Journal of East China Normal University(Natural Science) ›› 2020, Vol. 2020 ›› Issue (2): 70-75.doi: 10.3969/j.issn.1000-5641.201922012

• Physics and Electronics • Previous Articles     Next Articles

Spin density of tightly focused hybrid-order Poincaré beams

SUN Hong, DONG Guangjiong   

  1. State Key Laboratory of Precision Spectoscopy, East China Normal University, Shanghai 200062, China
  • Received:2019-05-02 Published:2020-03-16

Abstract: Research on spin of Poincaré beams not only has practical engineering applications, but is also important for understanding the nature of light. In this paper, we study the spin density of the tightly focused hybrid-order Poincaré beams (TFPB) and find that it has both longitudinal and transverse components. Unlike tightly focused full Poincaré beams whose longitudinal spin density is on average zero, the total longitudinal spin density of tightly focused hybrid-order Poincaré beams is not zero. The spin density of TFPB has rich controllable spatial patterns; in particular, the longitudinal spin density can be either a ring shape or a regular polygon. These features can be used to separate chiral particles or to manipulate dynamics of ultracold spinot gases.

Key words: hybrid-order Poincaré beams, tightly focused, spin density

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