| Analysis of Trapping Force and Torque for Fiber-optical Trap by the Finite-differential Time-domain (FDTD) Method |
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| 作者姓名： | BAI Ming LU Yonghua ZHANG Jiangying LIU Kai MING Hai |
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| 作者单位： | Department of Physics，University of Science and Technology of China，Hefei 230026，China |
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| 基金项目： | SupportedbytheNationalNaturalScienceFoundationofChina (No .19974 0 4 2)，NationalResearchFundfor
FundamentalKeyProjects (No.973(G19990 330 ) ) . |
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| 摘 要： | 1 Ｉｎｔｒｏｄｕｃｔｉｏｎ ＳｉｎｃｅＡｓｈｋｉｎｅｔａｌ.1] ｐｒｏｐｏｓｅｄｔｈｅｏｐｔｉｃａｌｔｒａｐｐｉｎｇｏｆｄｉｅｌｅｃｔｒｉｃｐａｒｔｉｃｌｅｓｂｙａｓｉｎｇｌｅ ｂｅａｍｇｒａｄｉｅｎｔｆｏｒｃｅｔｒａｐ ,ｏｐｔｉｃａｌｔｗｅｅｚｅｒｓｔｅｃｈｎｏｌｏｇｙａｒｏｕｓｅｄｔｈｅｉｎｔｅｒｅｓｔｏｆｒｅｓｅａｒｃｈｅｒｓ,ｈｏｗｅｖｅｒｔｈｅｉｒａｔｔｅｎｔｉｏｎｗａｓｃｏｎｃｅｎｔｒａｔｅｄｏｎｈｉｇｈＮＡｍｉｃｒｏｌｅｎｓｔｗｅｅｚｅｒｓ.Ｏｐｔｉｃａｌｔｒａｐｐｉｎｇｔｅｃｈｎ…
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| 关 键 词： | fiber optical trapping FDTD method Maxwell′s stress tensor |
| 收稿时间： | 2001/3/12 |
Analysis of Trapping Force and Torque for Fiber-optical Trap by the Finite-differential Time-domain (FDTD) Method |
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| BAI Ming,LU Yonghua,ZHANG Jiangying,LIU Kai,MING Hai.Analysis of Trapping Force and Torque for Fiber-optical Trap by the Finite-differential Time-domain (FDTD) Method[J].中国激光(英文版),2002,11(3):169-172. |
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| Authors: | BAI Ming LU Yonghua ZHANG Jiangying LIU Kai MING Hai |
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| Abstract: | In this paper,the FDTD method is used to calculate the light field distribution in an uncoated fiber probe with a small dielectric particle. By integrating Maxwell′s stress tensor in the FDTD calculation,the time-averaged force exerted on the dielectric particles with different sizes and at different positions is obtained. The calculation results are also verified experimentally. The force near the axis in the vicinity of the tip is about 10-14 N for the incident 10 mW laser of 980 nm. Furthermore,the torque exerting on an ellipsoidal dielectric particle by focusing light field with two fiber probes is calculated and the dependence of this torque on both the declination angle of the ellipsoidal particle and the incident laser power ratio of the two probes is obtained. The detailed intensity map within the particle is also given. |
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| Keywords: | fiber-optical trapping FDTD method Maxwell′s stress tensor |
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