Abstract

Compound eyes found in insects provide intriguing sources of biological inspiration for miniaturized imaging systems. Inspired by such insect eye structures, we demonstrate an ultrathin arrayed camera enabled by a flat multi-level diffractive microlens array for super-resolution visible imaging. We experimentally demonstrate that the microlens array can achieve a large fill factor (hexagonal close packing with ${\rm{pitch}} = {{120}}\;{{\unicode{x00B5}{\rm m}}}$), thickness of 2.6 µm, and diffraction-limited (${\rm{Strehl}}\;{\rm{ratio}} = {0.88}$) achromatic performance in the visible band (450 to 650 nm). We also demonstrate super-resolution imaging with resolution improvement of ${\sim}{1.4}$ times by computationally merging 1600 images in the array.

© 2020 Optical Society of America

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