ABSTRACT
This chapter focuses on ultrathin metalens and three-dimensional optical holography based on plasmonic metasurfaces. Metasurfaces, the emerging field of metamaterials, which consist of a single layer of artificial "atoms," have captured the attention of the scientific community since they do not require complicated three-dimensional nanofabrication techniques but can steer light in equally dramatic ways. To facilitate the design of the metasurfaces, a simple analytical model based on dipolar emitters can be used. The emission of the antennas can be well approximately by that of electric dipoles. The chapter demonstrates 3D computer-generated holography image reconstruction by using an ultrathin plasmonic metasurface consisting of an array of subwavelength plasmonic antennas with carefully defined orientations. The metasurface design in experiment exhibits a dispersionless phase profile which results from the geometric Berry phase. The dispersionless nature of metasurface can result in broadband operation without sacrificing image quality.
