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. 2015 May 6;5:9977. doi: 10.1038/srep09977

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Theoretical and experimental results of the focusing property by planar metalens. (a) Simulated intensity distribution at the focal plane which is located at the propagation distance of z = 150 μm. (b) Experimental recorded intensity distribution at the focal plane. (c) Line-scan profiles along the diagonal across the focal spot for the simulated result (orange line) and the measured result (green line). Simulated (d) and measured (e) intensity distributions along the propagation distance ranging from 140 μm to 160 μm. (f) FWHM of the focal spot in the propagation direction, the black solid line represents the theoretical results and the red stars depict the experimental results with 1 μm step. False-colour map indicates the normalized intensity.