Intrinsic Vortex–Antivortex Interaction of Light
Intrinsic Vortex–Antivortex Interaction of Light
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DOI：
10.1002/lpor.202100648
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发表时间：
2022-08
影响因子：
11
通讯作者：
Haolin Lin;Shenhe Fu;H. Yin;Zhen Li;Zhen-qiang Chen
中科院分区：
文献类型：
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作者：
Haolin Lin;Shenhe Fu;H. Yin;Zhen Li;Zhen-qiang Chen
光的自旋-轨道相互作用和非本征轨道-轨道相互作用已经得到了深入的研究，它们导致了光的自旋霍尔效应、轨道霍尔效应和自旋-轨道霍尔效应等重要现象。然而，光学内禀轨道-轨道相互作用的概念，即涡旋-反涡旋相互作用，却很少有人知道。在这里，这样一个新的相互作用过程的理论和实验证明，这是由于在一个自由传播的光场的奇异核的互易螺旋之间的相互作用而出现的。提出了一个描述该过程的通用模型，该模型包括一个线性独立项和一个非线性耦合项。结果表明，强耦合导致两个相互作用的涡之间的直观的相互吸引，而弱耦合，相反，在一个违反直觉的排斥现象的结果。涡旋-反涡旋相互作用使得能够预测和观测轨道角动量霍尔效应，以及在没有非线性光-物质相互作用的情况下适当结构的涡旋阵列的稳定传播。这些结果扩展了不同形式的光学角动量之间相互作用过程的范围，并为利用所提出的耦合机制研究新的效应提供了机会。
The spin–orbit interaction and the extrinsic orbit–orbit interaction of light have been thoroughly studied, which have led to important phenomena including the spin Hall effect, orbital Hall effect, and spin–orbit Hall effect of light. Nevertheless, the concept of optical intrinsic orbit–orbit interaction, which is named as vortex–antivortex interaction, is scarcely known to the authors knowledge. Here, such a novel interaction process is theoretically and experimentally demonstrated, which emerges due to mutual interplays among reciprocal helicities of singular cores in a freely propagating light field. A general model describing the process is presented, which includes a linearly independent term and a nonlinearly coupling term. It is revealed that the strong coupling leads to intuitive mutual attraction between two reciprocal vortices, while the weak coupling, in contrast, results in a counterintuitive repulsive phenomenon. The vortex–antivortex interaction enables the predictions and observations of the orbital angular momentum Hall effect, as well as the stable propagation of an appropriately structured vortex arrays without nonlinear light–matter interactions. The results expand the scope of interaction processes among different forms of optical angular momenta, and open opportunities for studies of new effects using the presented coupling mechanism.