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Numerical results of the intensity distribution for metalens with f = 10 μm. (a) Si/ma-N disk metalens. (b) Si disk metalens. The upper panels are xz-plane views along the optical axis and the lower panels are xy-plane views at various z-positions. The left inset in (a) shows the designed phase map and corresponding metalens structure. The inset in (b) is the focusing efficiency graph as a function of focusing area. The white bar denotes 3 μm (approximately 2λ).
