Metasurface phased arrays for conventional and quantum optics

Abstract Optical phased array (OPA) has emerged as a promising technology for a wide range of applications ranging from LIDAR for autonomous vehicles, space communication, laser machining to augmented reality. Metasurfaces have the potential to greatly improve the performance of OPAs and extend their range of applications. Although metasurface OPAs have found applications mostly in conventional optics so far, they have also shown great promise for application in light emitting devices and quantum optics in recent years. This paper presents a review of the state of the art of metasurface OPAs for both conventional and emerging applications. Major progress made in recent years and the important challenges that need to be addressed are discussed.