Phase and polarization singularities are important degrees of freedom for electromagnetic field manipulation. Detecting these singularities is essential for modern optics, but it is still a challenge, especially in integrated optical systems. In this paper, we propose an on-chip plasmonic spin-Hall nanograting structure that simultaneously detects both the polarization and phase singularities of the incident cylindrical vortex vector beam (CVVB). The nanograting is symmetry-breaking with different periods for the upper and lower parts, which enables the unidirectional excitation of the surface plasmon polariton depending on the topological charge of the incident optical vortex beam. Additionally, spin-Hall meta-slits are integrated onto the grating so that the structure has a chiral response for polarization detection. We demonstrate theoretically and experimentally that the designed structure fully discriminates both the topological charges and polarization states of the incident beam simultaneously. The proposed structure has great potential in compact integrated photonic circuits.

相位和极化奇异性是电磁场操纵的重要自由度。检测这些奇异点对于现代光学至关重要，但仍然是一个挑战，尤其是在集成光学系统中。在本文中，我们提出了一种芯片上的等离激元自旋霍尔纳米光栅结构，该结构可同时检测入射圆柱涡矢量束（CVVB）的偏振和相位奇异性。纳米光栅的上部和下部具有不同周期的对称性破坏，这使得能够根据入射光学涡旋光束的拓扑电荷对表面等离激元极化进行单向激发。此外，自旋霍尔元狭缝集成在光栅上，因此该结构具有用于偏振检测的手性响应。我们在理论上和实验上证明，设计的结构可以完全同时分辨入射光束的拓扑电荷和偏振态。所提出的结构在紧凑的集成光子电路中具有巨大的潜力。