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Related Experiment Video

Updated: Jun 5, 2026

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

Optofluidic tweezer on a chip.

K Ono, S Kaneda, T Shiraishi

    Biomicrofluidics
    |January 27, 2011
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optofluidic optical tweezer in a microchannel. The method uses liquid flow patterns to control light paths for precise microsphere manipulation.

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    Area of Science:

    • Optofluidics
    • Microfluidics
    • Optical Tweezers
    • Biophotonics

    Background:

    • Optical tweezers are essential tools for manipulating microscopic objects.
    • Existing optical tweezer methods often lack integrated fluidic control.
    • Optofluidic systems offer unique advantages for integrated optical manipulation.

    Purpose of the Study:

    • To propose and demonstrate a novel optofluidic method for optical tweezer operation within a microchannel.
    • To utilize controllable liquid interfaces for manipulating optical paths.
    • To achieve precise manipulation of microscopic particles using an integrated system.

    Main Methods:

    • An optical fiber delivers light through polydimethylsiloxane-air surface lenses into an optofluidic region within a microchannel.

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  • Two liquids with different refractive indices (RIs) are introduced into the control channel, creating laminar or segmented flow patterns.
  • Altering the liquid interface shapes dynamically controls the light's optical path.

    • Main Results:

    • Demonstrated successful optical tweezer operation on a chip.
    • Successfully trapped a 25 μm diameter microsphere.
    • Achieved precise displacement of the trapped microsphere by 15 μm through flow pattern modulation.

    Conclusions:

    • The proposed optofluidic method enables effective control of optical tweezers via liquid flow manipulation.
    • This technique offers a novel approach for integrated particle manipulation in microfluidic devices.
    • The demonstrated capabilities highlight potential applications in microscale assembly and biological studies.