超表面太赫兹双频带线极化转换器设计及分析  

Design and Analysis of Metasurface Terahertz Dual-Band Linear Polarization Converter

作　　者：潘武[1] 李永瑞 张彬 李海珠 Pan Wu;Li Yongrui;Zhang Bin;Li Haizhu(College of Photoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《激光与光电子学进展》2023年第19期248-254,共7页Laser & Optoelectronics Progress

摘　　要：提出了一种基于超表面结构的反射式太赫兹双频带线极化转换器,采用典型“三明治”结构,上下两层为金属层,中间层为介质层,实现了线极化波由x极化波到y极化波的有效转换。研究结果表明,该极化转换器在0.611~0.713 THz和1.335~1.364 THz两个频带内极化转换率达到90%以上;在0.626~0.677 THz和1.340~1.360 THz两个频带内极化转换率接近100%,实现了完美的线极化转换。利用表面电流分布,详细阐明了其极化转换机制。基于干涉模型理论进一步计算得到的极化转换率与仿真值吻合。该极化转换器结构设计简单,便于加工,在太赫兹通信、成像和探测领域有着广泛的应用前景。In this study,a reflective terahertz dual-band linear polarization converter based on a metasurface structure is proposed.It adopts a typical“sandwich”structure.The upper and lower layers are metal layers,and the middle layer is a dielectric layer.Efficient conversion of x-polarized waves to y-polarized waves is realized.The results show that the polarization conversion rate of the polarization converter can reach more than 90%in the frequency bands of 0.611-0.713 THz and 1.335-1.364 THz.In the frequency bands of 0.626-0.677 THz and 1.340-1.360 THz,the polarization conversion rate is close to 100%,and perfect linear polarization conversion is realized.Using the surface current distribution,its polarization switching mechanism is elucidated in detail.The polarization conversion rate calculated based on the interference model theory agrees well with the simulation value.The polarization converter has a simple structural design,is easy to process,and has broad application prospects in the fields of terahertz communication,imaging,and detection.

关 键 词：光谱学 太赫兹 超表面 极化转换器 双频带 干涉模型 

分 类 号：TN29[电子电信—物理电子学]