Monolayer Optical Metasurface Design from Single-Function to Multi-Functions

Over the past decade, metasurfaces have offered significant promise for miniaturized and flat photonics by enabling precise manipulation of light’s phase, amplitude, and polarization through geometric design. The pursuit of multifunctional wavefront modulation at the micro-nano scale using these surfaces has emerged as a prominent research area. In this paper, we first explore the phase modulation principles underlying meta-atoms, then investigate how multiple degrees of freedom can be harnessed to achieve multifunctional optical behavior, thereby aligning with current research trends, and offer a consolidated overview of multifunctional meta-devices.