Fig. 2.

Metalens design and fabrication. Top–down images of: a the discretized Fresnel phase profile used for the design; b SEM image of the fabricated structure, c bright-field reflection optical image of the metalens surface; d image of a macroscopic chromium shadow mask with the Quantum Engineering Lab logo, 〈Q|E|L〉, formed through the metalens in a bright-field transmission microscope. Red, dashed lines indicate the effective aperture of the metalens. All scale bars denote 5 μm. Reflected light from the planar diamond surface surrounding the metalens in c saturated the camera, making it appear white