Simple terahertz vortex beam generator based on reflective metasurfaces

被引：47

作者：

Li, Jiu-Sheng ^{[1
,2
]}

Zhang, Li-Na ^{[1
]}

机构：

[1] China Jiliang Univ, Ctr THz Res, Hangzhou 310018, Peoples R China

[2] China Jiliang Univ, Coll Informat Engn, Key Lab Electromagnet Wave Informat Technol & Met, Hangzhou 310018, Peoples R China

来源：

OPTICS EXPRESS | 2020年 / 28卷 / 24期

关键词：

Topology - Terahertz waves - Frequency domain analysis;

D O I：

10.1364/OE.410681

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Orbital angular momentum (OAM) is an effective way to increase wireless communication capacity. The existing OAM mainly focuses on the optical and microwave frequency domain. In this letter, a reflective metasurface is proposed to generate an OAM vortex wave beam in the terahertz region with different topological charges. Under illumination of a circular polarized wave, the proposed metasurface generates the deflected OAM vortex wave beam with topological charges of l=+/- 1 and l=+/- 2 at a wide terahertz band from 0.3THz to 0.45THz. The OAM beam has a high mode purity that is larger than 90 % at 0.4THz. Both theoretical prediction and simulated results verify that the designed metasurface can achieve a terahertz vortex wave beam with different OAM topological charges. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：36403 / 36412

页数：10

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