物理
角动量
旋涡
极化(电化学)
光学
角动量耦合
自旋轨道相互作用
光的轨道角动量
涡流
光的角动量
总角动量
轨道角动量复用
凝聚态物理
量子力学
热力学
物理化学
化学
作者
Panpan Yu,Qian Zhao,Xinyao Hu,Yinmei Li,Lei Gong
出处
期刊:Optics Letters
[The Optical Society]
日期:2018-11-15
卷期号:43 (22): 5677-5677
被引量:37
摘要
Optical spin-orbit interaction has gained much interest recently due to its universality and importance in modern photonics. In this Letter, we theoretically demonstrate that orbit-induced localized spin angular momentum (SAM) conversion can occur in the tight focusing of spin-free linearly polarized vortex beams (LPVBs). By analysis of the polarization states that are associated with the SAM density, we attribute the occurrence of such a conversion to the helical-phase-induced change of local polarization states in the focused field. In the local SAM, density can be further regulated by altering the sign and value of the orbital angular momentum in the incident LPVBs, as well as their polarization orientations. This Letter is expected to advance our understanding of optical spin-orbit coupling and benefit applications of optical microscopy and trapping.
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