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Related Experiment Video

Updated: May 30, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
08:48

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

Potential mapping of optical tweezers.

Tahmineh Godazgar1, Rouzbeh Shokri, S Nader S Reihani

  • 1Department of Physics, Institute for Advanced Studies in Basic Sciences, Zanjan 45195-1159, Iran.

Optics Letters
|August 18, 2011
PubMed
Summary

Optical tweezers measure piconewton forces, but bead size affects accuracy. Larger beads (>0.5 μm) cause underestimation due to trap stiffening, which is size-dependent and starts at higher forces.

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Area of Science:

  • Physics
  • Biophysics
  • Nanotechnology

Background:

  • Optical tweezers are widely used for precise force measurements in the piconewton range.
  • The stiffness of optical traps can change with bead displacement, potentially leading to force underestimation.

Purpose of the Study:

  • To investigate the phenomenon of optical trap stiffening.
  • To determine the relationship between bead size and the onset of trap stiffening.
  • To identify optimal bead sizes for simultaneous force and position sensing applications.

Main Methods:

  • Theoretical modeling of optical trap behavior.
  • Experimental validation using various bead sizes.
  • Analysis of force-displacement data from optical tweezers.

Main Results:

  • Trap stiffening occurs for beads larger than 0.5 μm in radius.
  • The displacement at which stiffening begins is dependent on bead size.
  • Larger beads exhibit stiffening at higher applied forces.

Conclusions:

  • Bead size significantly influences optical tweezer force measurement accuracy.
  • Mid-range sized beads (approx. 1.5 μm radius) are recommended for applications requiring simultaneous force and position sensing, such as biopolymer stretching.
  • Understanding bead-size-dependent stiffening is crucial for accurate force quantification in biophysics.

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