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
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
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.
Received: 31 March 2004
Revised: 18 December 2004
Accepted manuscript online:
PACS:
37.10.Vz
(Mechanical effects of light on atoms, molecules, and ions)
Fund: 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)
Cite this article:
Liu Chun-Xiang (刘春香), Guo Hong-Lian (郭红莲), Jiang Yu-Qiang (降雨强), Li Zhao-Lin (李兆霖), Cheng Bing-Ying (程丙英), Zhang Dao-Zhong (张道中) Oscillatory disturbance in force calibration of optical tweezers 2005 Chinese Physics 14 729
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