to the common low efficiency, obstructing it from practical applications. Here, it is shown that a broadband transparent metasurface, made of three‐layer complementary square ring resonator (CSRR) arrays, can be employed for high‐efficiency and broadband beam manipulation. The nonuniform metasurface can be optimized with high transmittance (above 90%) while maintaining full range (from 0 to 2π) phase modulation by adjusting the geometric parameters of the CSRR on the middle layer. The physical insight can be understood with a coupled oscillator model, it is found that the interlayer coupling constant is the key factor to realize phase modulation with high efficiency. A transmittance metalens with long focal depth in broadband is experimentally demonstrated as an example, the measured transmission efficiency is higher than 80%. The developed broadband wavefront engineering elements can be employed for high‐performance, miniaturized and superior environmental suitability sensing, imaging, and communication system.

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Generating an orbital-angular-momentum beam with a metasurface of gradient reflective phase

Cited by 68 publications

References 28 publications

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Research Status and Prospects of Orbital Angular Momentum Technology in Wireless Communication

Ultra‐wideband anomalous reflection realised by a gradient metasurface

Realizing Broadband Transparency via Manipulating the Hybrid Coupling Modes in Metasurfaces for High‐Efficiency Metalens

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