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Metasurfaces offer versatile wavefront manipulation and near-diffraction-limited focusing; yet suffer from pronounced chromatic aberration due to wavelength-dependent phase responses, especially under high numerical aperture (NA) conditions. In this work, we propose an equal-area annular-sector Latin-square spatial-multiplexing strategy that structurally segments the metasurface lens to achieve wavelength-independent multiplexing, coupled with a three-stage hybrid optimization algorithm. The resulting silicon metasurface lens, designed for the 2.1–2.3 μm short-wave infrared band with an NA of 0.915, delivers an average focal-spot full width at half maximum (FWHM) of approximately 1.19 μm, nearly reaching the diffraction limit, while maintaining a focal-length variation of only 3.45% across the entire bandwidth, demonstrating effective high-NA multi-wavelength achromatic performance.
Miao et al. (Wed,) studied this question.