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. 2022 May 3;13:2409. doi: 10.1038/s41467-022-29973-3

Fig. 3. 2-mm-diameter RGB-achromatic polarization-insensitive metalens (NA = 0.7).

Fig. 3

a Optical microscope image of the fabricated device. Scale bar is 100 µm. The inset is the SEM image that corresponds to the region within the white dashed box. Scale bar is 1 µm. b Simulations of the normalized focal intensity along the optical axis (Z) at the three design RGB wavelengths. The inset shows the zoomed-in view of the intensity peaks. c Measured focal intensity distribution in the XZ plane. d Measured focal plane intensity distribution at λ = 488, 532, and 658 nm (from top to bottom, respectively). e Measured focal intensity profile of RGB focal spots. The peak values are normalized according to Airy functions (SI). f Measured focusing efficiency as function of polarization angle of the incident light, showing polarization-insensitive focusing. g–i Imaging results of the element #5 and #6 from the group #7 of the USAF resolution target at λ = 488, 532, and 658 nm, respectively. The scale bar is 10 µm unless noted. j Imaging result under synthesized white light illumination using RGB light.