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Related Experiment Video

Updated: Oct 21, 2025

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies
06:53

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Published on: November 18, 2022

2.4K

Microsphere-coupled optical tweezers.

Mohammad Hossein Khosravi, Vahid Shahabadi, Faegheh Hajizadeh

    Optics Letters
    |September 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

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    This study demonstrates a novel optical trap using a microsphere to enhance particle trapping efficiency. This method allows trapping smaller particles with lower numerical aperture objectives, improving axial trapping performance.

    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Biophysics

    Background:

    • Optical tweezers are crucial for manipulating micro- and nanoparticles.
    • Conventional optical tweezers require high numerical aperture objectives for trapping small particles.
    • Improving trapping efficiency and accessibility is an ongoing research goal.

    Purpose of the Study:

    • To investigate the use of a dielectric microsphere to engineer an optical trap.
    • To theoretically and experimentally analyze the impact of the microsphere on trapping stiffness.
    • To enhance the trapping of small particles using a modified optical tweezers setup.

    Main Methods:

    • Utilizing a dielectric microsphere placed before the focal spot in a laser path.
    • Applying a theoretical model incorporating geometric phase shift into the Debye diffraction integral.

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    Last Updated: Oct 21, 2025

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    Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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  • Conducting experiments to validate the theoretical predictions and trapping capabilities.

    • Main Results:

    • Achieved stable trapping of 350 nm particles with a low numerical aperture objective (NA=0.7).
    • Demonstrated superior performance compared to conventional optical tweezers requiring NA=1.1.
    • Observed enhancement in axial trapping efficiency by a factor of ~3.8 with optimized microsphere and trapping depth.

    Conclusions:

    • The microsphere-coupled optical trap offers a more accessible and efficient method for particle manipulation.
    • This technique significantly lowers the requirements for optical components, broadening applications.
    • Further optimization of microsphere properties and trapping parameters can lead to even greater trapping enhancements.