| Systematical study of the trapping forces of optical tweezers formed by different types of optical ring beams |
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| 作者姓名： | 徐升华 李银妹 楼立人 |
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| 作者单位： | National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China;Department of Physics, University of Science and Technology of China, Hefei 230026 China;National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China;Department of Physics, University of Science and Technology of China, Hefei 230026 China;Department of Physics, University of Science and Technology of China, Hefei 230026 China |
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| 基金项目： | Project supported by the National
Natural Science Foundation of China (Grant Nos 20273065 and 10474094)
and `the Knowledge Innovation Program' of Chinese Academy of
Sciences. |
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| 摘 要： | The technique of optical tweezers has been improved a lot since its invention, which extends the application fields of optical tweezers. Besides the conventionally used Gaussian beams, different types of ring beams have also been used to form optical tweezers for different purposes. The two typical kinds of ring beams used in optical tweezers are the hollow Gaussian beam and Laguerre-Gaussian （LG） beam. Both theoretical computation and experiments have shown that the axial trapping force is improved for the ring beams compared with the Gaussian beam, and hence the trapping stability is improved, although the transverse trapping forces of ring beams are smaller than that of Gaussian beam. However, no systematic study on the trapping forces of ring beam has ever been discussed. In this article, we will investigate the axial and transverse trapping forces of different types of ring beams with different parameters systematically, by numerical computation in which the ray optics model is adopted. The spherical aberration caused by the refractive index mismatch between oil and water is also considered in the article. The trapping forces for different objectives that obey the sine condition and tangent condition are also compared with each other. The result of systematical calculation will be useful for the applications of optical tweezers formed by different types of ring beams.
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| 关 键 词： | 俘获力 球面像差 光学镊子 高斯光束 |
| 收稿时间： | 7/6/2005 12:00:00 AM |
| 修稿时间： | 2005-07-062006-02-24 |
Systematical study of the trapping forces of optical tweezers formed by different types of optical ring beams |
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| Xu Sheng-Hu,Li Yin-Mei and Lou Li-Ren.Systematical study of the trapping forces of optical tweezers formed by different types of optical ring beams[J].Chinese Physics B,2006,15(6):1391-1397. |
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| Authors: | Xu Sheng-Hu Li Yin-Mei and Lou Li-Ren |
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| Institution: | Department of Physics, University of Science and Technology of China, Hefei 230026 China; National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China;Department of Physics, University of Science and Technology of China, Hefei 230026 China |
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| Abstract: | The technique of optical tweezers has been improved a lot since its
invention, which extends the application fields of optical tweezers. Besides
the conventionally used Gaussian beams, different types of ring beams have also been
used to form optical tweezers for different purposes. The two typical
kinds of ring beams used in optical tweezers are the hollow Gaussian beam and
Laguerre--Gaussian (LG) beam. Both theoretical computation and experiments
have shown that the axial trapping force is improved for the ring beams
compared with the Gaussian beam, and hence the trapping stability is
improved, although the transverse trapping forces of ring beams are smaller
than that of Gaussian beam. However, no systematic study on the trapping
forces of ring beam has ever been discussed. In this article, we will investigate
the axial and transverse trapping forces of different types of ring beams
with different parameters systematically, by numerical computation in which
the ray optics model is adopted. The spherical aberration caused by the
refractive index mismatch between oil and water is also considered in the
article. The trapping forces for different objectives that obey the sine
condition and tangent condition are also compared with each other.
The result of systematical calculation will be useful for the applications
of optical tweezers formed by different types of ring beams. |
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| Keywords: | optical tweezers trapping force spherical aberration |
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