The measured far-field intensity distribution of the spin-flip component from a circular chain of ordered nanoholes (a) and rotating nanorods (b). Reprinted from reference [105] with permission. (c) Measured far-field optical vortex beams generated with array of nano waveguides filled with PMMA. Inset shows the SEM image of the structure. Reprinted from reference [106] with permission. (d) Generation of light with radial polarization with a metasurface. Inset show the schematic of the structure. Reprinted from reference [107] with permission.