中国物理B ›› 2024, Vol. 33 ›› Issue (3): 38701-038701.doi: 10.1088/1674-1056/acef02

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Terahertz toroidal dipole metamaterial sensors for detection of aflatoxin B1

Jianwei Xu(徐建伟)1, Shoujian Ouyang(欧阳收剑)1, Shouxin Duan(段守鑫)1, Liner Zou(邹林儿)1, Danni Ye(叶丹妮)2,†, Sijia Yang(杨思嘉)3,‡, and Xiaohua Deng(邓晓华)3   

  1. 1 Department of Physics, School of Physics and Materials Science, Nanchang University, Nanchang 330031, China;
    2 Department of Measuring and Controlling Technology and Instrument, Institute of Advanced Manufacturing, Nanchang University, Nanchang 330031, China;
    3 Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China
  • 收稿日期:2023-04-13 修回日期:2023-07-28 接受日期:2023-08-11 出版日期:2024-02-22 发布日期:2024-02-22
  • 通讯作者: Danni Ye, Sijia Yang E-mail:862090721@qq.com;sjyang@ncu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61927813, 61865009, and 12104203) and Jiangxi Provincial Natural Science Foundation (Grant No. 20212ACB201007).

Terahertz toroidal dipole metamaterial sensors for detection of aflatoxin B1

Jianwei Xu(徐建伟)1, Shoujian Ouyang(欧阳收剑)1, Shouxin Duan(段守鑫)1, Liner Zou(邹林儿)1, Danni Ye(叶丹妮)2,†, Sijia Yang(杨思嘉)3,‡, and Xiaohua Deng(邓晓华)3   

  1. 1 Department of Physics, School of Physics and Materials Science, Nanchang University, Nanchang 330031, China;
    2 Department of Measuring and Controlling Technology and Instrument, Institute of Advanced Manufacturing, Nanchang University, Nanchang 330031, China;
    3 Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China
  • Received:2023-04-13 Revised:2023-07-28 Accepted:2023-08-11 Online:2024-02-22 Published:2024-02-22
  • Contact: Danni Ye, Sijia Yang E-mail:862090721@qq.com;sjyang@ncu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61927813, 61865009, and 12104203) and Jiangxi Provincial Natural Science Foundation (Grant No. 20212ACB201007).

摘要: Terahertz metamaterial biosensors have attracted significant attention in the biological field due to their advantages of label-free, real-time and in situ detection. In this paper, a highly sensitive metamaterial sensor with semi-ring mirror symmetry based on toroidal dipole resonance is designed for a new metamaterial biosensor. It is shown that a refractive index sensitivity of 337.5 GHz per refractive index unit can be achieved under an analyte of saturated thickness near a 1.33 THz transmission dip. For biosensor samples where aflatoxin B1 is dropped on the metamaterial surface in our experiment, dip amplitudes of transmission varying from 0.1904 to 0.203 and 0.2093 are observed as aflatoxin B1 concentrations are altered from 0 to 0.001 μg·ml-1 and to 0.01 μg·ml-1, respectively. Furthermore, when aflatoxin B1 concentrations are 0.1 μg·ml-1, 1 μg·ml-1, 10 μg·ml-1 and 100 μg·ml-1, dip amplitudes of 0.2179, 0.226, 0.2384 and 0.2527 and dip redshifts of 10.1 GHz, 20.1 GHz, 27.7 GHz and 37.6 GHz are respectively observed. These results illustrate high-sensitivity, label-free detection of aflatoxin B1, enriching the applications of sensors in the terahertz domain.

关键词: terahertz, metamaterial, toroidal dipole, aflatoxin B1

Abstract: Terahertz metamaterial biosensors have attracted significant attention in the biological field due to their advantages of label-free, real-time and in situ detection. In this paper, a highly sensitive metamaterial sensor with semi-ring mirror symmetry based on toroidal dipole resonance is designed for a new metamaterial biosensor. It is shown that a refractive index sensitivity of 337.5 GHz per refractive index unit can be achieved under an analyte of saturated thickness near a 1.33 THz transmission dip. For biosensor samples where aflatoxin B1 is dropped on the metamaterial surface in our experiment, dip amplitudes of transmission varying from 0.1904 to 0.203 and 0.2093 are observed as aflatoxin B1 concentrations are altered from 0 to 0.001 μg·ml-1 and to 0.01 μg·ml-1, respectively. Furthermore, when aflatoxin B1 concentrations are 0.1 μg·ml-1, 1 μg·ml-1, 10 μg·ml-1 and 100 μg·ml-1, dip amplitudes of 0.2179, 0.226, 0.2384 and 0.2527 and dip redshifts of 10.1 GHz, 20.1 GHz, 27.7 GHz and 37.6 GHz are respectively observed. These results illustrate high-sensitivity, label-free detection of aflatoxin B1, enriching the applications of sensors in the terahertz domain.

Key words: terahertz, metamaterial, toroidal dipole, aflatoxin B1

中图分类号: 

  • 87.50.U-
78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 87.85.fk (Biosensors)