Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges
Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges
复制标题
DOI：
10.1186/s43593-022-00018-y
复制
发表时间：
2022-07-18
期刊：
影响因子：
--
通讯作者：
Alu, Andrea
中科院分区：
文献类型：
--
作者：
Wang, Mingsong;Hu, Guangwei;Alu, Andrea
光学涡旋的拓扑特征已经为自由空间和片上光子技术打开了机会，例如，用于多路复用光通信和鲁棒的信息传输。在一个平行但不相交的努力中，支持双曲声子极化激元（HP 2）的极性各向异性货车德瓦耳斯纳米材料已被利用来大幅提高光-物质相互作用。迄今为止，对HP 2的研究主要集中在振幅和尺度特征的控制上。在这里，我们报告的产生和观察中红外双曲极化激元涡（HP 2 Vs）与可重构拓扑电荷。螺旋形的金盘涂有一片六方氮化硼被用来定制自旋轨道相互作用，并实现深亚波长HP 2 Vs。激发自旋，螺旋几何形状和HP 2色散之间的复杂的相互作用，使相关的拓扑电荷的鲁棒的可重构性。我们的研究结果揭示了将HP 2应用扩展到拓扑光子学、通过将这些现象与单光子发射器集成的量子信息处理、强大的片上光学应用、传感和纳米粒子操纵的独特机会。
The topological features of optical vortices have been opening opportunities for free-space and on-chip photonic technologies, e.g., for multiplexed optical communications and robust information transport. In a parallel but disjoint effort, polar anisotropic van der Waals nanomaterials supporting hyperbolic phonon polaritons (HP2s) have been leveraged to drastically boost light-matter interactions. So far HP2 studies have been mainly focusing on the control of their amplitude and scale features. Here we report the generation and observation of mid-infrared hyperbolic polariton vortices (HP2Vs) associated with reconfigurable topological charges. Spiral-shaped gold disks coated with a flake of hexagonal boron nitride are exploited to tailor spin-orbit interactions and realise deeply subwavelength HP2Vs. The complex interplay between excitation spin, spiral geometry and HP2 dispersion enables robust reconfigurability of the associated topological charges. Our results reveal unique opportunities to extend the application of HP2s into topological photonics, quantum information processing by integrating these phenomena with single-photon emitters, robust on-chip optical applications, sensing and nanoparticle manipulation.