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Verification of achromatic converging metalens. (a) Optical image of a fabricated metalens with NA = 0.268. (b) Measured light intensity of focal spot at incident wavelength λ = 1500 nm. (c) Zoomed-in scanning electron microscope (SEM) image of the fabricated metalens. (d) Experimental (top row) and numerical (bottom row) intensity profiles of BAML along axial planes at various incident wavelengths. (Reproduced from [35] with permission).
