Separation of spin angular momentum in space-variant linearly polarized beam
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We show that the spin angular momentum (SAM) flux in a space-variant linearly polarized beam can be separated in the focal plane. Such a beam carries only orbital angular momentum (OAM) and develops a net SAM flux upon focusing. The radial splitting 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. Optical trapping experiments verify the separation of the SAM flux density. The proposed approach enriches the manipulation of the angular momentum of light fields and inspires more designs of focus engineering, which would benefit optical micromanipulation of microscopic particles.
KeywordsOrbital Angular Momentum Topological Charge Polarization Vortex Sodium Dodecyl Sulfate Solution Spin Angular Momentum
This work was supported in part by the National Natural Science Foundation of China (Grant Nos. 11074116, 10934003, and 11274158), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090091110012), and the National Basic Research Program (973 Program) of China (Grant No. 2012CB921900).
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