A Hybrid Achromatic Metalens

Abstract

Metamaterials and metasurfaces are widely used to manipulate electromagnetic waves over a broad range of wavelengths. Several recent efforts have focused on metalenses, ultra-thin optical elements that focus light using subwavelength structures. Compared to their refractive counterparts, metalenses offer reduced size and weight, improved manufacturability, and new functionality such as polarization control. However, metalenses that correct chromatic aberration also suffer from markedly reduced focusing efficiency. Here we introduce a Hybrid Achromatic Metalens (HAML), that overcomes this trade-off and offers improved focusing efficiency over a broad wavelength range from 1000 - 1800 nm. Fabricated HAMLs demonstrated diffraction limited performance for numerical apertures (NA) of 0.27, 0.11, and 0.06 with average focusing efficiencies $>60\%$ and maximum efficiencies ~ $80\%$. HAMLs can be designed by combining recursive ray-tracing and simulated phase libraries rather than computational intensive global search algorithms. Moreover, HAMLs can be fabricated in low-refractive index materials using multi-photon lithography for customization or using molding for mass production.

arXiv comment20 pages, 7 figures

References in corpus (8)

• Dielectric Metasurfaces for Complete Control of Phase and Polarization with Subwavelength Spatial Resolution and High Transmission
• A review of metasurfaces: physics and applications
• Miniature optical planar camera based on a wide-angle metasurface doublet corrected for monochromatic aberrations
• Achromatic Metalens in the Visible and Metalens with Reverse Chromatic Dispersion
• A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures
• Metalenses at visible wavelengths: past, present, perspectives
• Metasurface Optics for Full-color Computational Imaging
• Holographic Colour Prints: Enhanced Optical Security by Combined Phase and Amplitude Control

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