Full-space-manipulated multifunctional coding metasurface based on Fabry-Perot-like cavity

Multifunctional coding metasurfaces (CMs) have attracted extensive attention due to their ability to realize the multifunctional integration in optical devices. However, the researches on multifunctional CM mainly focus on dual functionality in reflected or transmitted space. Here, based on Fabry-Perot-like cavity, we propose a novel multifunctional CM to simultaneously control different polarized light in full-space. It is revealed that the designed CM possesses asymmetric transmission characteristic, which can simultaneously achieve three different functionalities by changing the polarization state and the propagation direction of incident light. As a proof of concept a single CM is designed to simultaneously realize the functionalities of beam splitting, diffusion scattering for co-polarized reflection and beam focusing for cross-polarized transmission. The simulated results are consistent with the experimental results, which demonstrates the feasibility of the design. This finding provides an effective approach to design multifunctional devices with miniaturization and high integration, which can also be used to achieve desired functionalities in other frequency domains. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.