Abstract

We designed, fabricated, and characterized a flat multi-level diffractive lens comprised of only silicon with ${\rm{diameter}} = {15.2}\;{\rm{mm}}$, focal ${\rm{length}} = {{19}}\;{\rm{mm}}$, numerical aperture of 0.371, and operating over the long-wave infrared (LWIR) ${\rm{spectrum}} = {{8}}\;\unicode{x00B5}{\rm m}$ to 14 µm. We experimentally demonstrated a field of view of 46°, depth of focus ${\gt}{{5}}\;{\rm{mm}}$, and wavelength-averaged Strehl ratio of 0.46. All of these metrics were comparable to those of a conventional refractive lens. The active device thickness is only 8 µm, and its weight (including the silicon substrate) is less than 0.2 g.

© 2021 Optical Society of America

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