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Related Experiment Video

Updated: Oct 20, 2025

Fabrication and Testing of Miniature Automatic Photophoretic Trapping Rigs
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Fabrication and Testing of Miniature Automatic Photophoretic Trapping Rigs

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Ring-shaped optical trap based on an acousto-optic tunable spatial filter.

Dmitry V Obydennov, Konstantin B Yushkov, Vladimir Ya Molchanov

    Optics Letters
    |September 15, 2021
    PubMed
    Summary

    Researchers developed a new annular optical trap using an acousto-optic tunable spatial filter. This system allows precise control over particle arrangements, enabling circular patterns and dynamic adjustments of the trap size.

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    Area of Science:

    • Optics
    • Photonics
    • Microscopy

    Background:

    • Optical tweezers are crucial for manipulating microscopic particles.
    • Existing optical trap designs can be limited in dynamic control and pattern formation.

    Purpose of the Study:

    • To propose and validate a novel annular optical trap design.
    • To demonstrate dynamic control over particle arrangement and trap dimensions.

    Main Methods:

    • Utilized an acousto-optic tunable spatial filter for optical trap generation.
    • Employed polystyrene microspheres for experimental validation.
    • Implemented programmable frequency-swept control for dynamical adjustments.

    Main Results:

    • Successfully arranged freely floating particles into controllable circular patterns.

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  • Demonstrated particle aggregation and disaggregation within the trap.
  • Achieved dynamical adjustment of the trapping field potential diameter.

    • Conclusions:

    • The proposed annular optical trap offers precise and dynamic control over microparticle manipulation.
    • This novel scheme provides a versatile platform for applications in micro-assembly and fundamental physics studies.