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.

基于几何相位原理，我们设计了一种近红外波段的全介电传输编码超表面。全介电单元由硅纳米柱和二氧化硅衬底组成。我们可以对设计单元结构进行编码以构建编码的超表面。我们将编码超表面序列的加法原理引入几何相位超表面。通过数值编码粒子之间的相加规则，将两个编码超表面相加可以得到一个新的编码序列，并且新的编码序列具有前两个编码序列的散射特性。换句话说，我们可以通过将两个编码的超表面的序列相加来得到函数相加的结果。我们通过设计不同编码序列的相加来验证几何相位编码超曲面相加原理的准确性。这种设计方法在多功能光子器件中具有潜在的应用。