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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Beyond the Hookean Spring Model: Direct Measurement of Optical Forces Through Light Momentum Changes.

Arnau Farré1,2, Ferran Marsà1,2, Mario Montes-Usategui3

  • 1Impetux Optics SL, Trias i Giró 15, 1-5, Barcelona, 08034, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|November 16, 2016
PubMed
Summary

Optical tweezers measure pN forces for biomolecular studies. A new direct method using light-momentum changes overcomes limitations of indirect force measurements in biophysics and cell biology.

Keywords:
Back-focal plane interferometryForce measurementsLight momentum methodOptical trapOptical tweezers

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Area of Science:

  • Biophysics
  • Cell Biology
  • Single-molecule studies

Background:

  • Optical tweezers are crucial for measuring pN forces in biophysical and cell biology.
  • Analyzing single-molecule interactions and motor protein forces provides insights into cellular functions.
  • Current methods, like indirect force sensing, have limitations in displacement range and application in living cells.

Purpose of the Study:

  • To present a direct force-sensing method for optical tweezers.
  • To overcome the constraints of indirect force measurement techniques.
  • To enable precise force measurements across the complete trap range, even at large displacements.

Main Methods:

  • Designing a force-sensor instrument based on light-momentum changes.
  • Utilizing a high-numerical-aperture objective lens for enhanced sensitivity.
  • Detailing construction, calibration, and operational steps for the instrument.

Main Results:

  • The proposed method offers a direct and precise way to determine forces.
  • It overcomes the limitations of the linear approximation used in indirect methods.
  • Enables force measurements even when displacements reach the trap's escape point.

Conclusions:

  • The light-momentum based force sensor provides a more versatile tool for biophysical and cell biological research.
  • This direct measurement technique expands the applicability of optical tweezers, particularly in complex biological systems.
  • The detailed design and calibration provide a pathway for implementing this advanced force-sensing capability.