Design and Analysis of Extended Depth of Focus Metalenses for Achromatic Computational Imaging

Abstract

Metasurface optics have demonstrated vast potential for implementing traditional optical components in an ultra-compact and lightweight form factor. Metasurface lenses, also called metalenses, however, suffer from severe chromatic aberrations, posing serious limitations on their practical use. Existing approaches for circumventing such aberrations via dispersion engineering are limited to small apertures and often entails multiple scatterers per unit cell with small feature sizes. Here, we present an alternative technique to mitigate chromatic aberration and demonstrate high-quality, full-color imaging using extended depth of focus (EDOF) metalenses and computational reconstruction. Previous EDOF metalenses relied on cubic phase masks that induced asymmetric artifacts in images, whereas here we demonstrate the use of symmetric phase masks that can improve subsequent image quality, including logarithmic-aspherical, and shifted axicon masks. Our work will inspire further development in achromatic metalenses beyond dispersion engineering and open new research avenues on hybrid optical-digital metasurface systems.

References in corpus (6)

• scikit-image: Image processing in Python
• Subwavelength-thick Lenses with High Numerical Apertures and Large Efficiency Based on High Contrast Transmitarrays
• A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures
• Varifocal zoom imaging with large area focal length adjustable metalenses
• Inverse designed metalenses with extended depth of focus
• Simultaneous achromatic and varifocal imaging with quartic metasurfaces in the visible

Cited by in corpus (5)

• Inverse Designed Extended Depth of Focus Meta-Optics for Broadband Imaging in the Visible
• Neural-Optic Co-Designed Polarization-Multiplexed Metalens for Compact Computational Spectral Imaging
• Large Field-of-View Thermal Imaging via All-Silicon Meta-Optics
• EigenCWD: a spatially-varying deconvolution algorithm for single metalens imaging
• Implementation of ultra-broadband optical null media via space-folding