Dynamic motion analysis of optically trapped nonspherical particles with off-axis position and arbitrary orientation

Area of Science:

• Physics
• Optics
• Nanotechnology

Background:

• Optical trapping utilizes light momentum transfer to manipulate microparticles.
• Analyzing forces on nonspherical particles with arbitrary orientation is complex.
• Existing models may not fully capture dynamic behaviors in optical traps.

Purpose of the Study:

• To present a general computational method for calculating radiation pressure forces and torques.
• To enable dynamic motion analysis of nonspherical particles in optical traps.
• To validate the method against experimental results for microfabricated objects.

Main Methods:

• A ray optics model simulating optical trapping.
• Calculation of radiation pressure forces and torques.
• Time-series dynamic motion analysis for off-axis, arbitrarily oriented objects.

Main Results:

• The computational method accurately determines forces and torques.
• The model successfully performs dynamic motion analysis on complex particle shapes.
• Simulations align with experimental observations of trapping behavior.

Conclusions:

• The proposed ray optics model offers a versatile tool for optical trapping studies.
• This method can predict intricate trapping dynamics of microfabricated objects.
• The approach enhances understanding of light-particle interactions in optical tweezers.