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Static and dynamic behavior of two optically bound microparticles in a standing wave.

O Brzobohatý¹, V Karásek, M Šiler

¹Institute of Scientific Instruments of the ASCR, v.v.i., Academy of Sciences of the Czech Republic, Královopolská 147, 612 64 Brno, Czech Republic.

|October 15, 2011

Summary

Optical binding between particles, though typically weak, significantly alters behavior in optical traps. Our study demonstrates this effect in two-particle systems within a standing wave, validated by simulations.

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Area of Science:

Physics
Optics
Nanotechnology

Background:

Optical binding, the interaction between particles via scattered light, is generally considered negligible in multi-particle trapping.
This weak interaction is often disregarded in experiments involving distinct optical traps.

Purpose of the Study:

To investigate the impact of optical binding on the behavior of dielectric particles in optical traps.
To demonstrate that even two particles in a standing wave exhibit distinct dynamics compared to single particles.

Main Methods:

Utilizing a standing wave optical trap to confine dielectric particles.
Employing the coupled dipole method for theoretical simulations, including deterministic and stochastic approaches.
Conducting experimental measurements to record particle behavior.

Main Results:

Observed significantly different behavior for two dielectric particles in a standing wave compared to single trapped particles.
Achieved strong agreement between experimental data and theoretical simulation results.
Quantified the non-negligible influence of optical binding in a two-particle system.

Conclusions:

Optical binding, even between only two particles, can lead to substantial changes in particle dynamics within optical traps.
The coupled dipole method provides accurate predictions for optical binding effects.
This finding challenges the conventional neglect of optical binding in multi-particle trapping scenarios.