Polarization-Insensitive Metalenses at Visible Wavelengths.

By Mohammadreza Khorasaninejad, A. Zhu, C. Roques-Carmes, W. Chen, Jaewon Oh, Ishan Mishra, R. Devlin, F. Capasso. Nano letters (Print), 2016

674 citations recorded by the source corpus.

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 symmetric with high Strehl ratios. The single step lithography and compatibility with large-scale fabrication processes make metalenses highly promising for widespread applications in imaging and spectroscopy.

Subfields: Aerospace Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/779633d88c4f420016bf9c0488758dbcca9e446a

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Citations in the corpus

Recent advances in planar optics: from plasmonic to dielectric metasurfaces (2017, background): “These metalenses are made of TiO2 cylindrical nanopillars of the same height but of varying diameter depending on their radial position, which controls the local phase shift [108].”
Optical Metasurfaces: Progress and Applications (2018, neutral): “A polarization-insensitive design of a metalens (46) was recently presented using transition-metal oxide nanopillar antennas.”
Imaging with flat optics: metalenses or diffractive lenses? (2019, background): “85 90 um / 300 um 83% 250 nm / 600 nm Polarization Insensitive [28]”
Electromagnetic metasurfaces: physics and applications (2019, positive): “In 2016, Capasso’s group demonstrated high-efficiency transmissive metalenses for visible light [231], with meta-atoms being nanopillars made by high-index TiO2 on a glass substrate [Fig.”
Metalenses: Versatile multifunctional photonic components (2017, background): “One prevailing problem is the angled sidewall, which introduces an error in the resultant phase (63).”