Abstract

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.

© 2019 Optical Society of America

Understanding of transverse spin angular momentum in tightly focused linearly polarized vortex beams

Xiaohe Zhang, Bo Shen, Zhuqing Zhu, Guanghao Rui, Jun He, Yiping Cui, and Bing Gu
Opt. Express 30(4) 5121-5130 (2022)

Effect of optical spatial coherence on localized spin angular momentum density in tightly focused light [Invited]

Zixuan Wang, Chencheng Yan, Fei Wang, Yahong Chen, and Yangjian Cai
J. Opt. Soc. Am. A 39(12) C58-C67 (2022)

Spin-orbit Hall effect in the tight focusing of a radially polarized vortex beam

Hehe Li, Chenghao Ma, Jingge Wang, Miaomiao Tang, and Xinzhong Li
Opt. Express 29(24) 39419-39427 (2021)

Orbit-induced localized spin angular momentum in the tight focusing of linearly polarized vortex beams

Panpan Yu, Qian Zhao, Xinyao Hu, Yinmei Li, and Lei Gong
Opt. Lett. 43(22) 5677-5680 (2018)

Mapping the spin angular momentum distribution of focused linearly and circularly polarized vortex fields

Xiaojin Yin, Chen Yang, Jinhong Li, Yakai Zhang, and Chungang Zhao
Appl. Opt. 61(1) 115-119 (2022)