Guided-Wave Inspired Metasurfaces for Multifunctional Vortex Beam Generation and Manipulation

Shi, Hongyu; Wang, Luyi; Li, Guoqiang; Yi, Jianjia; Liu, Haiwen; Zhang, Anxue; Xu, Zhuo

doi:10.1109/jlt.2022.3213850

Cited by 10 publications

(3 citation statements)

References 121 publications

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“…In addition, the working bandwidth of reconfigurable metasurfaces is narrow because the reflected response originates from electromagnetic resonance. Some non-resonant metasurfaces were proposed to broaden the bandwidth [ 278 ]. Researchers are making efforts for metasurfaces with high performance.…”

Section: The Development In the Futurementioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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Metasurfaces have shown their great capability to manipulate electromagnetic waves. As a new concept, reconfigurable metasurfaces attract researchers’ attention. There are many kinds of reconfigurable components, devices and materials that can be loaded on metasurfaces. When cooperating with reconfigurable structures, dynamic control of the responses of metasurfaces are realized under external excitations, offering new opportunities to manipulate electromagnetic waves dynamically. This review introduces some common methods to design reconfigurable metasurfaces classified by the techniques they use, such as special materials, semiconductor components and mechanical devices. Specifically, this review provides a comparison among all the methods mentioned and discusses their pros and cons. Finally, based on the unsolved problems in the designs and applications, the challenges and possible developments in the future are discussed.

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Section: The Development In the Futurementioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

Self Cite

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“…The resonant frequency can represent the oscillation state of electromagnetic waves in the coaxial resonant cavity and can also give the prerequisite for resonance in the cavity, that is, the frequency selection characteristics of the coaxial resonator. The guide wave equation of the coaxial resonant cavity is solved to obtain the expression of the guided wave: (11,12)…”

Section: Resonant Frequencymentioning

confidence: 99%

Microwave-cavity-based Online Moisture Sensing for Concrete Fabrication

Liu¹,

Zhang²,

Wang³

et al. 2023

Sensors and Materials

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Moisture content is critical to concrete fabrication. Currently, concrete fabrication often involves experienced workers who can gauge whether the water volume is sufficient. This active human involvement requires appearance or thickness checks, which is not suitable for mass production. This method cannot also tell the actual moisture content. Moreover, different workers may give different assessments for the same concrete, which may further lead to different strengths of concrete. Thus, we propose and design a microwave-cavity-based online moisture sensing system to monitor concrete fabrication. Our system utilizes a microwave resonator as a front-end sensor to monitor moisture. This resonator is sensitive to the dielectric coefficient of a particular object. This dielectric coefficient of concrete notably changes when the water yield varies and hence can be readily detected. With this sensitive resonator, we built an online moisture-sensing system. Our prototype achieves moisture sensing with an error of as low as 0.5% and can check moisture content twice a second.

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“…This unique property dramatically increases the channel capacity and spectral efficiency within a single communication channel through the OAM multiplexing. Currently, various methods have been employed to generate vortex beams with diverse topological charges [6]. For instance, a polyethylene spiral phase plate has been developed to generate a vortex beam by introducing different transmission phase delays [7].…”

Section: Introductionmentioning

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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Guided-Wave Inspired Metasurfaces for Multifunctional Vortex Beam Generation and Manipulation

Cited by 10 publications

References 121 publications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Microwave-cavity-based Online Moisture Sensing for Concrete Fabrication

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

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