(a) Schematic diagram of the proposed chiral metasurface and THz experimental configuration. (b) Schematic diagram of the THz-TDS system. (c) Geometry of the metasurface. Micrographs of the fabricated metasurface with (d) single layer and (e) double-layer. (f) Relationship between the spin speed and film thickness (the square points are the ideal film thickness, and the upper and lower horizontal short lines are the error ranges for multiple measurments).