Figure 5.

Schematic and deflection angles of the metasurface gratings: (a,b) schematic of the broadband achromatic and PB metasurface gratings, respectively; (c,d) far-field intensities of scattered light vs. angle of refraction for the broadband achromatic and PB metasurface gratings, respectively, where the stars in (c,d) represent the theoretically predicted deflection angles; (e) deflection angles of the broadband achromatic and PB metasurface gratings, where the deflection angle is defined as the angle corresponding to the maximum scattering intensities at the different wavelengths.