Taking advantage of the flexible customization of dynamic and Pancharatnam–Berry phases on meta-atoms, spin-decoupled multifunctional metasurfaces have been realized for optical beams of orthogonal circularly polarized lights, which promotes the diverse development of nanophotonic devices. To date, spin-decoupled metasurfaces can only spatially split and deflect beams in coplanar directions not in non-coplanar, limiting further applications. Here, a single metasurface is proposed to experimentally as well as numerically demonstrate the spin-decoupled omnidirectional anomalous refraction. The results indicate that the three-dimensionally omnidirectional dual-beam refractions are attributed to arbitrary engineering of spin-independent phase gradients along any in-plane orientations of the single metasurface. It is believed that the proposed spin-decoupled omnidirectional metasurfaces are promising candidates for multifunctional applications in compact spin-based nanophotonic systems, such as polarized beam splitting, steering, and polarimeter.

中文翻译：

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基于单个超表面的自旋解耦全向反常折射

利用元原子动态和Pancharatnam-Berry相的灵活定制，实现了正交圆偏振光束的自旋解耦多功能超表面，促进了纳米光子器件的多样化发展。迄今为止，自旋解耦超表面只能在共面方向上空间分裂和偏转光束，而不能在非共面方向上，限制了进一步的应用。在这里，提出了一个单一的超表面来通过实验和数值证明自旋解耦的全向反常折射。结果表明，三维全向双光束折射归因于沿单个超表面的任何面内方向的自旋无关相位梯度的任意工程。