Polarization-Insensitive Metalenses at Visible Wavelengths.

@article{Khorasaninejad2016PolarizationInsensitiveMA,
  title={Polarization-Insensitive Metalenses at Visible Wavelengths.},
  author={Mohammadreza Khorasaninejad and A Y Zhu and C Roques-Carmes and W T Chen and J Oh and I Mishra and Robert C Devlin and F Capasso},
  journal={Nano letters},
  year={2016},
  volume={16 11},
  pages={
          7229-7234
        }
}
In this Letter, we demonstrate highly efficient, polarization-insensitive planar lenses (metalenses) at red, green, and blue wavelengths (λ = 660, 532, and 405 nm). Metalenses with numerical apertures (NA) of 0.85 and 0.6 and corresponding efficiencies as high as 60% and 90% are achieved. These metalenses are less than 600 nm-thick and can focus incident light down to diffraction-limited spots as small as ∼0.64λ and provide high-resolution imaging. In addition, the focal spots are very… CONTINUE READING
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