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Pulsed lasers precisely manipulate Janus particles by influencing their motion and position. Nanosecond-pulsed laser interactions reveal distinct energy regimes, enabling controlled movement and understanding laser-particle dynamics.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optics

Background:

  • Janus particles offer unique properties for optical manipulation.
  • Understanding laser operation regimes is crucial for controlling particle behavior.

Purpose of the Study:

  • Investigate nanosecond-pulsed laser interactions with gold Janus particles.
  • Characterize particle behavior across different laser pulse energy regimes.

Main Methods:

  • Utilized nanosecond-pulsed lasers to interact with 4.1 μm Au-Janus particles.
  • Observed particle motion and analyzed behavior under varying pulse energies (low, medium, high).
  • Measured translation velocities and identified ablation thresholds.

Main Results:

  • Identified three distinct pulse energy regimes influencing Brownian motion, extended motion, and superdiffusion.
  • Established a 4 nJ threshold for optical manipulation against the laser spot, achieving velocities up to 5.1 μm/s.
  • Observed gold cap damage and ablation at 20 nJ, generating smaller gold particles.

Conclusions:

  • Nanosecond-pulsed lasers enable precise and power-efficient manipulation of Janus particles.
  • Findings advance the understanding of laser-particle interactions and optical manipulation applications.
  • Demonstrated potential for controlled movement and material modification using pulsed lasers.