Opt Express. 2023 Sep 25;31(20):32162-32171. doi: 10.1364/OE.498639.
Food safety is an important consideration for the food industry and for daily life, and food additives are essential in the modern food industry. Graphene-based metamaterial sensors are of great value and have potential applications in the detection of food additives, due to their ultra-sensitivity. This paper proposes a metasurface sensor consisting of graphene and dual elliptical ring resonators (Gr-DERRs) sensor for the detection of two common food additives. The limit of detection (LOD) for Sudan I solution is 581.43 fg/ml and, for taurine, 52.86 fg/ml. This ultra-sensitive detection is achieved by exploiting the unique electromagnetic properties of electromagnetically induced transparency (EIT) resonance, together with the Fermi energy level of graphene moving to the Dirac point, resulting in a dramatic change in the dielectric environment. The Gr-DERRs sensor has brings significant improvement in the detection of food additives with detection limits reduced to the femtogram level.
食品安全是食品工业和日常生活中的一个重要考虑因素，食品添加剂是现代食品工业中必不可少的。基于石墨烯的超材料传感器具有很大的价值，并且由于其超高的灵敏度，在食品添加剂的检测中有潜在的应用。本文提出了一种由石墨烯和双椭圆环谐振器（Gr-DERRs）组成的超表面传感器，用于检测两种常见的食品添加剂。苏丹红 I 溶液的检测限（LOD）为 581.43 fg/ml，牛磺酸为 52.86 fg/ml。这种超灵敏的检测是通过利用电诱导透明（EIT）共振的独特电磁特性以及石墨烯的费米能级移动到狄拉克点来实现的，这导致介电环境发生了剧烈变化。Gr-DERRs 传感器在检测食品添加剂方面带来了显著的改善，检测限降低到飞克级。
