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Dynamics of Pulsed-Laser Interaction with Janus Particles
Alireza Khoshzaban1, Alessandro Magazzú2, Maria Grazia Donato2
1Institute of Biomedical Engineering, Boğaziçi University, 34684 Istanbul, Turkey.
ACS Photonics
|April 21, 2025
Summary
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.
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.
