Figure 3
From: High-performance gallium nitride dielectric metalenses for imaging in the visible
Characterization of the metalenses. (A) Measurement setup for metalenses characterization. (B–D) Measured focal spots of the metalenses designed at wavelengths of (B) 405, (C) 532, and (D) 633 nm. Scale bar: 5 μm. (E–G) Corresponding horizontal cuts of focal spots with FWHM of 692, 888, and 1058 nm. Dashed lines referring to normalized ideal Airy function. (H–J) Intensity profiles of the metalenses along axial planes designed at wavelengths of (H) 405, (I) 532, and (J) 633 nm.
