Fig. 3. Experimental results of multifunctional meta-optics devised by a multilayer approach (a–f) and a multi-perturbation approach (g–n).

a Schematic illustrating the multilayer approach with a cylindrical lens with NA = 0.1 made from the meta-unit library in Fig. S6 as the converging element and the radial lens from Fig. 2 as the diverging element. Photographs of the diverging (b) and converging (c) elements of the doublet. SEM images of the diverging (d) and converging (e) elements. Arrows indicate phase gradient direction. f Measured transverse intensity distributions of transmitted light of converted handedness of the doublet. g Schematic illustrating the multi-perturbation approach for a dual-function cylindrical lens. h Optical image of the device. SEM images of the device at the center (i) and corner (j) of the device. k Schematic of a meta-unit of the dual-function cylindrical lens. Shown are two sets of apertures (colored red and blue) defined in a silicon thin film A_{x y}. l Simulated transmission spectra of light with converted (red) and preserved (black) handedness. Insets: Out-of-plane component of electric field for the two modes. m Geometric phases of both modes as a function of in-plane rotation angle of the blue (top) and red (bottom) perturbations, respectively. n Measured transverse intensity distributions of handedness converted light on the focal plane of the dual-function cylindrical lens. Device dimensions are detailed in Table S1