Fig. 5. Broadband polarization-maintaining properties of the nondispersive metasurface.
(A to I) Measured holographic images with the incident wavelength from 475 to 675 nm (left: without analyzer; right: with broadband quarter waveplate at θλ/4 = 67.5° and linear polarizer (LP) at θLP = 49.07° to block the holographic images). The holographic images in the right panels are almost totally blocked in the entire visible range, confirming the exceptional broadband response of out polarization–maintaining design approach. (J) Measured SoP at different wavelengths agrees well to the designed value in Fig. 2G. (K) Measured efficiency is higher than 10% across the entire visible range.