Multifocal optical trapping using counter-propagating radially-polarized beams |
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| Authors: | Yaoju Zhang Yuxing Dai |
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| Institution: | 1. Department of Applied Biology, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;2. The Center for Advanced Biology, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;3. School of Life Science and Technology, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, 226-8501 Yokohama, Japan;4. Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;5. Cell Guidance Systems, Moneta Building, Babraham Research Campus, Cambridge, CB22 3AT, UK;6. Department of Orthopedic Surgery, Tokyo Medical University,6-7-1 Nishi-Shinjuku, Shinjuku-ku, 160-0023 Tokyo, Japan;7. The Center for Advanced Medical Engineering and Informatics, Osaka University, Yamadaoka, Suita, 565-0871 Osaka, Japan;8. Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine Kamigyo-ku, 465 Kajii-cho, Kawaramachi dori, 602-0841 Kyoto, Japan;9. The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, 606-8585 Kyoto, Japan |
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| Abstract: | A model of optical tweezers which can trap a chain of Rayleigh particles is proposed by using two counter-propagating equal highly focused radial polarized beams. Calculations show that a multifocal distribution along the optical axis is formed and the scattering force is equal to zero in the total focal filed, consequently a chain of metallic Rayleigh particles can be stably trapped. The trap force and the trap stiffness using two counter-propagating Radially-polarized beams are larger than those using two counter-propagating linearly-polarized beams. The trapping stability is calculated and analyzed in detail. The trapping number of particles in a trapping chain can be controlled by adjusting the aperture angle of the objective and the parameters of the filter used in the proposed trap system. |
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