Pancharatnam–Berry (PB) phase has become an effective tool to realize the photonic spin Hall effect (PSHE) in recent years, due to its capacity of enhancing the spin-orbit interaction. Various forms of PSHEs have been proposed by tailoring the PB phase of light, however, the propagation trajectory control of the separated spin states has not been reported. In this paper, we realize the oscillated spin-dependent separation by using the well-designed PB phase optical elements based on the transverse-to-longitudinal mapping of Bessel beams. Two typical oscillated PSHEs, i.e., the spin states are circulated and reversed periodically, are experimentally demonstrated with two PB phase elements fabricated with liquid crystal. The displacements and periods of these oscillations can be controlled by changing the transverse vector of the input Bessel beam. The proposed method offers a new degree of freedom to manipulate the spin-dependent separation, and provides technical supports for the application in spin photonics.

Pancharatnam-Berry（PB）相由于具有增强自旋-轨道相互作用的能力，近年来已成为实现光子自旋霍尔效应（PSHE）的有效工具。通过调整光的 PB 相位已经提出了各种形式的 PSHE，但是，尚未报道分离自旋态的传播轨迹控制。在本文中，我们通过使用基于贝塞尔光束的横向到纵向映射的精心设计的 PB 相位光学元件来实现振荡自旋相关分离。两种典型的振荡PSHE，即自旋态周期性地循环和反转，用两个用液晶制造的PB相元件进行了实验证明。这些振荡的位移和周期可以通过改变输入贝塞尔光束的横向矢量来控制。