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Updated: Aug 29, 2025

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Temperature Quantification and Temperature Control in Optical Tweezers.

Joost J Geldhof1, Agata M Malinowska1, Gijs J L Wuite1

  • 1Department of Physics and Astronomy, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.

Methods in Molecular Biology (Clifton, N.J.)
|September 5, 2022
PubMed
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Optical tweezers use lasers to study biomolecules, but laser-induced heating can be an issue. This work details methods to identify, quantify, and control these thermal effects for accurate biomolecular investigations.

Area of Science:

  • Biophysics
  • Optical physics
  • Biotechnology

Background:

  • Optical tweezers are essential tools for studying biomolecules and their interactions.
  • Trapping biomolecules often involves attaching them to microscopic beads, which requires high-intensity lasers.
  • Laser-induced heating from optical absorption is an unavoidable consequence in optical tweezers systems.

Purpose of the Study:

  • To address the challenge of laser-induced heating in optical tweezers.
  • To provide methods for identifying, quantifying, and controlling thermal effects.
  • To enable accurate and reliable measurements in optical tweezers experiments.

Main Methods:

  • Overview of causes and effects of unwanted heating in optical tweezers.
  • Development of a temperature-independent trap calibration procedure.
Keywords:
Heat generationOptical tweezersTemperature controlTemperature quantificationThermal effectsTrap calibration

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  • Presentation and discussion of an effective temperature-control system.
  • Methods for measuring temperature at the optically trapped particle.

    • Main Results:

    • Identification and quantification of laser-induced heating effects.
    • Implementation of a temperature-independent calibration method.
    • Demonstration of an effective temperature-control system for optical tweezers.

    Conclusions:

    • Controlling thermal effects is crucial for accurate biomolecular studies using optical tweezers.
    • The presented methods and system allow for precise temperature management.
    • This work enhances the reliability and precision of optical tweezers applications.