FIG. 3.
Grayscale metasurface and chiral transformation. (a, b) Required phase shifts, ψx (top) and rotation angle, Θ (bottom) as a function of the intensity ∣U±(x,y)∣2 of incident wave. (c, d) Experimentally measured intensity distributions for LCP and RCP light at the wavelength of 550 nm. (e, f) The corresponding quantitative results along the horizontal direction of the device. The uncertainties are standard deviation of light intensity for repeated experimental measurements (five in total).