Journal article
Monjurul Meem, Apratim Majumder, Sourangsu Banerji, Juan C. Garcia, Orrin Kigner, P. Hon, B. Sensale‐Rodriguez, R. Menon
Optics Express, 2020
Optics Express, 2020
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Meem, M., Majumder, A., Banerji, S., Garcia, J. C., Kigner, O., Hon, P., … Menon, R. (2020). Imaging from the visible to the longwave infrared wavelengths via an inverse-designed flat lens. Optics Express.
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Meem, Monjurul, Apratim Majumder, Sourangsu Banerji, Juan C. Garcia, Orrin Kigner, P. Hon, B. Sensale‐Rodriguez, and R. Menon. “Imaging from the Visible to the Longwave Infrared Wavelengths via an Inverse-Designed Flat Lens.” Optics Express (2020).
MLA
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Meem, Monjurul, et al. “Imaging from the Visible to the Longwave Infrared Wavelengths via an Inverse-Designed Flat Lens.” Optics Express, 2020.
BibTeX Click to copy
@article{monjurul2020a,
title = {Imaging from the visible to the longwave infrared wavelengths via an inverse-designed flat lens.},
year = {2020},
journal = {Optics Express},
author = {Meem, Monjurul and Majumder, Apratim and Banerji, Sourangsu and Garcia, Juan C. and Kigner, Orrin and Hon, P. and Sensale‐Rodriguez, B. and Menon, R.}
}
Abstract
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.