测试科学与仪器2026，Vol.17Issue(2)：297-306,10.DOI:10.62756/jmsi.1674-8042.2026025
基于四嵌套圆环超表面吸波体的高灵敏度太赫兹传感器
High-sensitivity terahertz sensor based on four-nested ring metasurface absorber
摘要
Abstract
Terahertz(THz)waves exhibit distinctive advantages for biomedical sensing,while metasurface technology offers an effective route toward high-performance THz sensors.A high-sensitivity THz metasurface absorber sensor for biological sample detection is proposed and numerically investigated.The sensor adopts a metal-insulator-metal(MIM)configuration,in which four centrosymmetrically arranged split metal rings form a multimode resonator.Copper is employed as the metallic layer,and PTFE is selected as the dielectric spacer.The electromagnetic response of the sensor is analyzed using CST Microwave Studio based on the FIT.Simulation results demonstrate that the proposed sensor supports two independent near-perfect absorption resonances at 3.156 4 THz and 3.724 THz,with peak absorption rates of 99.75%and 99.84%,respectively.Owing to the strong localized field enhancement and multimode coupling effects,the resonant frequencies exhibit pronounced sensitivity to variations in the surrounding refractive index.Within the typical refractive-index range of biomedical samples,the maximum sensitivity reaches 241 GHz/RIU,accompanied by a maximum figure of merit(FOM)of 8.02.In addition,the absorption performance remains above 99%for polarization angles from 0° to 90°,with negligible resonance shift,indicating excellent polarization insensitivity.Benefiting from the use of low-dielectric-constant materials,the proposed sensor showed good material compatibility and portability.These results suggested that the designed metasurface absorber provided a promising platform for high-sensitivity terahertz biosensing applications.关键词
金属-绝缘体-金属结构/双频共振/折射率传感/极化不敏感/生物医学检测/等效电路模型Key words
metal-insulator-metal(MIM)configuration/dual-band resonance/refractive index sensing/polarization insensitivity/biomedical detection/equivalent circuit model引用本文复制引用
武慧嘉,郝亚峰,朱璞,马富鹏,黄育杰,牛文宇,李仕奇,桑鲁骁,李腾腾..基于四嵌套圆环超表面吸波体的高灵敏度太赫兹传感器[J].测试科学与仪器,2026,17(2):297-306,10.基金项目
This work was supported by the National Natural Science Foundation of China(Nos.62301509,62405293),the Key Research and Development Program of Shanxi Province(No.202302030201001),the Fundamental Research Program of Shanxi Province(No.202303021212191)and General Project of China Postdoctoral Science Foundation(No.2025M770537). （Nos.62301509,62405293）
