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Optical particle trapping with focused pseudo-Schell model beams.

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Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|March 17, 2026

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Focused Gaussian pseudo-Schell model beams trap high-refractive-index particles, while vortex Gaussian pseudo-Schell model beams trap both low- and high-refractive-index particles. These findings offer a theoretical basis for advanced particle trapping applications.

Area of Science:

Optics and Photonics
Laser Physics
Nanotechnology

Background:

Partially coherent beams are crucial in optical systems.
Understanding beam propagation and interaction with particles is essential for applications like optical trapping.

Purpose of the Study:

To derive an analytical expression for the cross-spectral density of pseudo-Schell model beams through ABCD optical systems.
To investigate the radiation forces of focused pseudo-Schell model beams on dielectric particles.
To explore the potential of these beams for optical particle trapping.

Main Methods:

Utilizing pseudo-modal expansions for partially coherent beams.
Deriving analytical expressions for cross-spectral density.
Calculating intensity distributions and radiation forces.

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Published on: January 15, 2013

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Last Updated: Mar 19, 2026

Optical Trap Loading of Dielectric Microparticles In Air

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Published on: February 5, 2017

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Comparing Gaussian pseudo-Schell model (GPSM) and vortex Gaussian pseudo-Schell model (VGPSM) beams with Gaussian Schell-model (GSM) beams.

Main Results:

Analytical results for intensity distributions show excellent agreement with numerical integration.
Focused GPSM beams stably trap high-refractive-index particles.
Focused VGPSM beams can simultaneously trap low- and high-refractive-index particles.
GPSM beams generate stronger radiation forces than GSM beams for particle trapping.

Conclusions:

The pseudo-modal expansion method simplifies the analysis of pseudo-Schell model beams.
GPSM and VGPSM beams show significant potential for effective particle trapping.
The study provides a theoretical foundation for utilizing these beams in optical manipulation.