基于纤芯反谐振波导的磁控太赫兹偏振转换器  

Magnetically Controlled Terahertz Polarization Converters Based on Core-Antiresonant Waveguide

作　　者：姚瑶 梅养军 劳力 赵佳宇 Yao Yao;Mei Yangjun;Lao Li;Zhao Jiayu(Terahertz Technology Innovation Research Institute,School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Tera Aurora Electro-Optics Technology Co.,Ltd.,Shanghai 200093,China;Shanghai Institute of Intelligent Science and Technology,Tongji University,Shanghai 200093,China)

机构地区：[1]上海理工大学太赫兹技术创新研究院,光电信息与计算机工程学院,上海200093 [2]华太极光光电技术有限公司,上海200093 [3]同济大学上海智能科学与技术研究院,上海200093

出　　处：《中国激光》2024年第18期192-200,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2023YFF0719200,2022YFA1404004);上海市青年科技启明星项目(22QC1400300);国家自然科学基金(61988102,62335012);上海市科委项目(21S31907400)。

摘　　要：太赫兹波的偏振调控(线偏振→椭圆偏振→圆偏振)在太赫兹成像、传感和通信等领域具有巨大的应用需求,近年来吸引了国内外科研人员的关注。然而,目前太赫兹偏振转换器件存在制作工艺复杂、传输效率低下以及无法连续调节等难题。针对上述挑战,本团队基于纤芯反谐振波导,创新性地提出了两种磁控太赫兹偏振转换器。该器件仅需简便的折纸或3D打印技术即可制作,极大地降低了工艺难度。在峰值频率处,该偏振转换波导的传输损耗仅为0.04 cm^(-1),展现出了良好的信号传输效率。最为重要的是,该偏振转换器能够在磁力驱动下实现太赫兹线偏振、椭圆偏振、圆偏振三个偏振态的连续调节与手性切换等功能。上述优良特性使得该器件在太赫兹偏振调控领域具有极大的应用潜力,并有望在多种场景中发挥重要作用,推动太赫兹应用技术的进一步发展。Objective In recent years,terahertz technology has garnered widespread attention and experienced rapid development.Among the key research areas in this field,terahertz polarization control is one of the most significant,as it holds broad application prospects in terahertz imaging,sensing,communication,and radar.Consequently,the efficient manipulation of terahertz polarization states has become a major focus of current research.Although many terahertz polarization conversion devices offer diverse control capabilities,they face challenges in terms of device fabrication complexity,terahertz wave losses,and the ability to continuously modulate polarization states.For example,terahertz polarization converters based on metasurfaces are difficult to fabricate and involve complex manufacturing processes.In addition,these devices often experience significant terahertz losses.In reflective polarization converters,the terahertz wave transmission efficiency can vary from 50%to 80%.More importantly,because most terahertz polarization control devices have a fixed wavefront modulation phase once they are fabricated,they are typically limited to switching between two specific polarization states,such as from linear to circular polarization.Consequently,they often lack the ability to achieve continuous polarization state control.Methods To address the aforementioned challenges,this study innovatively proposes a magnetically controlled terahertz polarization conversion waveguide based on the antiresonance mechanism of the waveguide core.The study first utilized magnetic paper and 3D printing technology to fabricate octagonal paper tube waveguides and U-shaped tube waveguides,which transmit terahertz waves via a core-antiresonance mechanism.Then,when a magnetic field was applied near the output port of the waveguide,the orthogonal inner diameters of the waveguide underwent relative changes.Finally,these changes in the orthogonal inner diameters led to variations in the relative time delay of the orthogonal terahertz polarization co

关 键 词：太赫兹 偏振 调控 纤芯反谐振 

分 类 号：O436[机械工程—光学工程]