Abstract The interactions of photonic spin angular momentum and orbital angular momentum, i.e., the spin-orbit coupling in focused beams, evanescent waves or artificial photonic structures, have attracted intensive investigations for the unusual fundamental phenomena in physics and potential applications in optical and quantum systems. It is of fundamental importance to enhance performance of spin-orbit coupling in optics. Here, we demonstrate a titanium dioxide (TiO2)–based all-dielectric metasurface exhibiting a high efficient control of photonic spin Hall effect (PSHE) in a transmissive configuration. This metasurface can achieve high-efficiency symmetric spin-dependent trajectory propagation due to the spin-dependent Pancharatnam-Berry phase. The as-formed metadevices with high-aspect-ratio TiO2 nanofins are able to realize (86%, measured at 514 nm) and broadband PSHEs in visible regime. Our results provide useful insights on high-efficiency metasurfaces with versatile functionalities in visible regime.

中文翻译：

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二氧化钛超表面在可见光区操纵高效和宽带光子自旋霍尔效应

摘要 光子自旋角动量和轨道角动量的相互作用，即聚焦光束、倏逝波或人造光子结构中的自旋轨道耦合，已经引起了对物理学中不寻常的基本现象以及光学和量子系统中潜在应用的深入研究。 . 提高光学中自旋轨道耦合的性能至关重要。在这里，我们展示了一种基于二氧化钛 (TiO2) 的全介电超表面，在透射配置中表现出对光子自旋霍尔效应 (PSHE) 的高效控制。由于自旋相关的 Pancharatnam-Berry 相，该超表面可以实现高效的对称自旋相关轨迹传播。具有高纵横比 TiO2 纳米鳍的元器件能够实现（86%，在 514 nm 处测量）和可见光范围内的宽带 PSHE。我们的结果为在可见区域具有多功能功能的高效超表面提供了有用的见解。