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Related Experiment Video

Updated: Jun 22, 2026

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

Published on: August 31, 2021

Quantitative force mapping of an optical vortex trap.

Yiqiong Zhao, Graham Milne, J Scott Edgar

    Applied Physics Letters
    |May 30, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    This study quantifies forces on particles in optical vortex traps. A new model accurately predicts these forces by considering light diffraction and interface aberrations.

    Area of Science:

    • Physics
    • Optical trapping
    • Nanotechnology

    Background:

    • Optical vortex traps use focused laser beams to manipulate microscopic particles.
    • Accurate force measurement is crucial for understanding particle behavior in optical traps.

    Purpose of the Study:

    • To develop a quantitative force mapping model for micron-sized particles in optical vortex traps.
    • To achieve precise agreement between theoretical predictions and experimental force measurements.

    Main Methods:

    • Utilizing an optical vortex trap to hold micron-sized particles.
    • Developing a model that incorporates diffraction, spherical aberration, and multidipole approximation for force calculations.
    • Comparing model predictions with experimentally measured force maps.

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    Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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    Last Updated: Jun 22, 2026

    Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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    Optical Trap Loading of Dielectric Microparticles In Air
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    Optical Trap Loading of Dielectric Microparticles In Air

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    Main Results:

    • Successfully mapped forces on particles within an optical vortex trap.
    • The developed model demonstrated quantitative agreement with experimental force map data.
    • The model efficiently accounts for optical field diffraction and interface-induced aberrations.

    Conclusions:

    • The presented model offers a simple and efficient method for quantitative force mapping in optical vortex traps.
    • This approach enhances the understanding and predictability of particle manipulation in optical tweezers.
    • The findings have implications for microparticle manipulation and metrology.