| 微米级锥形光纤的近场光镊 |
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| 引用本文： | 赵宇,杨德超,陈浩,张安富,张文栋,薛晨阳,闫树斌.微米级锥形光纤的近场光镊[J].应用光学,2014,35(2):359-363. |
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| 作者姓名： | 赵宇 杨德超 陈浩 张安富 张文栋 薛晨阳 闫树斌 |
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| 作者单位： | 1.中北大学 仪器科学与动态测试教育部重点实验室,山西 太原 030051; |
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| 基金项目： | 国家自然科学基金(91123036, 61178058, 61275166);山西省自然科学基金(2010011003-2) |
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| 摘 要： | 分别从理论和实验上分析了光纤表面倏逝场强度的分布(z=10 nm, 100 nm, 500 nm,1 000 nm)，研究了微米级光纤光镊对微球的操纵。实验中把直径为125 m的普通单模光纤拉制成锥腰直径为2 m的锥形光纤。当光纤通光时，在光纤锥区倏逝场的作用下，直径3 m的聚苯乙烯微球保持平衡状态，并且光纤附近的微球被吸引到光纤表面，以5.3 m /s的速度沿着光束的传播方向运动。这个实验不仅实现了对微球的成功捕获，而且验证了光纤光镊的力学作用。光纤光镊对微球的无接触、无损伤操纵，将在生物传感领域有潜在的应用。
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| 关 键 词： | 近场光镊 倏逝场 锥形光纤 捕获 |
| 收稿时间： | 2013/11/5 |
Near-field optical tweezers based on micron tapered fiber |
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| ZHAO Yu,YANG De-chao,CHEN Hao,ZHANG An-fu,ZHANG Wen-dong,XUE Chen-yang,YAN Shu-bin.Near-field optical tweezers based on micron tapered fiber[J].Journal of Applied Optics,2014,35(2):359-363. |
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| Authors: | ZHAO Yu YANG De-chao CHEN Hao ZHANG An-fu ZHANG Wen-dong XUE Chen-yang YAN Shu-bin |
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| Affiliation: | 1.Key Laboratory of Instrumentation Science &Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;2.School of Instrument and Electronics,North University of China,Taiyuan 030051,China |
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| Abstract: | The evanescent field intensity distribution of the fiber was analyzed both theoretically and experimentally(z=10 nm, 100 nm, 500 nm,1 000 nm), and the manipulation of micron fiber optical tweezers for microspheres was studied in experiment. In the experiment, a single-mode optical fiber with a diameter of 125 μm was transformed into a tapered fiber with a 2 μm diameter at the minimum waist. When the laser light was launched into the fiber, due to the evanescent field of the tapered fiber, the polystyrene microspheres with a diameter of 3 μm could keep balanced state, and the nearby microspheres were attracted onto the fiber surface and rolled at the speed of 5.3 μm/s in the direction of light propagation. This experiment traps the microspheres and verifies the mechanical effect of the fiber optical tweezers. The non-contact, non-destructive manipulation of fiber optical tweezers for microspheres has potential applications in the field of biosensors. |
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| Keywords: | near-field optical tweezers evanescent field tapered fiber trapping |
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