New strategy demonstrates high numerical aperture and broadband achromatism in flat lenses, suggesting significant advancements in optical design.
A new strategy has been presented to overcome the long-term dilemma of simultaneously achieving high numerical aperture, large aperture size, and broadband achromatism of flat lenses. A stepwise phase dispersion compensation (SPDC) layer is introduced as a substrate on which the meta-atoms are positioned.
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Shao et al. (2025) studied this question.
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