源于光学突变叠加的内禀轨道角动量
Intrinsic Orbital Angular Momentum Originated from Optical Catastrophe Superposition
AI总结：
本文提出旋风突变光束（CCBs）在无相位涡旋依赖下具有内禀轨道角动量（OAM），通过理论计算与实验验证其OAM可通过叠加光束数量调控，揭示了OAM与相位涡旋的独立性，为OAM波应用提供新方向。
摘要：
传统上，内禀轨道角动量（OAM）与相位涡旋相关联。然而，我们对2D叠加突变光束（称为旋风突变光束，CCBs）的传播动力学的研究表明，这些光束固有地表现出旋转并具有OAM，这与通常与相位涡旋的联系截然不同。我们的观察清楚地显示这些光束在自聚焦传播和粒子操控过程中旋转，证实了OAM的存在。理论计算确认这些光束的OAM是内禀的，并且可以通过改变叠加光束的数量来调整。此外，我们的干涉和相位研究表明，尽管CCBs表现出相位涡旋，但它们并不围绕相位涡旋的奇点旋转，且其总拓扑荷为零。这意味着CCBs内OAM的表现不依赖于CCBs内所呈现的相位涡旋的非零拓扑荷。特别是，本征态分解分析表明，CCBs可以分解为具有不均匀保真度的Laguerre-Gaussian（LG）模式的复合，其中LG模式的拓扑荷与叠加突变光束的倍数对齐，但不等于CCBs内每个光子的OAM值，强调了CCBs内的内禀OAM及其与相位涡旋缺乏联系。我们的发现不仅推进了对OAM与相位涡旋之间关系的理解，还为OAM波的不同应用铺平了道路，促进了其在光学和其他领域的发展。
英文摘要：
Conventionally, intrinsic orbital angular momentum (OAM) is associated with phase vortices. However, our investigation into the propagation dynamics of 2D superimposed catastrophe beams, termed cyclone catastrophe beams (CCBs), reveals that these beams inherently exhibit rotation and possess OAM, distinct from the typical connection to phase vortices. Our observations clearly show these beams rotating during autofocusing propagation and particle manipulation, confirming the presence of OAM. Theoretical calculations affirm that the OAM of these beams is intrinsic and can be adjusted by varying the number of superimposed beams. Furthermore, our interference and phase studies indicate that, although CCBs exhibit phase vortices, they do not rotate around the singularities of phase vortices and their total topological charges are zero. This implies that the manifestation of OAM within CCBs does not rely on nonzero topological charge of the presented phase vortices within CCBs. Especially, eigenstates decomposition analysis illustrates that CCBs can be decomposed as a composite of Laguerre-Gaussian (LG) modes with uneven fidelity, where the topological charges of LG modes align with multiples of the superimposed catastrophe beams but do not equal to the value of the OAM per photon within CCBs, emphasizing the intrinsic OAM within CCBs and the absence of a connection to phase vortices. Our findings not only advance the understanding of the relationship between OAM and phase vortices but also pave the way for different applications of OAM waves, catalyzing their development in optics and other domains.
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