Aberration-corrected large-scale hybrid metalenses

Rajath Sawant,Patrice Genevet,Mikael Käll,Daniel Andrén,Ruggero Verre,Renato Juliano Martins,Samira Khadir

doi:10.1364/optica.434040

Rajath Sawant, Patrice Genevet + Show 5 more

Open Access

https://doi.org/10.1364/optica.434040

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Abstract

Hybrid components combining the optical power of a refractive and a diffractive optical system can form compact doublet lenses that correct various aberrations. Unfortunately, the diffraction efficiency of these devices decreases as a function of the deflection angle over the element aperture. Here, we address this issue, compensating for chromatic dispersion and correcting for monochromatic aberrations with centimeter-scale hybrid-metalenses. We demonstrate a correction of at least 80% for chromatic aberration and 70% for spherical aberration. We finally present monochromatic and achromatic images that clearly show how these hybrid systems outperform standard refractive lenses. The possibilities to adjust arbitrary spatial amplitude, phase, polarization, and dispersion profiles with hybrid metasurfaces offer unprecedented optical design opportunities for compact and broadband imaging, augmented reality/virtual reality, and holographic projection.

Highlights

Refractive lenses are extensively used in imaging systems such as cameras, microscopes, and telescopes
We present the characterization results, including point-spread function (PSF), aberration coefficients, and imaging, demonstrating up to 80% and 70% of chromatic and spherical aberration correction, respectively
In order to choose the diameter d of the pinhole to mimic a point source, one needs to satisfy the following condition: d γ φairy [34], with γ = fFL/ ftest, where fFL = 200 mm and ftest = 50 mm are the focal lengths of the focusing/collimating convex lens and the test lens (CAM, spherical aberration correction metasurface (SAM), or bare lens), respectively. φairy = 2,44 λ N#, where λ = 650 nm is the central wavelength of broadband light and N# is the f -number of the test lens

Summary

Introduction

Refractive lenses are extensively used in imaging systems such as cameras, microscopes, and telescopes. The properties of the metasurface devices are engineered to correct the aberrations of a classical positive spherical lens, in agreement with previous calculations on hybrid diffractive-refractive achromats [3]. The article is organized as follows: the first part introduces the design, fabrication, and characterization procedures of the metacorrectors, where we first derive the phase profiles needed to correct for chromatic and spherical aberrations.

Results

Conclusion