Terahertz toroidal dipole metamaterial sensors for detection of aflatoxin B1  

作　　者：徐建伟 欧阳收剑 段守鑫 邹林儿 叶丹妮 杨思嘉 邓晓华 Jianwei Xu;Shoujian Ouyang;Shouxin Duan;Liner Zou;Danni Ye;Sijia Yang;Xiaohua Deng(Department of Physics,School of Physics and Materials Science,Nanchang University,Nanchang 330031,China;Department of Measuring and Controlling Technology and Instrument,Institute of Advanced Manufacturing,Nanchang University,Nanchang 330031,China;Institute of Space Science and Technology,Nanchang University,Nanchang 330031,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第3期672-676,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61927813,61865009,and 12104203);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 0.001μg·ml-1 and to 0.01μg·ml-1,respectively.Furthermore,when aflatoxin B1 concentrations are 0.1μg·ml-1,1μg·ml-1,10μg·ml-1 and 100μg·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 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]