article published yes M. Khorasaninejad author A. Y. Zhu author Charles Roques-Carmes author e2e68fc9-6505-11ef-a541-eb4e72cc3e82 W. T. Chen author J. Oh author I. Mishra author R. C. Devlin author F. Capasso author 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. American Chemical Society2016 eng Metasurfacepolarization-insensitive metalensesvisible wavelengthtitanium dioxide 1530-6984 1530-6992 2779138010.1021/acs.nanolett.6b03626 16117229-7234 yes Khorasaninejad, M., A. Y. Zhu, Charles Roques-Carmes, W. T. Chen, J. Oh, I. Mishra, R. C. Devlin, and F. Capasso. “Polarization-Insensitive Metalenses at Visible Wavelengths.” <i>Nano Letters</i>. American Chemical Society, 2016. <a href="https://doi.org/10.1021/acs.nanolett.6b03626">https://doi.org/10.1021/acs.nanolett.6b03626</a>. Khorasaninejad, M., Zhu, A. Y., Roques-Carmes, C., Chen, W. T., Oh, J., Mishra, I., … Capasso, F. (2016). Polarization-insensitive metalenses at visible wavelengths. <i>Nano Letters</i>. American Chemical Society. <a href="https://doi.org/10.1021/acs.nanolett.6b03626">https://doi.org/10.1021/acs.nanolett.6b03626</a> M. Khorasaninejad, A.Y. Zhu, C. Roques-Carmes, W.T. Chen, J. Oh, I. Mishra, R.C. Devlin, F. Capasso, Nano Letters 16 (2016) 7229–7234. Khorasaninejad M, Zhu AY, Roques-Carmes C, et al. Polarization-insensitive metalenses at visible wavelengths. <i>Nano Letters</i>. 2016;16(11):7229-7234. doi:<a href="https://doi.org/10.1021/acs.nanolett.6b03626">10.1021/acs.nanolett.6b03626</a> Khorasaninejad M, Zhu AY, Roques-Carmes C, Chen WT, Oh J, Mishra I, Devlin RC, Capasso F. 2016. Polarization-insensitive metalenses at visible wavelengths. Nano Letters. 16(11), 7229–7234. Khorasaninejad, M., et al. “Polarization-Insensitive Metalenses at Visible Wavelengths.” <i>Nano Letters</i>, vol. 16, no. 11, American Chemical Society, 2016, pp. 7229–34, doi:<a href="https://doi.org/10.1021/acs.nanolett.6b03626">10.1021/acs.nanolett.6b03626</a>. M. Khorasaninejad <i>et al.</i>, “Polarization-insensitive metalenses at visible wavelengths,” <i>Nano Letters</i>, vol. 16, no. 11. American Chemical Society, pp. 7229–7234, 2016. 215222026-03-30T12:22:47Z2026-04-15T11:53:17Z