Twin-Lever Multifunctional Meta-Optics With High Longitudinal Tolerance

Metasurfaces have transformed nanophotonics by enabling full vectorial control of light's amplitude, phase, and polarization within subwavelength-thick structures, allowing functionalities unattainable with traditional refractive optics. achieving broad achromaticity and multifunctional operation on one flat platform is still a major challenge for imaging applications using metasurfaces. Additionally, current designs face limitations due to small longitudinal tolerance and aperture size. These issues create strict optical alignment requirements that make practical, real-time use difficult. Here, we present a twin-lever design strategy that achieves polarization-programmable, achromatic broadband dual-mode imaging (bright-field focusing and vortex-mediated edge-enhanced imaging), with precise control over the axial position of maximum intensity through the aperture, all realized within an ultra-compact, single-layer metasurface architecture featuring high longitudinal tolerance. Comprehensive full-wave simulations and experimental characterizations confirm chromatic-aberration-free focusing, spin-selective phase fidelity, and high-longitudinal tolerance with aperture-weighted axial bias across the visible spectrum (488-633 nm). This CMOS-compatible easy to operate platform establishes a foundation for reconfigurable, multimodal, and broadband optical systems, heralding a new class of intelligent meta-optical components for next-generation microscopy, imaging, and integrated photonic technologies.