Photonic spin Hall effect (SHE) provides new opportunities for achieving spin-based photonics applications. However, flexibly manipulating the spin-dependent splitting (SDS) of photonic SHE and imposing extra phase modulation on the two spin components are always a challenge. Here, a controllable SHE mechanism based on phase function construction is reported. It is concluded that the phases with specific functional structures performing a coordinate translation are equivalent to integrating a gradient phase to the original phases. Hence, the original phase can be used for independent phase modulation, and the gradient phase originating from the coordinate translation is capable of manipulating the SDS. A metasurface with Pancharatnam–Berry phase that can impose conjugate phases to the two spin components of light is fabricated to verify this mechanism. By shifting the light position, the SDS is continuously manipulated in the visible region, which is successfully used for detecting the polarization ellipticity. The extra phase modulation is also performed with the original phase and thus enables measuring singular beams. It is anticipated that the controllable SHE manipulation method may open new avenues in the fields of spin photonics, optical sensing, optical communications, etc.

中文翻译：

---

具有相位函数构造的可控光子自旋霍尔效应

光子自旋霍尔效应 (SHE) 为实现基于自旋的光子学应用提供了新的机会。然而，灵活地操纵光子 SHE 的自旋相关分裂 (SDS) 并在两个自旋分量上施加额外的相位调制始终是一个挑战。在这里，报告了一种基于相函数构造的可控 SHE 机制。得出的结论是，具有特定功能结构的相位执行坐标平移等效于将梯度相位集成到原始相位中。因此，原始相位可用于独立相位调制，源自坐标平移的梯度相位能够操纵 SDS。制造具有 Pancharatnam-Berry 相的超表面，可以对光的两个自旋分量施加共轭相，以验证这种机制。通过改变光的位置，SDS 在可见光区被连续操纵，成功地用于检测偏振椭圆度。额外的相位调制也用原始相位进行，因此可以测量奇异光束。预计可控的 SHE 操纵方法可能会在自旋光子学、光学传感、光通信等领域开辟新的途径。额外的相位调制也用原始相位进行，因此可以测量奇异光束。预计可控的 SHE 操纵方法可能会在自旋光子学、光学传感、光通信等领域开辟新的途径。额外的相位调制也用原始相位进行，因此可以测量奇异光束。预计可控的 SHE 操纵方法可能会在自旋光子学、光学传感、光通信等领域开辟新的途径。