Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (1): 81-95.doi: 10.3969/j.issn.1007-5461.2022.01.005

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Review of spin-orbit angular momentum interaction in tightly focused fields

WU Yijing 1 , YU Panpan 1 , LIU Yifan 1 , WANG Ziqiang 1 , LI Yinmei 1,2 , GONG Lei 1,2∗   

  1. ( 1 Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China; 2 Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, China )
  • Received:2021-10-06 Revised:2021-11-16 Published:2022-01-28 Online:2022-01-28

Abstract: Light can carry both spin and orbital angular momenta, which are determined by light’s polarization and spatial degrees of freedom respectively. In paraxial fields, optical spin and orbital angular momenta are mutually independent and conserved under free-space propagation. By contrast, in nonparaxial fields, such as tightly focused or scattered fields, the coupling and transformation between the spin and orbital angular momenta occur. Particularly, because it is widely involved in applications such as optical trapping, microscopy and sensing, spin-orbit interactions (SOIs) occurring in tight focusing systems have gained much attention recently. This review presents the theoretical calculation of spin and orbital angular momenta in the tightly focused fields, reveals the relationship between SOIs and the incident structured light fields, and briefly introduces the latest progress of the related applications.

Key words: Fourier optics, tight focusing, spin angular momentum, orbital angular momentum, spinorbital angular momentum interaction, optical trapping

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