Photophoretic Trapping: Fundamentals, Advances, and Future Directions.

Area of Science:

• Optics and Photonics
• Particle Manipulation
• Aerosol Science

Background:

• Photophoretic forces are significantly stronger than radiation pressure.
• These forces allow particle trapping at low optical intensities.
• Applications span aerosol science, 3D displays, and space deployment.

Purpose of the Study:

• To provide a comprehensive explanation of photophoretic forces.
• To detail experimental configurations for stable 3D trapping.
• To unify theoretical, experimental, and application aspects of photophoretic trapping.

Main Methods:

• Review of underlying physics of photophoretic forces.
• Examination of experimental configurations for robust trapping.
• Analysis of physical parameters governing force magnitude and behavior.

Main Results:

• Stable 3D manipulation of absorbing particles is facilitated by photophoretic forces.
• Rich dynamical phenomena are exhibited by photophoretically trapped particles.
• Current and emerging applications are discussed.

Conclusions:

• Photophoretic trapping is a rapidly developing field.
• Systematic unification of theory, experiments, and applications is crucial.
• Advancing research in photophoretic trapping is the primary aim.