Controlling asymmetric transmission phase in planar chiral metasurfaces

Abstract Metasurfaces with ultrathin artificial structures have attracted much attention because of their unprecedented capability in light manipulations. The recent development metasurfaces controllable responses opens up new opportunities various applications. Moreover, composed twisted chiral can generate asymmetric for opposite incidence, leading to more degrees freedom wave detections and controls. However, most past studies had focused on the amplitude responses, not mention using bi-directional phase characterization manipulation metasurfaces. Here, we report a birefringent interference approach achieve transmission from planar metasurface by tuning orientation respect optical axis an add-on substrate. To demonstrate our approach, fabricate Au sawtooth nanoarray measure placed sapphire crystal slab. metasurface-sapphire system exhibits large oscillatory behavior parameter. We confirm experimental results Jones matrix calculations data obtained full-wave simulations metasurface. Our is simple nondestructive, enabling functionalities potential applications communication, imaging, remote sensing.