C2 symmetric single-layered meta-atoms for asymmetric holography

Metasurfaces have gained considerable attention due to their control over light properties like phase, amplitude, and polarization, which benefitted the industry for their applications in digital displays and multimedia related applications. Miniaturization of the devices has always been an interesting domain for researchers that can be accomplished by enabling a device to perform multifunctional behavior. Here, we propose a meta-atom by breaking symmetry of spin orbit interactions resulting in polarization sensitive device that transmits and reflects simultaneously under different circular polarizations. A z-shaped silicon-based meta-atom is designed, which provides asymmetric transmission of 80 % and 74 % in reflection and transmission, respectively. We demonstrated polarization multiplexed holograms in transmission and reflection for proof of concept that reflects its potential in spin-controlled imaging and sensing devices.