Optical sorting using an array of optical vortices with fractional topological charge |
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Authors: | Cheng-Shan Guo Ya-Nan Yu Zhengping Hong |
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Institution: | Department of Physics, Shandong Normal University, Jinan 250014, China |
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Abstract: | An array of optical vortices with fractional topological charge is generated using a phase-only Talbot array illuminator and used to sort microparticles. Our theoretical analysis and experimental results reveal that when a particle passes through a fractional vortex array, it will be driven by two forces, intensity-gradient force and phase-gradient force, and the cooperation of these two forces can improve its ability in optical sorting because of the special intensity and phase distribution of the fractional optical vortex array. Larger angle separation could be obtained with moderate laser power. |
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Keywords: | Optical sorting Optical vortices Talbot array illuminators |
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