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A Protocol for Real-time 3D Single Particle Tracking
Published on: January 3, 2018
Optical tracking of single Brownian particles.
Applied Optics
|August 20, 2010
Summary
This study developed a scanning microscope to track Brownian motion of submicrometer particles in 3D. The system achieved high resolution for particle size determination and demonstrated radiation pressure effects.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Brownian motion analysis is crucial for understanding particle dynamics.
- Accurate particle sizing is essential in various scientific fields.
Purpose of the Study:
- To develop a novel random access scanning microscope for 3D particle tracking.
- To determine submicrometer colloidal particle size using Brownian motion and radiation pressure.
Main Methods:
- Utilized a random access scanning microscope system.
- Tracked Brownian motion in three dimensions with high temporal resolution (1 ms).
- Measured axial drift induced by radiation pressure for enhanced sizing.
Main Results:
- Achieved 20 nm transverse tracking resolution at 1 ms clock rates.
- Successfully determined particle diffusion coefficients and sizes from mean-square displacements.
- Demonstrated improved size resolution via radiation pressure-induced axial drift measurements.
Conclusions:
- The developed microscope system enables precise 3D tracking and characterization of submicrometer particles.
- Radiation pressure offers a sensitive method for particle size determination, particularly when combined with optical trapping.
