Low coherence digital holography microscopy based on the Lorenz-Mie scattering model.

Area of Science:

• Optical microscopy
• Holography
• Nanotechnology

Background:

• Standard microscopy often lacks resolution for precise particle analysis.
• Low spatial and temporal coherence microscopy offers potential for enhanced measurements.
• The Lorenz-Mie model is crucial for light scattering analysis.

Purpose of the Study:

• To demonstrate low spatial and temporal coherence holography microscopy.
• To develop an optical model accounting for light source characteristics.
• To validate the model's performance in measuring particle properties.

Main Methods:

• Utilizing a standard tungsten-halogen lamp in an inverted microscope.
• Implementing holography microscopy with low spatial and temporal coherence.
• Developing an optical model incorporating spectral width and incidence angles.

Main Results:

• Validated the optical model using polystyrene microspheres (899 nm diameter) in glycerol.
• Achieved a 0.4% resolution for the refractive index of the particles.
• Achieved a 2.2% resolution for the diameter of the particles.

Conclusions:

• Low coherence holography microscopy is effective for precise particle characterization.
• The developed optical model accurately predicts particle properties.
• This technique offers a viable method for high-resolution microscopy measurements.