Chinese Optics Letters, 2021, 19 (2): 022601, Published Online: Jan. 4, 2021
Evolution of spin density vectors in a strongly focused composite field Download: 655次
Abstract
The evolution of the spin density vectors (SDVs) is studied in a strongly focused composite field. It is found that the SDVs can be spiral along the propagation axis, and they are perpendicular to the direction on the axis. This behavior is governed by the Gouy phase difference between the field polarization components. The rotation of the spatial distribution of the transverse SDVs is also generated, which is found to be controlled by the Gouy phase difference between the field orbital angular momentum modes. Additionally, the spin density singularities are observed in the evolution of the SDVs.
Xiaoyan Pang, Chen Feng, Xinying Zhao. Evolution of spin density vectors in a strongly focused composite field[J]. Chinese Optics Letters, 2021, 19(2): 022601.