光学涡旋的对称性破缺：倏逝场中奇点的产生与湮灭
Symmetry breaking of optical vortices: Birth and annihilation of singularities in the evanescent field
摘要：
用简单的方法处理了光学涡旋（或相位奇点、螺旋位错）与普通物质的相互作用。利用全内反射现象和入射到折射率低于原始传播介质的四个平面波的叠加，我们能够显示在具有弯曲拓扑特征的倏逝场中光学涡旋的产生和湮灭。到目前为止，这种现象仅在自由空间传播中进行了探索。通过适当的调谐过程，涉及入射平面波的入射角和振幅，有可能在材料附近产生不寻常的光学涡旋拓扑特征。我们相信，这项工作可以打开近场光学弯曲光学涡旋操纵的新方面。
英文摘要：
The interaction of optical vortices (or phase singularities, screw dislocations) with ordinary matter is treated with simple approach. Using total internal reflection phenomenon and superposition of four plane waves incident on a material with refractive index lower than the original propagating medium, we are able to show birth and annihilation of optical vortices in the evanescent field with curved topological features. Until now, this phenomenon has been explored only in free space propagation. By a suitable tuning process, involving the incident angles and the amplitudes of the incident plane waves, it is possible to create unusual topological features of optical vortices in the vicinity of the material. We believe that this work can open new aspects of curved optical vortex manipulation in near-field optics.
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