Fig. 3.

A sub-wavelength dielectric waveguide coated by a single-layer twisting metasurface. a Configuration and snapshots of the vector electric field distribution at 3.45 GHz in the x-y plane at seven different positions along the axis of the rod when excited by an x polarized probe. Sections A and C contain unit cells near the two ends, while section B contains unit cells in the center. b Measured and simulated co-polarized (T _xx) and cross-polarized (T _yx) transmission between the transmitting and receiving probes. c Measured state-of-polarization patterns of the Teflon rod waveguide coated by the metasurface guiding layer with and without twisting perturbation at different frequencies. d Measured rotation angle and the rotation angle per wavelength as a function of frequency