基于两相交开口谐振环的超材料太赫兹带阻滤波器  

Metamaterial Terahertz Band-Stop Filter Based on Two Intersecting Split-Ring Resonance

作　　者：袁航 付旺廷 刘祖耀 饶志明[1] 骆兴芳[1] 朱冠华 吴帅克 陈威 Yuan Hang;Fu Wangting;Liu Zuyao;Rao Zhiming;Luo Xingfang;Zhu Guanhua;Wu Shuaike;Chen Wei(College of Physics and Communication Electronics,Jiangxi Normal University,Nanchang 330022,Jiangxi,China)

机构地区：[1]江西师范大学物理与通信电子学院,江西南昌330022

出　　处：《光学学报》2024年第5期112-119,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62065008)。

摘　　要：提出一种基于两相交开口谐振环(TI-SRR)的超材料太赫兹带阻滤波器,通过改变TI-SRR线宽、环间间隔和半径大小,探究各参数对滤波器透射系数的影响。研究了超材料太赫兹带阻滤波器三个谐振点处的电场和表面电流分布,进而分析了滤波器的工作机理。为了验证理论模型的计算结果,采用微纳光刻技术制备滤波器的实物样品,使用太赫兹时域光谱系统进行测试。结果表明,该滤波器有3个谐振点,谐振频率分别为0.431、0.476、0.934 THz,对应的透射系数(S21)分别为-42.518、-40.331、-14.132 dB,-10 dB阻带带宽分别为0.220 THz和0.026 THz。实测曲线整体趋势与仿真曲线保持一致,阻带特性相较良好,测试结果与仿真结果较为符合。该滤波器在新型通信设备和精密仪器领域有较高的应用价值。Objective Terahertz filter is an important functional device for realizing terahertz imaging,terahertz communication,and other terahertz application technologies,and in-depth study of terahertz filters plays a great role in promoting the development of terahertz technologies.Therefore,the design of terahertz filters with a wide range of adjustable center frequency,sensitive bandwidth adjustment,deep modulation depth,simple structure,and multi-band transmission performance has become an urgent problem.In this study,a metamaterial terahertz band-stop filter based on two intersecting split-ring resonance(TI-SRR)is designed.It can effectively expand the bandwidth adjustment range,adjust the center frequency,reduce the transmittance,and make the stopband attenuate rapidly.At the same time,it has multiband filtering and is easy to fabricate and process.The metamaterial terahertz band-stop filter has high application value in the field of new communication equipment and precision instruments.Methods In this experiment,the effect of each parameter on the performance of the filter is investigated by varying the line width,inter-ring spacing,and radius size of the TI-SRR.The transmission coefficients of the filter under each parameter are compared,and the design scheme with the best performance is summarized.The electric field and surface current distributions at the three resonance points of the metamaterial band-stop filter are analyzed,so as to investigate the working mechanism of the filter.In order to verify the calculation results of the theoretical model,physical samples of the filter are prepared by micro-nanolithography and tested using a terahertz time-domain spectroscopy(THz-TDS)system.The results of the actual measurement and simulation are compared to find the cause of the error.Results and Discussions Simulation experiments are carried out on several parameters of the metamaterial terahertz bandstop filter,while other parameters are kept unchanged.When the line width w gradually increases from 2 to 14μm,the

关 键 词：超材料 太赫兹 带阻滤波器 微纳光刻 太赫兹时域光谱 

分 类 号：TN713.5[电子电信—电路与系统]