Table 2.

Comparison of metasurface-based lens in broadband achromatic optics design.

Reference (Year)	Material	NA	Wavelength
Khorasaninejad et al. (2017) [32]	TiO2	0.2	490–550 nm
Wang et al. (2017) [35]	Au	0.324	1200–1680 nm
Li et al. (2017) [38]	Si	0.629	473, 532, and 632.8 nm