Beam scanning of orbital angular momentum electromagnetic wave using annular phased array

2015 ◽  
Author(s):  
Zhiwei Sun ◽  
Shu Wei ◽  
Junming Zhao ◽  
Yijun Feng
Keyword(s):  
Angular Momentum ◽  
Electromagnetic Wave ◽  
Orbital Angular Momentum ◽  
Phased Array ◽  
Beam Scanning

Transmissive 2-bit anisotropic coding metasurface

2022 ◽  
Author(s):  
Pengtao Lai ◽  
Zenglin Li ◽  
Wei Wang ◽  
Jia Qu ◽  
Liang Wei Wu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Electromagnetic Wave ◽  
Circular Polarization ◽  
Orbital Angular Momentum ◽  
Electromagnetic Waves ◽  
Beam Splitter ◽  
Far Field ◽  
Polarization Conversion ◽  
Field Patterns ◽  
Phase Profile

Abstract Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave. However, archiving transmissive coding metasurface is still challenging. Here we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal polarizations. The polarization beam splitter and the OAM generator have been studied as typical applications of anisotropic 2-bit coding metasurface. The simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions, respectively. The anisotropic coding metasurface has been experimentally verified to realize an orbital angular momentum (OAM) beam with l = 2 of right-handed polarized wave, resulting from both contributions from linear-to-circular polarization conversion and the phase profile modulation. This work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.

Radar imaging using electromagnetic wave carrying orbital angular momentum

2017 ◽  
Vol 26 (2) ◽  
pp. 023016 ◽  
Author(s):  
Tiezhu Yuan ◽  
Yongqiang Cheng ◽  
Hongqiang Wang ◽  
Yuliang Qin ◽  
Bo Fan
Keyword(s):  
Angular Momentum ◽  
Electromagnetic Wave ◽  
Orbital Angular Momentum ◽  
Radar Imaging

Research on Vortex Electromagnetic Wave Based on Coding Metasurface

2021 ◽  
Vol 1035 ◽  
pp. 724-731
Author(s):  
Ke Feng Ji ◽  
Jun Gao ◽  
Qi Jun Wu ◽  
Xiang Yu Cao
Keyword(s):  
Genetic Algorithm ◽  
Angular Momentum ◽  
Electromagnetic Wave ◽  
Orbital Angular Momentum ◽  
Wave Energy ◽  
Continuous Phase ◽  
Unit Design ◽  
Momentum Mode ◽  
Coding Unit

The characteristics of vortex electromagnetic wave generated by coding metasurface were studied, and the transmission-type metasurface of vortex wave was designed based on coding unit. It was found that the coding metasurface could replace the quasi-continuous phase to reduce the difficulty of the unit design. But when the orbital angular momentum increased gradually the spacing of two main lobes increased, the side lobes increased, and the vortex waves of other orbital angular momentum reduced. Based on this limitation, this paper optimizes the arrangement of units by genetic algorithm in order to maximize the performance of vortex electromagnetic wave in the limited metasurface size, so that the vortex electromagnetic wave energy is concentrated in the main lobes, thereby enhancing the purity of the orbital angular momentum mode and reducing the electromagnetic wave carrying the orbital angular momentum with other modes, and reduce the main lobes spacing is conducive to propagation. Finally, the feasibility of the method is verified by simulation measurement.

An orbital angular momentum acoustic metasurface for underwater defect detection

2021 ◽  
Author(s):  
Qiujun Ma ◽  
Chunyao Lu ◽  
Igor V. Minin ◽  
Oleg V. Minin ◽  
Kangyu Wang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Defect Detection ◽  
Phased Array ◽  
Simple Structure ◽  
Detection Method ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Reference Library ◽  
Reference Pattern

Abstract Fourier diffraction theorem can rapidly predict scattering characteristics of scatterers. This paper theoretically proposes Orbital Angular Momentum (OAM) to simplify the reference library in the underwater Fourier diffraction theorem. An acoustic metasurface is designed to replace the traditional phased array, meanwhile the underwater defect detection combining OAM and Fourier diffraction theorem is verified in the simulation. This acoustic metasurface has a high signal-to-noise ratio (SNR) when used for underwater defect detection. Compared with the traditional underwater defect detection method, the underwater defect detection method proposed in this paper has the advantages of simple structure and no reference pattern library.

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