Metamaterial chip for detecting two food additives based on terahertz fingerprint spectra

The invention belongs to the field of terahertz metamaterial sensing, and particularly relates to a metamaterial chip for detecting two food additives based on terahertz fingerprint spectra. The metamaterial chip comprises a plurality of periodically arranged unit structures, each unit structure comprises a substrate layer and a metal layer, and the metal layer is located on the top surface of the substrate layer; and each metal layer comprises a first metal metamaterial layer, a second metal metamaterial layer and a third metal metamaterial layer, the first metal metamaterial layer, the second metal metamaterial layer and the third metal metamaterial layer are located in the center of the top surface of the substrate layer and are concentrically arranged, and the outer diameters of the first metal metamaterial layer, the second metal metamaterial layer and the third metal metamaterial layer are sequentially increased. The chip has the advantages of convenience in operation, simplicity in manufacturing, small