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.
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.
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.
Citation: 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.

微米级锥形光纤的近场光镊

Near-field optical tweezers based on micron tapered fiber

  • 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。

     

    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 m was transformed into a tapered fiber with a 2 m 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 m could keep balanced state, and the nearby microspheres were attracted onto the fiber surface and rolled at the speed of 5.3 m/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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