物理
角动量
涡流
对称(几何)
反射对称性
凝聚态物理
光的轨道角动量
旋涡
总角动量
横截面
自旋(空气动力学)
光的角动量
角动量耦合
量子电动力学
电荷密度
量子力学
几何学
工程类
热力学
结构工程
数学
标识
DOI:10.1364/josaa.36.001374
摘要
Symmetry of electric spin angular momentum (SAM) density in the tight focusing of linearly polarized vortex beams is investigated in this paper. By calculating analytic expressions of SAM density, reflection symmetry and rotation symmetry of SAM density are found in the focal region. The vortex phase can break some symmetry, leading to non-zero longitudinal SAM. When the vortex phase vanishes, more symmetry will occur. It is proved that longitudinal SAM is zero when the topological charge is zero, and that transverse SAM is always zero. This paper is expected to advance our understanding of distribution of SAM density and optical spin-orbit coupling.
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