Given the complex pretreatment and low sensitivity of pesticide residue detection with the conventional testing method, a Terahertz metasensor consisting of the four-division ring resonator (FSRRs) was proposed and fabricated for the identification and detection of chlorothalonil. Through simulations, the theoretical sensitivity of this metasensor was found to reach 156.3 GHz /RIU (RIU, refractive index unit) under an analyte layer 1 μ m thick. Through experiments, firstly, the characteristic fingerprint spectrum of chlorothalonil in the THz band was obtained by detecting solid chlorothalonil with THz time-domain spectrum system. Then, Terahertz metasensor was used to detect the chlorothalonil solutions of different concentrations. The experimental results showed that the resonant peak of the metasensor was redshifted with the increase of chlorothalonil concentration. Compared with the detection strategy only using the characteristic fingerprint spectrum, the sensitivity o...

中文翻译：

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太赫兹元传感器高灵敏度检测百菌清

鉴于传统测试方法的农药残留检测方法复杂且预处理灵敏度低，因此提出了一种由四分区环形共振器（FSRR）组成的太赫兹元传感器，用于百菌清的鉴定和检测。通过模拟，在厚度为1μm的分析物层下，该元传感器的理论灵敏度达到了156.3 GHz / RIU（RIU，折射率单位）。通过实验，首先通过THz时域光谱系统对固体百菌清进行检测，得到了THz谱带中百菌清的特征指纹图谱。然后，使用太赫兹元传感器检测不同浓度的百菌清溶液。实验结果表明，随着百菌清浓度的增加，元传感器的共振峰发生红移。与仅使用特征指纹谱的检测策略相比，其灵敏度更高。