Imidacloprid has been widely used in crop pest control and disease resistance, the highly sensitive detection of imidacloprid concentration is strongly demanded in the field of food safety and the other fields. In this paper, a method to determine the concentration of imidacloprid by using the tablet instead of the liquid on a terahertz metamaterial sensor is proposed, which could avoid the influence of the water absorption in the terahertz band. The physical mechanism of the biosensing performance is verified theoretically and experimentally. It is found that the resonant frequency of the metamaterial has a red shift as the concentration of the imidacloprid tablet increases. The frequency shift is caused by the different concentrations as well as the refractive index of the imidacloprid tablet. The calculated sensitivity is 275.86 GHz/RIU and the figure of merit is 9.61. The proposed method would have important applications in the food safety industry.

中文翻译：

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用于吡虫啉检测的太赫兹超材料传感器

吡虫啉在作物病虫害防治和抗病领域得到广泛应用，食品安全等领域对吡虫啉浓度的高灵敏度检测有着强烈的需求。本文提出了一种利用片剂代替液体在太赫兹超材料传感器上测定吡虫啉浓度的方法，该方法可以避免太赫兹波段吸水率的影响。通过理论和实验验证了生物传感性能的物理机制。发现随着吡虫啉片浓度的增加，超材料的共振频率发生红移。频移是由吡虫啉片剂的不同浓度和折射率引起的。计算出的灵敏度为 275。86 GHz/RIU 和品质因数是 9.61。所提出的方法将在食品安全行业中具有重要的应用。