Figure 1
From: Geometric metasurface enabling polarization independent beam splitting
Operation schematic of the holographic metasurface beam splitter compared to the conventional one based on linear phase gradient. (a) The GEM with linear phase gradient does not maintain consistent functionality on different incident polarizations because each antenna produces opposite phase delays against RCP and LCP. (b) The proposed holographic beam splitter functions identically under any kind of polarization. The responses of the device to RCP and LCP are exactly the same. Since all polarization states can be decomposed into a sum of RCP and LCP, the device functionality is not affected by polarization. (c) Encoded image in the hologram contains two white spots on a black background. The image is origin-symmetric, so it can overlap perfectly with its conjugate image. This symmetry enables polarization independent operation of our device. The number of generated beams is not limited to two, and varies depending on what the image is encoded.
