Helicity and angular momentum: A symmetry-based framework for the study of light-matter interactions
Helicity and angular momentum: A symmetry-based framework for the study of light-matter interactions
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DOI：
10.1103/physreva.86.042103
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发表时间：
2012-06
影响因子：
2.9
通讯作者：
I. Fernandez‐Corbaton;X. Zambrana-Puyalto;G. Molina-Terriza
中科院分区：
文献类型：
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作者：
I. Fernandez‐Corbaton;X. Zambrana-Puyalto;G. Molina-Terriza
我们提出了一个研究光-物质相互作用和光的角动量的理论和实践框架。我们的建议是基于螺旋度、总角动量和对称性的使用。我们将该框架与目前的处理方法进行了比较，目前的处理方法是分别考虑自旋角动量和轨道角动量，并在物理解释中使用两者之间的转移。在我们的建议中，避免了自旋和轨道角动量可分离的基本问题，而是基于系统的对称性进行预测，并且这些概念的实际应用是直接的。最后，该框架被用来说明应用于聚焦和散射的自旋到轨道转移的概念掩盖了与不同基本对称性的破坏有关的两个完全不同的物理现象：聚焦的横向平移对称和散射的电磁对偶对称。
We propose a theoretical and practical framework for the study of light-matter interactions and the angular momentum of light. Our proposal is based on helicity, total angular momentum, and the use of symmetries. We compare the framework to the current treatment, which is based on separately considering spin angular momentum and orbital angular momentum and using the transfer between the two in physical explanations. In our proposal, the fundamental problem of spin and orbital angular momentum separability is avoided, predictions are made based on the symmetries of the systems, and the practical application of the concepts is straightforward. Finally, the framework is used to show that the concept of spin to orbit transfer applied to focusing and scattering is masking two completely different physical phenomena related to the breaking of different fundamental symmetries: transverse translational symmetry in focusing and electromagnetic duality symmetry in scattering.