Longitudinal multifocal metalenses are pivotal for miniaturized multimagnification and 3D imaging, yet integrating tailored multifocal distributions, achromaticity, and polarization multiplexing in a single-layer design remains challenging. Here, we report a nanoprinted geometric-phase metalens that generates a longitudinally separated triple-wavelength multifoci, each wavelength producing three independent foci. The spatial overlap creates hybrid foci featuring a discrete-wavelength achromatic primary focus alongside companion foci, with fully tailorable polarization and intensity. Utilizing the optimized two-photon polymerization lithography, we achieve a 650 nm lattice period and an aspect ratio of ∼16, overcoming prior limits in phase sampling and diffraction loss. The fabricated metalens exhibits axial chromatic aberration below 1 μm and near-diffraction-limited focusing. Two prototypes are demonstrated for coherent red-yellow-green characterization and incoherent red-green-blue imaging, both enabling high-quality achromatic multimagnification. This strategy provides a compact, low-cost route toward integrated metalens optical systems.
Tang et al. (Wed,) studied this question.