Optical metasurfaces towards multifunctionality and tunability

Abstract Optical metasurfaces is a rapidly developing research field driven by its exceptional applications for creating easy-to-integrate ultrathin planar optical devices. The tight confinement of the local electromagnetic fields in resonant photonic nanostructures can boost many effects and offer novel opportunities nanoscale control light–matter interactions. However, once structure-only are fabricated, their functions will be fixed, which limits it to make breakthroughs practical applications. Recently, persistent efforts have led functional multiplexing. Besides, dynamic light manipulation based on has been demonstrated, providing footing ground arbitrary full space-time dimensions. Here, we review latest progress multifunctional tunable metasurfaces. Firstly, introduce evolution then present concepts, basic principles, design methods metasurface. Then with more details, discuss how realize both multifunctionality tunability. Finally, also foresee various future directions including innovative methods, new material platforms, metadevices.