Aflatoxin B1 and B2 are extremely toxic to humans and commonly found in agricultural and food products. Thus, rapid and accurate detection and identification of these substances is essential to prevent human and animal health problems due to their consumption. Here, we present a metamaterial-based terahertz biosensor that has the potential for high-sensitivity, quantitative identification of aflatoxin B1 and B2 in extremely small amounts. By combining with conventional terahertz time-domain spectroscopy and the Maxwell-Garnett effective medium theory, we directly obtained accurate information of the refractive index, absorption coefficient, and dielectric function of these aflatoxins, which are essential parameters to understand their physical properties for their identification. Furthermore, the resonant frequency of the proposed biosensor was in a frequency range wherein the largest difference between the two aflatoxins was observed. In addition, the sensing of aflatoxin B1 an...

中文翻译：

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使用太赫兹时域光谱和基于超材料的太赫兹生物传感器对黄曲霉毒素B1和B2的高灵敏度鉴定

黄曲霉毒素B1和B2对人体有极强的毒性，通常在农产品和食品中发现。因此，对这些物质进行快速，准确的检测和鉴定对于预防由于其消耗而引起的人类和动物健康问题至关重要。在这里，我们介绍了一种基于超材料的太赫兹生物传感器，它具有极高的灵敏度，可定量鉴定黄曲霉毒素B1和B2的极少量。通过结合常规的太赫兹时域光谱和Maxwell-Garnett有效介质理论，我们直接获得了这些黄曲霉毒素的折射率，吸收系数和介电函数的准确信息，这是了解其物理性质以进行鉴定的必不可少的参数。此外，提出的生物传感器的共振频率在一个频率范围内，其中观察到两种黄曲霉毒素之间的最大差异。此外，黄曲霉毒素B1和...的检测