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. 2019 Jul 10;9(7):993. doi: 10.3390/nano9070993

Table 1.

Comparison of the four metalenses.

Metalens M1 M2 M3 M4
Constructed unitcell U1 U1 U1 and U2 U1 and U2
Function Single-wavelength duplex Single-wavelength duplex Dual- wavelength duplex Dual- wavelength duplex
Wavelength 1.31 μm 1.31 μm 1.31 μm and 1.55 μm 1.31 μm and 1.55 μm
Duplex direction Horizontal Vertical Horizontal Vertical
Tunability Tunable Tunable Tunable tunable