Deflective Vortex Beam Generation Based on Metasurfaces in the Terahertz Band

被引：0

作者：

Shi H. ^{[1
,2
]}

Li G. ^{[1
,2
]}

Liu K. ^{[3
]}

Li B. ^{[1
,2
]}

Yi J. ^{[2
]}

Zhang A. ^{[2
]}

Xu Z. ^{[1
,4
]}

机构：

[1] MOE Key Laboratory for Multifunctional Materials and Structures, Xi’an Jiaotong University, Xi’an

[2] Branch of Information and Communications Engineering, Faculty of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an

[3] College of Electronic Science and Technology, National University of Defense Technology, Changsha

[4] Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an

来源：

Journal of Radars | 2021年 / 10卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Beam control; Metasurface; Reflectarray; Terahertz; Vortex beam;

D O I：

10.12000/JR21070

中图分类号：

学科分类号：

摘要：

Terahertz vortex beams can be used to improve the communication capacity of radar communication systems and the resolution of imaging systems. This paper presents a deflective vortex beam generation method based on a reflective metasurface working in the terahertz band. Without the limitations of traditional methods, metasurfaces are a good candidate to generate beams carrying an orbital angular momentum in the terahertz band. First, we designed and simulated a unit cell of the metasurface. The unit cell of our design consists of two metallic (gold) layers and one dielectric layer. An almost 360° phase shift was acquired by adjusting the length of the eight stubs of the top layer. The unit cell of the metasurface was simulated by CST Microwave Studio, and the simulation results showed that the co-polarization reflection efficiencies of the unit cells were more than 90%. To avoid performance degradation due to blockage of the feed horn, we controlled accurately the directions of vortex beams based on the concept of reflectarray. To verify the performance of our design, we simulated and measured five reflective metasurfaces. The results of simulation and measurement showed that these metasurfaces could generate five deflective vortex beams in the terahertz band. The topological charges of these beams are ±1, ±2, and 3, which account for the highest energy proportion in different vortex beams. © 2021 Institute of Electronics Chinese Academy of Sciences. All rights reserved.

引用

页码：785 / 793

页数：8

共 29 条

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