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Related Experiment Videos

Interferometric tracking of optically trapped probes behind structured surfaces: A phase correction method.

Peter C Seitz1, Ernst H K Stelzer, Alexander Rohrbach

  • 1European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany. p.seitz@gmx.net

Applied Optics
|September 20, 2006
PubMed
Summary
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We developed a method to correct for phase disturbances affecting optical particle tracking. This ensures accurate measurements of particle position and forces in optical traps.

Area of Science:

  • Optical physics
  • Nanotechnology
  • Biophysics

Background:

  • Optical tweezers are crucial for manipulating and measuring forces on microscopic particles.
  • Accurate tracking of particle position is essential for reliable measurements.
  • Phase disturbances can introduce significant errors in optical tracking data.

Purpose of the Study:

  • To investigate the impact of an additional scatterer on optical trap tracking signals.
  • To develop and validate a method for correcting phase-induced errors in particle position measurements.
  • To ensure the accuracy of interaction potentials and forces derived from optical trapping experiments.

Main Methods:

  • Utilizing interferometric detection with a quadrant photodiode for nanometer-precision particle localization.

Related Experiment Videos

  • Implementing a novel procedure to measure and correct for phase disturbances.
  • Validating the phase correction approach by inducing a defined displacement of the trapped particle.

    • Main Results:

    • Demonstrated that phase disturbances lead to erroneous position signals and inaccurate force calculations.
    • Successfully implemented a phase correction technique based on measuring the interferometric signal.
    • Verified the effectiveness of the correction method through controlled experiments.

    Conclusions:

    • The developed phase correction method accurately compensates for disturbances in optical particle tracking.
    • This technique enhances the reliability of measurements in optical trapping, particularly in the presence of sample-induced phase variations.
    • Accurate force and potential measurements are achievable with the implemented phase correction strategy.