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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Published on: August 31, 2021

Supercontinuum trap stiffness measurement using a confocal approach.

Zhe Zhang1, Haifeng Li, Peng Li

  • 1Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Optics Express
|December 18, 2010
PubMed
Summary

Researchers developed a new method to measure optical trap stiffness using supercontinuum light. This technique uses the fiber itself for tracking and scanning, achieving a lateral stiffness of 7.9 μN/m.

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Area of Science:

  • Optics and Photonics
  • Biophysics
  • Materials Science

Background:

  • Optical tweezers are crucial for manipulating microscopic objects.
  • Characterizing optical trap stiffness is essential for quantitative measurements.
  • Supercontinuum generation offers broadband light sources for advanced optical techniques.

Purpose of the Study:

  • To introduce a novel method for characterizing the stiffness of white light supercontinuum optical tweezers.
  • To utilize the supercontinuum generating fiber as an integrated component for trap manipulation and scanning.
  • To enable three-dimensional trap stiffness calibration.

Main Methods:

  • Employing a nonlinear photonic crystal fiber for both supercontinuum generation and as an integrated confocal pinhole.
  • Tracking the motion of a trapped bead to measure its response to the optical trap.
  • Utilizing the fiber as a scan head for rapid optical trap scanning.
  • Measuring the phase of the bead's motion to determine trap stiffness.

Main Results:

  • Achieved a lateral stiffness value of approximately 7.9 μN/m.
  • Operated with a supercontinuum power of around 75 mW.
  • Demonstrated the potential for trap stiffness calibration in arbitrary three-dimensional directions.

Conclusions:

  • The developed method provides an efficient way to characterize optical trap stiffness.
  • The integrated use of the photonic crystal fiber simplifies the optical tweezer setup.
  • This technique offers a promising approach for versatile 3D trap stiffness calibration.