Exploiting the energy flow of light fields is an essential key to tailor complex optical multistate spin and orbital angular momentum (OAM) dynamics. With this work, the energy flow is identified and quantified by a novel approach that is based on the symmetry breaking induced by nonlinear light–matter interaction of OAM carrying beams at the example of Mathieu beams, showing transverse invariant intensity distributions. These complex scalar nondiffracting beams exhibit outstanding transverse energy flows on elliptic paths. Although their energy is continuously redistributed during linear propagation in homogeneous media, the beams stay nondiffracting. This approach to visualize the energy flow of light is based on the nonlinear self‐action in a nonlinear crystal. By this, the sensitive equilibrium is perturbed and accumulation of rotating high‐intensity spots is enabled. Intensity distributions on elliptic, chiral paths are demonstrated as a manifestation of the energy flow. Furthermore, the formation of corresponding refractive index modulations that may be implemented as chiral waveguides, is controlled via the beam power and structure size.

中文翻译：

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可视化量身定制的能量流

利用光场的能量流是定制复杂的光学多态自旋和轨道角动量（OAM）动力学的关键。通过这项工作，通过一种新方法来识别和量化能量流，该方法基于在Mathieu光束示例中OAM承载光束的非线性光-物质相互作用引起的对称破坏，并显示出横向不变强度分布。这些复杂的标量非衍射光束在椭圆形路径上表现出出色的横向能量流。尽管它们的能量在线性传播过程中在均匀介质中不断地重新分配，但光束仍保持非衍射状态。这种可视化光能流的方法是基于非线性晶体中的非线性自作用。这样，敏感的平衡被扰动，并且旋转的高强度点的积累得以实现。椭圆形，手性路径上的强度分布被证明是能量流的体现。此外，可以通过束功率和结构尺寸来控制可以实现为手性波导的相应折射率调制的形成。