Simulation and experiments of near-field trapping using metal-coated optical fiber probe

LIU Bing-hui; YANG Li-jun; WANG Yang

doi:10.3788/OPE.20111910.2355

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Simulation and experiments of near-field trapping using metal-coated optical fiber probe

Article | 更新时间：2020-08-12

- Simulation and experiments of near-field trapping using metal-coated optical fiber probe
- Optics and Precision Engineering Vol. 19, Issue 10, Pages: 2355-2365(2011)
- 作者机构：
  
  1. 哈尔滨工业大学机电工程学院,黑龙江哈尔滨,150001
  2. 哈尔滨工业大学机器人技术与系统国家重点实验室,黑龙江哈尔滨,150080
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111910.2355
  CLC： TN253
- Received：12 January 2011，
  
  Revised：18 February 2011，
  
  Published Online：27 October 2011，
  
  Published：25 October 2011
- 稿件说明：
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刘炳辉, 杨立军, 王扬. 镀膜光纤探针近场捕获的模拟与实验[J]. 光学精密工程, 2011,19(10): 2355-2365

LIU Bing-hui, YANG Li-jun, WANG Yang. Simulation and experiments of near-field trapping using metal-coated optical fiber probe[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2355-2365
刘炳辉, 杨立军, 王扬. 镀膜光纤探针近场捕获的模拟与实验[J]. 光学精密工程, 2011,19(10): 2355-2365 DOI： 10.3788/OPE.20111910.2355.

LIU Bing-hui, YANG Li-jun, WANG Yang. Simulation and experiments of near-field trapping using metal-coated optical fiber probe[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2355-2365 DOI： 10.3788/OPE.20111910.2355.

摘要

为提高近场捕获的能力与灵活性

研究了一种利用镀膜光纤探针对纳米微粒进行近场捕获的方法。采用麦克斯韦应力张量和三维时域有限差分方法建立了近场中纳米微粒的作用力模型

通过光阱力与其他作用力的比较讨论了近场捕获的稳定性

并根据各轴向光阱力的分布情况分析了纳米微粒的捕获尺寸与捕获位置。结果表明

只有当微粒尺寸小于探针孔径时才存在捕获效果

探针尖端不同位置出现不同捕获过程

在光阱力的作用下微粒最终被捕获至孔径边缘并形成圆状分布。结合纳米定位与检测方法

设计了全光纤低损耗的光纤探针近场捕获系统

并对120 nm的聚苯乙烯微粒进行了捕获实验。结果表明

采用极低的激光功率能把粒径为激光波长1/7的纳米微粒捕获至光纤探针尖端

并形成内径与探针孔径一致的圆环状分布。该计算与实验结果为近场纳米操作的实验研究打下了基础。

Abstract

A near-field trapping method for nanoparticles by a metal-coated optical fiber probe is proposed to improve the nanomanipulation technology. By applying a Maxwell stress tensor and 3D Finite Difference Time Domain(FDTD) methods

the physical properties of trapping stability

particle sizes and trapping positions in the near-field trapping are revealed. The effect of trapping forces acted on a nanoparticle along three axis directions on the trapping positions is studied

and different trapping positions are generated in the aperture edge in polarization direction and the center surface of the probe tip. Numerical results indicate that the Near-field Scanning Optical Microscopy (NSOM) probe is able to trap nanoparticles in a circular shape with lower laser intensity (~1040 W/mm

) than that (~10

W/mm

) required by a conventional optical manipulator. A near-field optical trapping system using the tapered metal-coated fiber probe is designed. A NSOM probe

a polarized semiconductor laser and a laser scanning confocal microscope are applied to pushing the trapping resolution further down to 120 nm. In experiments

120-nm polystyrene particles are trapped in multi-circular shape with a minimum size of 400 nm at a resolution of /7 (: laser wavelength) and

(

: tip diameter of NSOM probe)

respectively

which agrees well with the simulated result. The method proposed in the paper largely promotes the role of near-field optical manipulation.

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references

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