论文标题
同时在光子晶格中的动量空间中同时创建多个涡流 - 抗差对
Simultaneous creation of multiple vortex-antivortex pairs in momentum space in photonic lattices
论文作者
论文摘要
由于与光子晶格相互作用而引起的光轨道角动量（OAM）的工程揭示了丰富的物理，并激发了潜在的应用。我们通过探测单个聚焦高斯光束的蜂窝和六边形光子晶格，报告了在动量空间中定期分布的量化涡流阵列的实验创建。对于蜂窝晶格，涡旋与狄拉克点相关，并模仿浆果曲率来源。但是，我们表明，涡旋的空间模式是由光包在光学晶格中演变而非晶格拓扑特性的波数据包的对称性强烈定义的。我们的发现通过连接对称性和OAM转换来揭示潜在的物理，并提供了一种简单有效的方法来通过非结构化的光创建定期分布的多个涡流。
Engineering of the orbital angular momentum (OAM) of light due to interaction with photonic lattices reveals rich physics and motivates potential applications. We report the experimental creation of regularly-distributed quantized vortex arrays in momentum space by probing the honeycomb and hexagonal photonic lattices with a single focused Gaussian beam. For the honeycomb lattice, the vortices are associated with Dirac points and mimic the Berry curvature sources. However, we show that the resulting spatial patterns of vortices are strongly defined by the symmetry of the wave packet evolving in the optical lattice but not by lattice topological properties. Our findings reveal the underlying physics by connecting the symmetry and OAM conversion, and provide a simple and efficient method to create regularly-distributed multiple vortices by unstructured light.
