A broadband achromatic metalens for focusing and imaging in the visible

By W. T. Chen, A. Zhu, V. Sanjeev, Mohammadreza Khorasaninejad, Zhujun Shi, Eric Lee, F. Capasso. Nature Nanotechnology, 2018

1,628 citations recorded by the source corpus.

A key goal of metalens research is to achieve wavefront shaping of light using optical elements with thicknesses on the order of the wavelength. Such miniaturization is expected to lead to compact, nanoscale optical devices with applications in cameras, lighting, displays and wearable optics. However, retaining functionality while reducing device size has proven particularly challenging. For example, so far there has been no demonstration of broadband achromatic metalenses covering the entire visible spectrum. Here, we show that by judicious design of nanofins on a surface, it is possible to simultaneously control the phase, group delay and group delay dispersion of light, thereby achieving a transmissive achromatic metalens with large bandwidth. We demonstrate diffraction-limited achromatic focusing and achromatic imaging from 470 to 670 nm. Our metalens comprises only a single layer of nanostructures whose thickness is on the order of the wavelength, and does not involve spatial multiplexing or cascading. While this initial design (numerical aperture of 0.2) has an efficiency of about 20% at 500 nm, we discuss ways in which our approach may be further optimized to meet the demand of future applications.Controlling the geometry of each dielectric element of a nanostructured surface enables frequency-dependent group delay and group delay dispersion engineering, and the fabrication of an achromatic metalens for imaging in the visible in transmission.

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

View Paper: https://www.semanticscholar.org/paper/dba52f95c305a00fb81ea5a9c620654405302219

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Citations in the corpus

Imaging based on metalenses (2020, background): “(b) Images of SUSAFRC taken by the achromatic metalens [78].”
End-to-end optimization of optics and image processing for achromatic extended depth of field and super-resolution imaging (2018, background): “One possible solution are metalenses, which have recently enabled the fabrication of single ultrathin optical elements that encode wavelength-dependent phase patterns onto the incoming light, thereby achieving physical achromaticity without the need for post-processing [Chen et al. 2018; Yang et al.”
Tunable metasurfaces towards versatile metalenses and metaholograms: a review (2022, positive): “Achromatic metalenses have been fabricated using complex geometric-structured meta-atoms that have a wide phasedispersion set, and therefore enable achromatic focusing with single-layered metasurfaces.(53) Furthermore, complex-amplitude metaholograms have been proposed by varying the conversion effi”