Transmissive angle-multiplexed meta-polarizer based on a multilayer metasurface

Metasurfaces have exhibited great capabilities to control electromagnetic waves, and many multifunctional metasurfaces were recently proposed. However, although angle-multiplexed meta-devices were successfully realized in reflection geometries, their transmission-mode counterparts are difficult to achieve due to the additional requirements. Here, we design and fabricate a transmissive angle-multiplexed meta-polarizer in the microwave regime based on a multilayer metasurface. Coupled-mode-theory analyses reveal that the device exhibits distinct angle-dependent transmissive responses under exci-tations with different polarizations, and such differences are further enhanced by multiple scatterings inside the device. Microwave experimental results are in good agreement with numerical simulations and theoretical analyses. dispersions of Fabry – Perot (FP) resonance modes of different polarizations supported by the system. Excellent agreement among microwave experiments, numerical simulations, and theoretical analyses validates our design strategy. Our findings open up a new way to design transmissive angle-multiplexed meta-devices, which may yield many applications in practice.