@article{21637,
  abstract     = {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 ∼105 degrees of freedom can tackle challenging design problems even when restricted to axisymmetric structures.},
  author       = {Christiansen, Rasmus E. and Lin, Zin and Roques-Carmes, Charles and Salamin, Yannick and Kooi, Steven E. and Joannopoulos, John D. and Soljačić, Marin and Johnson, Steven G.},
  issn         = {1094-4087},
  journal      = {Optics Express},
  number       = {23},
  pages        = {33854--33868},
  publisher    = {Optica Publishing Group},
  title        = {{Fullwave Maxwell inverse design of axisymmetric, tunable, and multi-scale multi-wavelength metalenses}},
  doi          = {10.1364/oe.403192},
  volume       = {28},
  year         = {2020},
}