Multifunctional light field modulations of composite- phase-based diatomic metasurfaces

Abstract

The all-dielectric phase metasurface due to their low-loss characteristics can be used for efficient wavefront control in the optical visible range. In this paper, we construct and design an improved diatomic structure metasurface by using the joint regulation of geometric phase and propagation phase. Compared with single atomic structures, we introduce new degrees of freedom to flexibly and effectively control the phase and amplitude of the optical wavefront. We can joint geometric phase or propagation phase to arrange two kinds of supramolecular structures to sophisticatedly realize multifunctional modulations of on/off imaging distributions in the near field and different image displays in the far field. We believe that our research results can provide reference for multifunctional optical surfaces, dynamic optical control and optical information encryption.