Transcending shift-invariance in the paraxial regime via end-to-end inverse design of freeform nanophotonics
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Transcending_shift_invariance_in_the_paraxial_regime_via_end_to_end_inverse_design_of_freeform_nanophotonics.pdf
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4.88 MB
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Author(s)
Li, William F.
Arya, Gaurav
Roques-Carmes, Charles
Lin, Zin
Johnson, Steven G.
Soljačić, Marin
Date Issued
July 10, 2023
Journal
Optics Express
Publisher
Optica Publishing Group
Citation
Li, William F., Arya, Gaurav, Roques-Carmes, Charles, Lin, Zin, Johnson, Steven G. et al. 2023. "Transcending shift-invariance in the paraxial regime via end-to-end inverse design of freeform nanophotonics." Optics Express, 31 (15).
Version
Author's final manuscript
Abstract
Traditional optical elements and conventional metasurfaces obey shift-invariance in the paraxial regime. For imaging systems obeying paraxial shift-invariance, a small shift in input angle causes a corresponding shift in the sensor image. Shift-invariance has deep implications for the design and functionality of optical devices, such as the necessity of free space between components (as in compound objectives made of several curved surfaces). We present a method for nanophotonic inverse design of compact imaging systems whose resolution is not constrained by paraxial shift-invariance. Our method is end-to-end, in that it integrates density-based full-Maxwell topology optimization with a fully iterative elastic-net reconstruction algorithm. By the design of nanophotonic structures that scatter light in a non-shift-invariant manner, our optimized nanophotonic imaging system overcomes the limitations of paraxial shift-invariance, achieving accurate, noise-robust image reconstruction beyond shift-invariant resolution.
Subjects
Atomic and Molecular Physics, and Optics
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1364/oe.492553
