Flexible terahertz metasurface label, detection system and preparation method

The invention discloses a flexible terahertz metasurface label, a detection system and a preparation method, and the metasurface label is of a transmission-type structure and comprises a dielectric layer and a metal pattern layer which is tightly attached to the upper surface of the dielectric layer. The dielectric layer is made of a flexible transparent material; the metal pattern layer comprises at least one resonant ring, when there are multiple resonant rings, the multiple resonant rings are arranged in a nested manner, each resonant ring corresponds to a bit code, and frequency domain coding information is formed by increasing or decreasing the number of the resonant rings; the resonant ring is of a central symmetry structure; when an incident terahertz wave signal inquires the metasurface label, the frequency domain coding information determined by the metasurface label is excited, so that the frequency spectrum structure of the terahertz wave signal is changed. According to the terahertz metasurface ta