Fig. 5: Flat-optics dichroic mirror. | Light: Science & Applications

Fig. 5: Flat-optics dichroic mirror.

From: Broadband vectorial ultrathin optics with experimental efficiency up to 99% in the visible region via universal approximators

Fig. 5

a Cost function of the target design for increasing iterations of ALFRED (blue: particles, red: mean value), and b sample design found. The dichroic component is designed based on 4 target points (c, blue/red markers), each characterized by a flat derivative and a flat wavefront. c Comparison of FDTD theoretical (dashed line) and experimental (solid line) results. d SEM image of a fabricated sample. e Conventional dichroic geometry, requiring 45° impinging light, versus the flat-optics structure working at normal incidence

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