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.
SUN Hong
,
DONG Guangjiong
. Spin density of tightly focused hybrid-order Poincaré beams[J]. Journal of East China Normal University(Natural Science), 2020
, 2020(2)
: 70
-75
.
DOI: 10.3969/j.issn.1000-5641.201922012
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中国综合性科技类核心期刊(北大核心)