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  • Received: Aug. 31, 2020

    Accepted: Sep. 11, 2020

    Posted: Dec. 10, 2020

    Published Online: Jan. 4, 2021

    The Author Email: Xiaoyan Pang (xypang@nwpu.edu.cn), Xinying Zhao (zhaoxinyingxy@163.com)

    DOI: 10.3788/COL202119.022601

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    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

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Chinese Optics Letters, Vol. 19, Issue 2, 022601 (2021)

Evolution of spin density vectors in a strongly focused composite field

Xiaoyan Pang1,*, Chen Feng1, and Xinying Zhao2,**

Author Affiliations

  • 1School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
  • 2School of Physics & Information Technology, Shaanxi Normal University, Xi’an 710061, China

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 ys direction on the ys axis. This behavior is governed by the Gouy phase difference between the field polarization components. The 60° 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.

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