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(a–c) The simulated intensity profiles of the transmitted beam by the metalenses in the xz-plane (a) and z axis (b) as well as the vertical cut of the focusing spot size at y = 0 (c) for several metalenses with f ranging from 2 to 14 μm; (d) Schematic of the calculation of the focusing efficiency. The inset picture is the focal plane of the metalens designed for f = 6 μm; (e) Simulated values of the transmission, focusing efficiency, NA and FWHM spot size for different focal lengths.
