Polarization-Insensitive Metalenses at Visible Wavelengths

Khorasaninejad, Mohammadreza; Zhu, Alexander Y.; Roques‐Carmes, Charles; Chen, Wei Ting; Oh, Jaewon; Mishra, Ishan; Devlin, Robert C.; Capasso, Federico

doi:10.1021/acs.nanolett.6b03626

articleNano LettersOct 24, 2016GREEN OA

Polarization-Insensitive Metalenses at Visible Wavelengths

MKMohammadreza Khorasaninejad AYAlexander Y. Zhu CRCharles Roques‐Carmes WTWei Ting Chen JOJaewon Oh

Harvard University · École Polytechnique · +1 more institution

PubMed

Indexed incrossrefpubmed

Abstract

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.

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757

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Topics & keywords

Topics

Keywords

Optics
Materials science
Wavelength
Polarization (electrochemistry)
Optoelectronics
Lithography
Planar
Fabrication

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