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Proceedings Paper

Superposed oscillation in force calibrations driven by triangular-wave in optical tweezers system
Author(s): Honglian Guo; Chunxiang Liu; Yuqiang Jiang; Zhaolin Li; Bingying Cheng; Daozhong Zhang
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Paper Abstract

In force calibration, when triangular-wave input is exerted on the piezoelectric-driven substage, there is a damped oscillation superposed on the square-wave movement of the trapped bead in our experiments. This will bring about instability for well trapping bead and become the noise source of the bead signal. Consequently, the superposed vibration will influence the precision and the range of force that can be calibrated. In order to analyze derivation of the oscillation and solve it, a model of equivalent oscillator is put forward. Based on this model, we calculate the initial amplitude of oscillation and frequency spectra of the movement of trapped bead, which is well in agreement with the experimental one. We apply sinusoidal-wave input substituted for triangular one to the substage, as a result, oscillation disturbance is avoided effectively, so the trapping stability of optical trap increases and the range of calibrated force has been extended greatly.

Paper Details

Date Published: 18 October 2004
PDF: 10 pages
Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); doi: 10.1117/12.564524
Show Author Affiliations
Honglian Guo, Institute of Physics (China)
Ctr. for Condensed Matter Physics (China)
Chunxiang Liu, Institute of Physics (China)
Ctr. for Condensed Matter Physics (China)
Yuqiang Jiang, Shanxi Univ. (China)
Zhaolin Li, Institute of Physics (China)
Ctr. for Condensed Matter Physics (China)
Bingying Cheng, Institute of Physics (China)
Ctr. for Condensed Matter Physics (China)
Daozhong Zhang, Institute of Physics (China)
Ctr. for Condensed Matter Physics (China)


Published in SPIE Proceedings Vol. 5514:
Optical Trapping and Optical Micromanipulation
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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