Multiple Orbital Angular Momentum Beams with High‐Purity of Transmission‐Coding Metasurface

Liu, Xiaobin; Li, Si Jia; He, Chengyuan; Li, Zhuoyue; Huang, Guoshuai; Cao, Xiangyu

doi:10.1002/adts.202200842

Cited by 22 publications

(5 citation statements)

References 44 publications

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“…Hence, the two different OAM modes can be achieved by TDC-MS simultaneously. Space-division multiplexing is realized because of the required phase distributions (coding sequences) and phase compensation . Mode-division multiplexing and space-division multiplexing are realized by the proposed TDC-MS.…”

Section: Resultsmentioning

confidence: 99%

“…Analogously, similar results can be obtained in the y-direction when the length of the metal string ay is varied along the y-axis. Based on the above principle in Figure 1c, the metallic cross dipole with different geometric parameters is proposed for 41 Mode-division multiplexing and spacedivision multiplexing are realized by the proposed TDC-MS.…”

Section: Resultsmentioning

confidence: 99%

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Transmissive Digital Coding Metasurfaces for Polarization-Dependent Dual-Mode Quad Orbital Angular Momentum Beams

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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In wireless communication systems, a multibeam can be used to increase the number of spatial channels by space-division multiplexing. Furthermore, the multimode is used to enhance the channel capacity by mode-division multiplexing. However, few of the previously reported methods cannot achieve independent controls of orbital angular momentum (OAM) states by transmissive metasurfaces in both space-division and mode-division multiplexing simultaneously. To expand the wireless communication channel, a multilayer transmissive digital coding metasurface with a single emitting source is demonstrated for quad-OAM beam generation with a dual mode. By changing the geometry of the cross dipole for a unit cell, the polarization-dependent 3-bit phase responses are obtained to flexibly manipulate the multi-OAM beams with different modes in preset directions simultaneously. Two types of metasurfaces are designed and fabricated to realize four OAM beams with two topological charges in different directions by encoding the phase sequence in x- and y-directions, which is validated by both theoretical analyses and experimental results. This scheme of transmissive digital coding metasurface provides a simple way to the multiplexing, multichannel, and multiplatform communication and imaging systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Transmissive Digital Coding Metasurfaces for Polarization-Dependent Dual-Mode Quad Orbital Angular Momentum Beams

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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“…To verify the aforementioned designed functions, the full-wave simulations are conducted by using a finite-difference time-domain (FDTD) solver in commercially available numerical software, CST microwave studio [27,28]. In the simulations, moreover, a tetrahedral mesh with the adaptive mesh scheme is utilized to optimize the numerical simulation accuracy, in which the moderate mesh accuracy is adopted to make good tradeoff between accuracy, memory requirements and simulation time.…”

Section: Design and Simulation Of Metasurface Unit Cellsmentioning

confidence: 99%

Full-Space Wavefront Shaping of Broadband Vortex Beam with Switchable Terahertz Metasurface Based on Vanadium Dioxide

Li,

Zhang,

Jiang

et al. 2023

Nanomaterials

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Currently, vortex beams are extensively utilized in the information transmission and storage of communication systems due to their additional degree of freedom. However, traditional terahertz metasurfaces only focus on the generation of narrowband vortex beams in reflection or transmission mode, which is unbeneficial for practical applications. Here, we propose and design terahertz metasurface unit cells composed of anisotropic Z-shaped metal structures, two dielectric layers, and a VO2 film layer. By utilizing the Pancharatnam–Berry phase theory, independent control of a full 2π phase over a wide frequency range can be achieved by rotating the unit cell. Moreover, the full-space mode (transmission and reflection) can also be implemented by utilizing the phase transition of VO2 film. Based on the convolution operation, three different terahertz metasurfaces are created to generate vortex beams with different wavefronts in full-space, such as deflected vortex beams, focused vortex beams, and non-diffraction vortex beams. Additionally, the divergences of these vortex beams are also analyzed. Therefore, our designed metasurfaces are capable of efficiently shaping the wavefronts of broadband vortex beams in full-space, making them promising applications for long-distance transmission, high integration, and large capacity in 6G terahertz communications.

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“…Metasurfaces 1−8 are composite structures formed by arranging numerous artificially engineered subwavelength unit elements in two-dimensional (2D) space, which have attracted extensive attention and research in various fields such as microwave, 9,10 millimeter wave, 11 terahertz, 3,12−14 optics, 15−18 and acoustics 19,20 due to their abilities to manipulate spatial incident waves flexibly. Accordingly, special electromagnetic (EM) phenomena such as perfect refraction 4,21 and negative refraction 19 have been observed based on the metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

Li,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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The electromagnetic (EM) beam manipulations such as spatial scanning have always been the focus in information science and technology. Generally, the transmitting and receiving (T/R) beams of the same aperture should be coincident due to the reciprocal theory, and hence, more flexible controls of the spatial information are limited accordingly. Here, we propose a new approach to achieve independent controls of beam scanning in spatial T/R channels based on one aperture made by a nonreciprocal programmable metasurface. The meta-atom is designed to have independent propagation chains for T/R waves by introducing dual-direction power amplifiers (PAs) as the isolators for one-way transparency. A programmable phase shifter with a 360°coverage is loaded with the PA device in the transmitting or receiving chain to realize independent beam scanning in the T/R channels. A prototype of the proposed metasurface is fabricated, and independent beam scanning in the T/R channels is directly acquired with good performance in our measurements. In addition, a proof of concept of integrated sensing and auxiliary communications is accomplished to verify the validity of the presented method.

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Multiple Orbital Angular Momentum Beams with High‐Purity of Transmission‐Coding Metasurface

Cited by 22 publications

References 44 publications

Transmissive Digital Coding Metasurfaces for Polarization-Dependent Dual-Mode Quad Orbital Angular Momentum Beams

Transmissive Digital Coding Metasurfaces for Polarization-Dependent Dual-Mode Quad Orbital Angular Momentum Beams

Full-Space Wavefront Shaping of Broadband Vortex Beam with Switchable Terahertz Metasurface Based on Vanadium Dioxide

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

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