Wide field-of-view metalens: a tutorial

Wide field-of-view (FOV) optics are essential components in many optical systems, with applications spanning imaging, display, sensing, and beam steering. Conventional refractive wide FOV often involve multiple stacked lenses, resulting large size weight as well high cost. Metasurface lenses or metalenses promise a viable solution to realizing without complex lens assembly. We review the various architectures of metalenses, elucidate their fundamental operating principles design trade-offs, quantitatively evaluate contrast imaging performances. Emerging enabled by metasurface also discussed.