基于超表面的超宽带线极化转换特性研究

王玥; 姚震宇; 崔子健; 朱永强; 张达篪; 胡辉; 张狂

doi:10.11999/JEIT220447

基于超表面的超宽带线极化转换特性研究

doi: 10.11999/JEIT220447

1.
西安理工大学陕西省超快光电与太赫兹科学重点实验室西安 710048
2.
哈尔滨工业大学电子信息与工程学院哈尔滨 150001

基金项目: 国家自然科学基金(62275215, 61975163)，陕西省自然科学基金(2020JZ-48)，陕西高校青年创新团队项目(21JP084)

详细信息

作者简介:
王玥：男，教授，研究方向为碳基纳米材料的天线与传播、太赫兹光谱、表面等离子体激元、太赫兹超材料和应用

姚震宇：男，硕士生，研究方向为太赫兹超材料、太赫兹波极化调控、波前调控

崔子健：男，博士生，研究方向为太赫兹超材料吸收体、太赫兹极化转换器和相位梯度超表面

朱永强：男，硕士生，研究方向为太赫兹超材料、机器学习和深度学习在超表面设计中的应用

张达篪：男，硕士生，研究方向为太赫兹超材料、连续体中束缚态

胡辉：男，副教授，研究方向为光电子器件、太赫兹波科学与技术

张狂：男，教授，研究方向为微波技术、超材料器件

通讯作者:
王玥　wangyue2017@xaut.edu.cn

中图分类号: TN015
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- 被引次数: 0
出版历程
- 收稿日期: 2022-04-14
- 修回日期: 2022-09-02
- 网络出版日期: 2022-09-08
- 刊出日期: 2022-12-10

Research on Ultra-wideband Linear Polarization Conversion Characteristics Based on Metasurfaces

1.
Key Laboratory of Ultrafast Photoelectric and Terahertz Science in Shaanxi, Xi’an University of Technology, Xi’an 710048, China
2.
School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China

Funds: The National Natural Science Foundation of China (62275215, 61975163), The Natural Science Foundation of Shaanxi Province (2020JZ-48), The Youth Innovation Team Subject of Shaanxi Universities (21JP084)

摘要

摘要: 极化转换在太赫兹调制领域具有重要的研究意义和应用价值。传统的极化转换器件存在尺寸大、集成度低、损耗高、带宽窄等诸多不足。该文提出一种对称“山”型超表面共振单元结构，可用于实现反射、透射极化转换器件的设计。其中反射型器件实现了极高极化转换率的宽带线极化转换，透射型器件实现了相对带宽达135.5%的超宽带线极化转换。采用各向异性理论分析了反射型器件产生极化转换的机制，并基于多重干涉理论对共振结构阵列与金属背板构成的类F-P腔进行了计算，计算结果与仿真吻合较好。进一步使用正交线栅类F-P腔与共振结构阵列，构成透射型器件，并深入分析了共振单元结构不同部分对宽带极化转换的贡献，讨论了不同结构形成的极化转换频段间的耦合方式。研究结果为基于固定相位差的超宽带偏振极化转换器件的实现以及超表面类F-P腔应用提供了新的思路。
- 超表面 /
- 极化转换 /
- 各向异性 /
- 多重干涉
Abstract: Polarization conversion has important research significance and application value in the field of terahertz modulation. Traditional polarization conversion devices have many shortcomings, such as large size, low integration, high loss and narrow bandwidth. In this paper, a symmetrical "mountain" structure of resonator is proposed, which can be used to realize the design of reflection and transmission polarization conversion devices. The reflective device realizes the linear polarization conversion with the properties of broadband and extremely high polarization conversion rate. The transmissive device realizes 135.5% ultra-broadband linear polarization conversion. The anisotropy theory is used to analyze the mechanism of polarization conversion in reflective devices, and the Fabry-Pérot-like cavity formed by the resonant structure array and the metallized ground plane is calculated based on the multiple interference theory. The calculated results are in good agreement with the simulations. Furthermore, the Fabry-Pérot-like cavity composed of orthogonal grating and the resonator are used to form a transmissive device. The contributions of different parts of the resonator to the broadband polarization conversion are analyzed. Contribution of different structures validates results for broadband polarization conversion. The research results provide a new idea for the realization of ultra-wideband polarization conversion devices based on fixed phase difference and the application of Fabry-Pérot-like cavities in metasurfaces.
- Metasurface /
- Polarization converter /
- Anisotropy /
- Multiple interference

HTML全文

图 1 反射式单元结构、透射式单元结构与共振单元结构的示意图

下载: 全尺寸图片幻灯片

图 2 反射式器件示意图与共极化、交叉极化反射系数及PCR

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图 3 不同频率反射波在不同方向上的反射系数

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图 4 极化转换模型与u轴和v轴入射时电磁波的反射振幅和相位

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图 5 有无金属背板时的反射系数对比图与多重干涉示意图

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图 6 反射型器件共振结构阵列的透射、反射系数及透射、反射相位与多重干涉理论计算结果

下载: 全尺寸图片幻灯片

图 7 透射式器件示意图与交叉极化透射系数、共极化反射系数及PCR

下载: 全尺寸图片幻灯片

图 8 透射型器件共振结构阵列的透射、反射系数及相位与多重干涉理论计算结果

下载: 全尺寸图片幻灯片

图 9 基于不同共振结构阵列设计的极化转换透射系数

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表 1 透射型极化转换器件对比

谐振器几何形状	层数	介质层材料	工作频段	相对带宽(%)	参考文献
条形槽	2	F4B	30～37 GHz	20.1	[29]
垂直条带	2	Taconic TLY-5	15.3～33.1 GHz	70	[30]
圆弧与折线	2	Teflon	6.8～17.32 GHz	87.2	[38]
开口谐振环与H谐振器	3	COC	0.22～1.22 THz	133	[27]
对称“山”型	3	Polyimide	0.495～2.58 THz	135.5	本文

下载: 导出CSV

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