Fullwave Maxwell inverse design of axisymmetric, tunable, and multi-scale multi-wavelength metalenses

Fullwave Maxwell inverse design of axisymmetric, tunable, and multi-scale multi-wavelength metalenses

We demonstrate new axisymmetric inverse-design techniques that can solve problems radically different from traditional lenses, including reconfigurable lenses (that shift a multi-frequency focal spot in response to refractive-index changes) and widely separated multi-wavelength lenses (λ = 1 µm and...

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Bibliographic Details
Main Authors: Christiansen, Rasmus E, Lin, Zin, Roques-Carmes, Charles, Salamin, Yannick, Kooi, Steven E, Joannopoulos, John, Soljacic, Marin, Johnson, Steven G
Other Authors: Massachusetts Institute of Technology. Department of Mathematics
Format: Article
Published: Optical Society of America (OSA) 2020
Online Access:https://hdl.handle.net/1721.1/128249
Description
Summary:We demonstrate new axisymmetric inverse-design techniques that can solve problems radically different from traditional lenses, including reconfigurable lenses (that shift a multi-frequency focal spot in response to refractive-index changes) and widely separated multi-wavelength lenses (λ = 1 µm and 10 µm). We also present experimental validation for an axisymmetric inverse-designed monochrome lens in the near-infrared fabricated via two-photon polymerization. Axisymmetry allows fullwave Maxwell solvers to be scaled up to structures hundreds or even thousands of wavelengths in diameter before requiring domain-decomposition approximations, while multilayer topology optimization with ∼10[superscript 5] degrees of freedom can tackle challenging design problems even when restricted to axisymmetric structures.

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