Fig. 6: Analysis of metasurface spectrometer with 180 focal points under polychromatic light beams.

a Simulation and experimental results under a combination of blue, red, and green wavelengths. b Normalized intensity distribution on the ring corresponding to the simulation result in (a). c Simulation results with the consideration of visual efficiencies of the wavelengths. d Normalized intensity distribution on the ring corresponding to the experimental result in (a). The measured values of peak intensities yield central wavelengths of 511.1 nm, 581.6 nm, and 633.4 nm for the input wavelengths of 510 nm, 581 nm, and 633 nm, respectively