Continuity equation for spin angular momentum in relation to optical chirality
Continuity equation for spin angular momentum in relation to optical chirality
复制标题
DOI：
10.1103/physreva.102.023531
复制
发表时间：
2020-08
影响因子：
2.9
通讯作者：
A. Wu;Yoshito Y. Tanaka;Ryoma Fukuhara;T. Shimura
中科院分区：
文献类型：
--
作者：
A. Wu;Yoshito Y. Tanaka;Ryoma Fukuhara;T. Shimura
自旋角动量和轨道角动量分别是光的可观测性质。它们都可以与物质相互作用，引起彼此之间的交换，并在物质上产生光扭矩。然而，到目前为止，我们还不能单独讨论自旋角动量和轨道角动量的转移，也不能单独讨论它们的光力矩的来源。本文考虑了光手性密度，并提出了一种利用光手性密度分别分析自旋和轨道角动量转移的方法。我们的方法是基于自旋角动量密度的连续性方程。该方程由源加空间中手性通量密度与自旋角动量密度之间的扩展比例关系推导而来。我们的发现将极大地促进光与物质之间角动量相互作用的研究。
Spin and orbital angular momenta are separately observable properties of light. Both of them can interact with matter, causing an exchange between each other and generating an optical torque on the matter. However, thus far, we have been unable to separately discuss the transfer of the spin and orbital angular momenta or the origin of the optical torques with regard to them. Here, we consider the optical chirality density and propose an approach to analyzing the transfer of spin and orbital angular momenta separately by considering this property. Our approach is based on a continuity equation for spin angular momentum density. This equation is derived from an extended proportional relation between the chirality flux density and spin angular momentum density in sources-added space. Our findings will greatly facilitate the study of angular momentum interaction between light and matter.