Fig. 5: Experimental demonstration of an angle-multiplexed meta-polarizer.

a Side-view schematic (left) and top-view SEM image (right) of the designed/fabricated metasurface. b FEM-simulated reflection-phase difference between TE and TM polarizations versus wavelength and incident angle. Inset: TE–TM reflection phase difference versus incident angle, obtained by FEM simulations at the wavelength of 1358 nm (corresponding to the red dashed line), implying that the reflected beam can exhibit different polarization states. c, d Measured and simulated reflectance spectra of the fabricated meta-device illuminated by TE- and TM-polarized light at different incident angles. e Normalized power patterns of the metasurface-reflected light filtered by a linear polarizer with rotating polarization direction, obtained by experiments and simulations at the wavelength of 1358 nm under different excitation light incident angles. The geometrical parameters of the meta-device are P_x = P_y = 280 nm, L_x = 250 nm, L_y = 50 nm, t = 30 nm, t_s = 50 nm and t_m = 150 nm