| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Optical Trapping of Double-Ring Radially Polarized Beam with Improved Axial Trapping Efficiency |
| YAO Bao-Li, YAN Shao-Hui, YE Tong, ZHAO Wei |
| State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119 |
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| Cite this article: |
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YAO Bao-Li, YAN Shao-Hui, YE Tong et al 2010 Chin. Phys. Lett. 27 108701 |
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Abstract Radially polarized beams, focused by a high numerical aperture (NA) objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in comparison with linearly polarized beams. We propose a design for converting a lowest-order radially polarized beam (R-TEM01) to a double−ring radial polarization distribution (DR R-TEM01) through a specially designed polarization rotator. The phases of the two rings of this beam differ by π. Numerical results evaluated by rigorous T−matrix method show that the DR R-TEM01 beam can improve the axial trapping efficiency compared with the R−TEM01 beam, provided that the size of trapped particles is of order of the wavelength of the beam.
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| Keywords:
87.80.Cc
42.25.Fx
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Received: 08 April 2010
Published: 26 September 2010
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