中国物理B ›› 2005, Vol. 14 ›› Issue (4): 729-733.doi: 10.1088/1009-1963/14/4/016

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Oscillatory disturbance in force calibration of optical tweezers

刘春香1, 郭红莲1, 李兆霖1, 程丙英1, 张道中1, 降雨强2   

  1. (1)Optical Physics Laboratory, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing,100080, China; (2)State Key Laboratory of Quantum Optics and Quantum Optics Devices, Department of Electronics and Information Technology,Shanxi University, Taiyuan,030006, China
  • 收稿日期:2004-03-31 修回日期:2004-12-18 出版日期:2005-04-20 发布日期:2005-03-28
  • 基金资助:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No 2002CB713805) and the National Natural Science Foundation of China (Nos 10174097 and 10374112)

Oscillatory disturbance in force calibration of optical tweezers

Liu Chun-Xiang (刘春香)a, Guo Hong-Lian (郭红莲)a, Jiang Yu-Qiang (降雨强)b, Li Zhao-Lin (李兆霖)a, Cheng Bing-Ying (程丙英)a, Zhang Dao-Zhong (张道中)a   

  1. a Optical Physics Laboratory, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b State Key Laboratory of Quantum Optics and Quantum Optics Devices, Department of Electronics and Information Technology,Shanxi University, Taiyuan 030006, China
  • Received:2004-03-31 Revised:2004-12-18 Online:2005-04-20 Published:2005-03-28
  • Supported by:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No 2002CB713805) and the National Natural Science Foundation of China (Nos 10174097 and 10374112)

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摘要： In the calibration of the optical trap stiffness, it is found that there appears an attenuating oscillation as an oscillatory disturbance added tothe trapped bead movement, when the scanner is driven by a triangular waveinput. An equivalent oscillator model is put forward to explain themechanism of the oscillatory disturbance. Both the measurements andcalculations show that the attenuating oscillation comes from theoscillation of the scanner and the triangular wave drive causes thisadditional oscillation of the scanner. Furthermore, the analysis indicatesthat the oscillatory disturbance will become stronger, when the stiffness ofthe trap increases or the natural frequency of the scanner decreases. Weadopt another driving way, i.e. a sinusoidal wave input is used instead ofthe triangular wave input. Our experiment has verified that in this case theoscillatory disturbance is eliminated completely.

Abstract: In the calibration of the optical trap stiffness, it is found that there appears an attenuating oscillation as an oscillatory disturbance added tothe trapped bead movement, when the scanner is driven by a triangular waveinput. An equivalent oscillator model is put forward to explain themechanism of the oscillatory disturbance. Both the measurements andcalculations show that the attenuating oscillation comes from theoscillation of the scanner and the triangular wave drive causes thisadditional oscillation of the scanner. Furthermore, the analysis indicatesthat the oscillatory disturbance will become stronger, when the stiffness ofthe trap increases or the natural frequency of the scanner decreases. Weadopt another driving way, i.e. a sinusoidal wave input is used instead ofthe triangular wave input. Our experiment has verified that in this case theoscillatory disturbance is eliminated completely.

Key words: optical tweezers, force calibration, oscillatory disturbance

中图分类号:  (Mechanical effects of light on atoms, molecules, and ions)

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