Fig. 4: The spectral light-field imaging of metalens array.

a, b Different view of the scene that consists of four letters with different color at different spatial positions. c The raw data of the SLIM system. The inset is the Zoomed-in images of area inside the red box. d The all focused rendered color image. Rendered images with focusing depths of 69.8 cm (e), 57.3 cm (f), 45.1 cm (g) and 37.8 cm (h). i–l Spectra of four letters. The red dot lines are the spectra reconstructed from the metalens array, and the gray dot lines are measured by commercial spectrometer.