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Updated: Nov 15, 2025

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Nanoparticle Assembling Dynamics Induced by Pulsed Optical Force.

Jim Jui-Kai Chen¹, Wei-Yi Chiang^1,2, Tetsuhiro Kudo¹

¹Department of Applied Chemistry, National Chiao Tung University, 1001, Ta Hsueh Rd., Hsinchu, 30010, Taiwan.

Chemical Record (New York, N.Y.)

|March 4, 2021

Summary

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This summary is machine-generated.

Femtosecond laser trapping of nanoparticles shows distinct assembly, ejection, and bubbling dynamics. These pulsed optical force characteristics offer a new platform for novel material fabrication methods.

Area of Science:

Optical trapping
Nanoparticle dynamics
Laser-matter interactions

Background:

Continuous Wave (CW) laser trapping provides a baseline for nanoparticle manipulation.
Understanding nanoparticle behavior under pulsed lasers is crucial for advanced applications.

Purpose of the Study:

To investigate and compare femtosecond (fs) laser trapping dynamics of silica, modified silica, and polystyrene nanoparticles (NPs) in aqueous solution.
To elucidate the mechanisms behind nanoparticle assembly, ejection, and bubble generation under fs laser irradiation.

Main Methods:

Utilized femtosecond (fs) and continuous wave (CW) lasers for optical trapping experiments.
Analyzed nanoparticle behavior, including confinement, ejection, and ablation, under varying laser powers.

Keywords:

Optical trapping femtosecond laser nanoparticle optical assembling optical force

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Calculated optical forces (scattering, gradient, temporal) to map force dynamics on single polystyrene nanoparticles.

Main Results:

Femtosecond laser trapping resulted in tight confinement and assembly ejection for silica NPs, distinct from CW trapping.
Hydrophobically modified silica and polystyrene NPs exhibited sequential ejection or ablation with bubble formation under fs laser.
Ejection and bubbling occurred perpendicular to laser polarization, with random direction switching, attributed to asymmetric optical potential.
Force analysis revealed that increased assembly volume and propagation-aligned pushing forces led to ejection, followed by fs multiphoton absorption inducing bubble generation.

Conclusions:

Pulsed optical forces drive unique assembling, ejection, and bubbling dynamics in nanoparticles.
These dynamics are governed by single assembly formation at asymmetric positions within the optical potential.
The observed phenomena represent a novel platform for developing advanced material fabrication techniques.