Broadband vortex beam generating for multi‐polarisations based on a single‐layer quasi‐spiral metasurface

Wang, Lingling; Liu, Shaobin; Kong, Xiangkun; Wen, Yongdiao; Liu, Xiaochun

doi:10.1049/el.2019.1752

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…A typical characteristic of a vortex beam is that it has a spatially distributed spiral phase term e ilϕ , where l denotes the designed OAM mode number, also known as the number of topological changes, and ϕ denotes the azimuthal angle. [50][51][52] The overall size of the two designed reflective metasurfaces is set to 720 × 720 µm 2 , and they consist of an array of 20 × 20 cells. For the OAM mode l = 1, the metasurface consists of eight sectors, and the phase gradient increment between adjacent sectors is 45 • , as shown in Fig.…”

Section: The 3-bit Coding Metasurfacementioning

confidence: 99%

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

Qi¹,

Zhang²,

Ding³

et al. 2020

Chinese Phys. B

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Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band, in this paper, we use the Pancharatnam-Berry (PB) phase concept to propose a high-efficiency reflectivetype coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel functionalities. By optimizing the coding sequences, we demonstrate that the designed 1-, 2-, and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz waves. The two proposed 1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily controlled. For normally incident x-and y-polarized waves, a 10 dB radar cross-section (RCS) reduction can be achieved from 2.1 THz to 5.2 THz using the designed 2-bit coding metasurface. Moreover, two kinds of orbital angular momentum (OAM) vortex beams with different moduli are generated by a coding metasurface using different coding sequences. Our research provides a new degree of freedom for the sophisticated manipulation of terahertz waves, and contributes to the development of metasurfaces towards practical applications.

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Section: The 3-bit Coding Metasurfacementioning

confidence: 99%

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

Qi¹,

Zhang²,

Ding³

et al. 2020

Chinese Phys. B

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show abstract

“…Generally, the electromagnetic properties of the metasurface are determined by the performances of unit cells [111]. To design broadband metasurface, the unit cells should obtain wideband characteristics [112][113][114][115]. For example, dual layers with orthogonal structure and five symmetric parallel dipoles, as illustrated in Figure 13(b), were adapted to stimulate multiple independent operating modes [116].…”

Section: Multiple Modes or Reconfigurationmentioning

confidence: 99%

Recent progress on RF orbital angular momentum antennas

Guo

Yang

et al. 2020

Journal of Electromagnetic Waves and Applications

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In the last five years or so, there has been a great interest in RF OAM to address the contradiction between the lack of wireless spectrum resources and the continually growing demands of the bandwidth. Recent developments and technological advancements in antenna design, material science, and integrated circuits have enabled miniaturized, multiple modes, tunable in radio frequency (RF) orbital angular momentum (OAM) antenna designs. From conventional methods such as spiral phase plate and reflector antenna to antenna array and metasurface, the working principle and structures are introduced. To improve the performance of RF OAM antennas, several innovative physical concepts, including multiple-input multiple-output, circular polarization rotation, PIN diodes dynamic regulation, and so on have been explored for the designs of RF OAM antenna designs. In this paper, we present an up-to-date survey on the development of RF OAM antenna technologies. We provide details on structure designs and theoretical analyses. The evaluate method and advantage analyses are also included. Open issues and development trends are explored as a source of inspiration towards the future better outcome of RF OAM antenna designs.

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“…Based on the structural parameter method, the researchers have achieved fruitful results [18][19][20][21]. In 2016, Yu et al designed a vortex metasurface using a three-oscillator antenna to realize the vortex electromagnetic wave [22] at the 5.8 GHz frequency.…”

Section: Introductionmentioning

confidence: 99%

A reflective metasurface for broadband OAM vortex wave generation

Zhang

Li²,

Lin³

et al. 2022

Front. Phys.

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In this paper, we proposed a reflective metasurface which controls the phase delay of the electromagnetic (EM) wave through geometric phase manipulation. By coding the metasurface unit cells in different orientation angles, an orbital angular momentum (OAM) wave can be obtained through the metasurface reflection. A broadband reflective OAM wave with mode l = −1 was demonstrated which was experimentally observed from 8.3 GHz to 11.6 GHz. The mode spectrum of OAM wave was analyzed and the spectrum weight was about 0.82 through numerical calculation and about 0.47 through experimental measurement for the mode l = −1. The realization of this broadband OAM wave has the potential application to improve the OAM wave based communication capacity.

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Broadband vortex beam generating for multi‐polarisations based on a single‐layer quasi‐spiral metasurface

Cited by 6 publications

References 9 publications

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

Recent progress on RF orbital angular momentum antennas

A reflective metasurface for broadband OAM vortex wave generation

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