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Separation of spin angular momenta in focal region mediated through phase vortex
CHEN Hao,HAO Jingjing,DING Jianping * #
National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093
*Correspondence author
#Submitted by
Subject:
Funding: National Natural Science Foundation of China （No.Grant Nos. 10874078,11074116 and 1093400）, Specialized Research Fund for the Doctoral Program of Higher Education of China （No.Grant No. 20090091110012)）
Opened online:16 March 2012
Accepted by: none
Citation: CHEN Hao,HAO Jingjing,DING Jianping.Separation of spin angular momenta in focal region mediated through phase vortex[OL]. [16 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4470897
 
 
The spatial trajectory of the light beams is affected by their spin angular momentum (SAM) via spin-orbit interaction. We show that the separation of spin angular momentum flux in the focal region can occur at the focal plane illuminated by a space-variant linearly polarized beam with phase vortex. Such a beam carrying only the orbital angular momentum (OAM) but no SAM can develop a net SAM flux upon focusing. The radial split of the SAM flux density is mediated by the phase vortex (or OAM) and can be controlled by the topological charge of the phase vortex. The numerical simulation and the optical trapping experiment have been performed to validate the separation of the SAM flux density.
Keywords:Optical vortex; Angular momentum; Vector beam; Focus; Optical micromanipulation
 
 
 

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