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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 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 |
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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.
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Received: 13 April 2023
Revised: 28 July 2023
Accepted manuscript online: 11 August 2023
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PACS:
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87.50.U-
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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87.85.fk
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(Biosensors)
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| Fund: 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). |
Corresponding Authors:
Danni Ye, Sijia Yang
E-mail: 862090721@qq.com;sjyang@ncu.edu.cn
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Cite this article:
Jianwei Xu(徐建伟), Shoujian Ouyang(欧阳收剑), Shouxin Duan(段守鑫), Liner Zou(邹林儿), Danni Ye(叶丹妮), Sijia Yang(杨思嘉), and Xiaohua Deng(邓晓华) Terahertz toroidal dipole metamaterial sensors for detection of aflatoxin B1 2024 Chin. Phys. B 33 038701
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