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Fractional optical vortex beam induced rotation of particles

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Abstract

We experimentally demonstrate optical rotation and manipulation of microscopic particles by use of optical vortex beams with fractional topological charges, namely fractional optical vortex beams, which are coupled in an optical tweezers system. Like the vortex beams with integer topological charges, the fractional optical vortex beams are also capable of rotating particles induced by the transfer of orbital angular momentum. However, the unique radial opening (low-intensity gap) in the intensity ring encompassing the dark core, due to the fractional nature of the beam, hinders the rotation significantly. The fractional vortex beam’s orbital angular momentum and radial opening are exploited to guide and transport microscopic particles.

©2005 Optical Society of America

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Supplementary Material (4)

Media 1: AVI (847 KB)     
Media 2: AVI (586 KB)     
Media 3: AVI (1339 KB)     
Media 4: AVI (1320 KB)     

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Figures (6)

Fig. 1.
Fig. 1. Schematic setup for the optical tweezers system.
Fig. 2.
Fig. 2. Patterns of the vortex beams on the sample stage of the microscope.
Fig. 3.
Fig. 3. Frames demonstrate that particles are rotating induced by: (a) (847 KB, movie for optical rotation) a vortex beam with l=3.3, and (b) (587 KB, movie for optical rotation) a vortex beam with l=3.4.
Fig. 4.
Fig. 4. Plot of the time for one cycle of rotation versus the topological charge of vortex beams.
Fig. 5.
Fig. 5. (1.3 MB, video for optical rotation) particles are rotating intrinsically, controlled by a vortex beam of l=-3.5.
Fig. 6.
Fig. 6. (a) (1.28 MB, video for optical aligning and guiding) with its OAM and opening slit, the vortex beam of l=3.5 is used for aligning and transporting particles. (b) Schematic illustration explaining the mechanism of the aligning and guiding with the vortex beam of l=3.5.

Equations (2)

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j z = 1 c 2 ( r × S ) z = [ r × iw ε 0 2 ( u * u u u * ) ] z
Γ z = P 2 πv l
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