Journal
NANOPHOTONICS
Volume 11, Issue 11, Pages 2531-2540Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0431
Keywords
diffractive lenses; metamaterials; subwavelength structures
Categories
Funding
- NSF [1825308]
- DARPA [140D0420C0060]
- Washington Research Foundation distin guished investigator award
- IBM Research
- MIT-IBM Watson AI Laboratory
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies [W911NF13-D-0001]
- National Science Foundation [NNCI-2025489, NNCI-1542101]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1825308] Funding Source: National Science Foundation
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The inverse-designed, high numerical aperture, extended depth of focus meta-optic with lens-like point spread function maintains focusing efficiency comparable to a hyperboloid metalens throughout its depth of focus. It demonstrates broadband imaging across the full visible spectrum and exhibits highly invariant point spread function across a broad optical bandwidth, leading to significantly improved image quality.
We report an inverse-designed, high numerical aperture (similar to 0.44), extended depth of focus (EDOF) meta-optic, which exhibits a lens-like point spread function (PSF). The EDOF meta-optic maintains a focusing efficiency comparable to that of a hyperboloid metalens throughout its depth of focus. Exploiting the extended depth of focus and computational post processing, we demonstrate broadband imaging across the full visible spectrum using a 1 mm, f/1 meta-optic. Unlike other canonical EDOF meta-optics, characterized by phase masks such as a log-asphere or cubic function, our design exhibits a highly invariant PSF across similar to 290 nm optical bandwidth, which leads to significantly improved image quality, as quantified by structural similarity metrics.
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