The Optical Angular Momentum in a Vector Vortex Optical Field
We study the propagation dynamics of vortex vector field with azimuthally locally uniform and inhomogeneous polarization states by using angular spectrum the electromagnetic beam. The evolution of the polarization states in the field cross section is analyzed numerically in detail during propagation by using the Stokes polarization parameters. The results indicate that the polarization states in the field cross section rotate along the propagation axis due to the existence of vortex field. In particular, the interaction between the central phase singular point (i.e., dislocation) and the polarization singular point (i.e., disclination) leads to the creation or annihilation of optical field in the center of optical field, depending on the number of vortex and polarization topological charges. The transverse energy flux distributions and both spin and orbital optical angular momentum of vector vortex optical field with the different states of polarization in the cross-section of the field are computed and analyzed. Our results indicate that the different states of polarization in the cross-section of the optical vector vortex field can influence and reconstruct the transverse Poyting vector (energy flux) and both spin and orbital optical angular momentum flux distribution in the cross-section of the field. These results, therefore, provide useful information on how to spatially manipulate the angular momentum of laser beams by choosing appropriate states of polarization in the cross-section of the field. This work provides further insight into dynamic behaviors of the vector vortex optical field and sheds light on a new approach in manipulating micro-particles.
Rui-Pin Chen
Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310028, China
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1870-1872
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）