Imaging from the visible to the longwave infrared wavelengths via an inverse-designed flat lens
Optics Express, ISSN: 1094-4087, Vol: 29, Issue: 13, Page: 20715-20723
2021
- 23Citations
- 40Captures
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Article Description
It is generally assumed that correcting chromatic aberrations in imaging requires multiple optical elements. Here, we show that by allowing the phase in the image plane to be a free parameter, it is possible to correct chromatic variation of focal length over an extremely large bandwidth, from the visible (Vis) to the longwave infrared (LWIR) wavelengths using a single diffractive surface, i.e., a flat lens. Specifically, we designed, fabricated and characterized a flat, multi-level diffractive lens (MDL) with a thickness of ≤ 10μm, diameter of ∼1mm, and focal length of 18mm, which was constant over the operating bandwidth of λ=0.45μm (blue) to 15μm (LWIR). We experimentally characterized the point-spread functions, aberrations and imaging performance of cameras comprised of this MDL and appropriate image sensors for λ=0.45μm to 11μm. We further show using simulations that such extreme achromatic MDLs can be achieved even at high numerical apertures (NA=0.81). By drastically increasing the operating bandwidth and eliminating several refractive lenses, our approach enables thinner, lighter and simpler imaging systems.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85108150530&origin=inward; http://dx.doi.org/10.1364/oe.423764; http://www.ncbi.nlm.nih.gov/pubmed/34266154; https://opg.optica.org/abstract.cfm?URI=oe-29-13-20715; https://dx.doi.org/10.1364/oe.423764; https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-13-20715&id=452088
Optica Publishing Group
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