(a) Electric field distribution in the x–y plane of the chial metasurface on the front and back surfaces with the film thickness d = 10 μm. The arrows indicate the direction of electric field rotating in the metasurface plane with the time varying. (b) Electric field distribution in the x–z plane, where the film thicknesses are 10 μm, (c) 25 μm, and (d) 40 μm, respectively.