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Updated: Apr 15, 2026

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Optically Trapping Large Metallic Particles in Air Using a 'Boat' Trap with Direct-Drawn Sidewalls.

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  • 1Ira A. Fulton College of Engineering, Brigham Young University.

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Researchers developed a novel optical trapping method using a scanned laser to create a

Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Optical trapping typically struggles with large metallic particles due to their strong scattering and absorption properties.
  • Existing methods often lack stability or require complex configurations for handling micron-sized objects.

Purpose of the Study:

  • To demonstrate a stable optical trapping technique for large metallic particles (>1.16 µm gold, >100 µm conductor-coated microspheres).
  • To develop a flexible method for capturing, loading, and translating airborne particles using a 'boat' trap.
  • To enable plasmonic enhancement studies with levitated metallic nanoparticles.

Main Methods:

  • Utilizing a high-power continuous-wave 532 nm laser focused and scanned by acousto-optic modulators.
  • Creating a parabolic trap cross-section in air, forming an open-top 'boat' trap.

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  • Optimizing scanning frequency for stable trapping and minimizing trap distortion.

    • Main Results:

    • Achieved stable optical trapping of large metallic particles, including solid gold and conductor-coated microspheres.
    • Demonstrated the 'boat' trap's capability to catch, load, and hold particles without hopping.
    • Validated trap formation and stability using carbon-coated microspheres and solid gold nanoparticles.

    Conclusions:

    • The 'boat' trap offers a robust and flexible approach for manipulating airborne metallic particles over extended periods.
    • This method facilitates real-time control over trap geometry for diverse particle manipulation tasks.
    • Potential applications include plasmonic enhancement in levitated optical systems and advanced nanoparticle manipulation.