Geometric and propagation phase metalenses achieved focusing efficiencies of 17.6% and 32.1%, highlighting advanced pitch size control.
Geometric and propagation phase metalenses, using high-refractive-index silicon-rich nitride, were designed to achieve high numerical apertures (NA) and focusing efficiencies of 17.6% (NA 0.99) and 32.1% (NA 0.97) through pitch size control.
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Khalilian et al. (2025) studied this question.
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