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Related Experiment Videos

Trapping cavitation bubbles with a self-focused laser beam.

Jing Yong Ye1, Guoqing Chang, Theodore B Norris

  • 1Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109-2099, USA. jyye@eecs.umich.edu

Optics Letters
|October 6, 2004
PubMed
Summary

Laser-induced bubbles in water were trapped in a self-focused laser beam, defying expectations for low-index particles. Optical and acoustic methods confirmed this novel bubble trapping phenomenon.

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Area of Science:

  • Physics
  • Optics
  • Fluid Dynamics

Background:

  • Laser-induced cavitation bubbles are typically expected to be repelled by laser beams.
  • Conventional optical tweezers rely on gradient forces to trap high-refractive-index particles.
  • The behavior of low-refractive-index particles, like bubbles, in laser beams is less understood.

Purpose of the Study:

  • To investigate the trapping of laser-induced cavitation bubbles in a self-focused laser beam.
  • To experimentally determine the forces involved in bubble trapping.
  • To challenge the conventional understanding of optical trapping for low-index particles.

Main Methods:

  • Generation of laser-induced cavitation bubbles in water.
  • Utilizing a self-focused laser beam to attempt bubble trapping.

Related Experiment Videos

  • Employing optical imaging for real-time observation of bubble behavior.
  • Using acoustic detection to confirm the presence and trapping of bubbles.
  • Measuring transverse and longitudinal trapping forces.

    • Main Results:

    • Successfully trapped laser-induced cavitation bubbles within a self-focused laser beam.
    • Measured significant transverse trapping forces (up to 87 pN) and longitudinal forces (up to 11 pN).
    • Observed behavior contrary to the antitrapping predicted for low-index particles in conventional optical tweezers.

    Conclusions:

    • Demonstrated that laser-induced cavitation bubbles can be trapped in a self-focused laser beam.
    • Provided experimental evidence for forces capable of trapping low-index particles against conventional theory.
    • Opened new possibilities for manipulating bubbles and low-index particles using optical forces.