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Monolithic all-silicon flat lens for broadband LWIR imaging

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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Supplementary Material (6)

NameDescription
Supplement 1       Supplementary information
Visualization 1       Soldering iron (color palette: hot).
Visualization 2       Soldering iron (color palette: monochrome).
Visualization 3       Resistor (color palette: hot).
Visualization 4       Resistor (color palette: monochrome).
Visualization 5       Video of soldering iron after image filtering from the MDL-based camera.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (3)

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