Experimental conditions dependence of trap stiffness in optical tweezers

Hong Tao Chen, Yin Mei Li, Li Ren Lou, Zan Gong, Jun Qiu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The measurement of tiny force is an important function of the optical tweezers, for which the trap stiffness plays a key role in the measurement. In this paper, the results of the experimental study on the regulation are reported that the trap stiffness changes with experimental conditions. The results show that the trap stiffness is linearly dependent on the laser power and decreases with the trap height increasing of the bead. In addition, it decreases along with the diameter increase of the trapped bead. The results are qualitatively discussed. The accuracy and range of force measurement are also analyzed.

Original languageEnglish (US)
Pages (from-to)1361-1366
Number of pages6
JournalZhongguo Jiguang/Chinese Journal of Lasers
Issue number11
StatePublished - Nov 1 2004
Externally publishedYes


  • Femtonewton/piconewton force
  • Measurement and metrology
  • Optical-tweezers
  • Trap stiffness

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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