Metasurfaces - Physics and Applications

Abstract

Metasurfaces, the two-dimensional analog of metamaterials, have attracted progressively increasing attention in recent years due to their planar configurations and thus ease of fabrication, while enabling an unprecedented control over optical fields. The phase, amplitude, polarization, helicity and even angular momentum of the reflected and transmitted optical fields can be controlled at will by tailoring optically thin planar arrays of resonant subwavelength elements arranged in a periodic or aperiodic manner. As a result, numerous applications and fascinating devices have been realized by designed metasurfaces, including beam deflectors, wave plates, flat lenses, vortex beam generation, holograms and surface-wave couplers.