Multi-function scattering beam regulation based on the superposition method of geometric phase coded metasurface sequences

Abstract Based on the geometrical phase principle, we design an all-dielectric transmission coded metasurface in the near-infrared band. The all-dielectric unit cell is composed of silicon nanopillars and silicon dioxide substrate. We can encode design unit structures to build coded metasurface. We introduce the addition principle of encoding metasurface sequence into geometric phase metasurface. A new encoding sequence can be obtained by adding the two encoding metasurfaces through the addition rules between the numerically encoded particles, and the new encoding sequence has the scattering properties of the previous two encoding sequences. In other words, we can get the result of adding the functions by adding the sequences of two coded metasurfaces. We verify the accuracy of the addition principle of geometric phase coding metasurface by designing the addition of different coding sequences. This design method has potential applications in multifunctional photonic devices.