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Updated: Jun 22, 2026
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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
Published on: February 8, 2014
Characterizing and tracking single colloidal particles with video holographic microscopy.
Sang-Hyuk Lee1, Yohai Roichman, Gi-Ra Yi
1Department of Physics and Center for Soft Matter Research, New York University, New York, NY 10003, USA.
Optics Express
|June 25, 2009
Summary
Digital holographic microscopy and Mie scattering theory enable precise characterization and tracking of colloidal particles. This method accurately measures particle size, refractive index, and 3D position simultaneously.
Area of Science:
- Colloidal science
- Optical microscopy
- Particle characterization
Background:
- Accurate characterization of colloidal particles is crucial for understanding their behavior in various applications.
- Existing methods often lack the precision or simultaneous measurement capabilities for multiple particle properties.
Purpose of the Study:
- To develop a method for simultaneous characterization and tracking of individual colloidal particles.
- To achieve high precision in measuring particle properties and their 3D positions.
Main Methods:
- Utilizing digital holographic microscopy (DHM).
- Applying Mie scattering theory for data analysis.
- Simultaneously capturing holographic snapshots of particles.
Main Results:
- Precise measurement of colloidal sphere radius and refractive index (within 1%).
- Simultaneous determination of three-dimensional particle position with nanometer in-plane precision.
- Achieved 10 nanometer axial resolution for particle tracking.
Conclusions:
- Digital holographic microscopy combined with Mie scattering offers a powerful tool for detailed colloidal particle analysis.
- This technique provides unprecedented simultaneous measurement of multiple particle parameters and their dynamic positions.
- The high precision achieved opens new avenues for research in colloidal dynamics and materials science.
