Fig. 1


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Schematic of an achromatic metalens with a wide field-of-view. The metalens should be able to transform the planar wavefront incident at any given angle into a spherical wavefront that converges at a point on the focal plane. The location of the focal spot, indicated as r0, necessarily depends on the angle of incidence of the plane wave, but, for achromatic operation, it should not depend on frequency.

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