Ray tracing matrix approach for refractive index mismatch aberrations in confocal microscopy.

Area of Science:

• Optics and Photonics
• Materials Science
• Microscopy

Background:

• Refractive index mismatch (RIM) introduces optical aberrations in microscopy.
• Accurate imaging of liquid crystal (LC) layers is crucial for various applications.
• Existing methods struggle with complex optical phenomena like non-uniform director distributions.

Purpose of the Study:

• To describe optical aberrations caused by RIM in fluorescent confocal polarization microscopy.
• To predict and experimentally validate the imaging behavior of LC layers with non-uniform director distributions.
• To extend the ray tracing matrix (RTM) method for off-axial focusing in dispersed droplets.

Main Methods:

• Utilized the 2x2 ray tracing matrix (RTM) method for optical aberration analysis.
• Developed an extended RTM method for off-axial focusing scenarios.
• Conducted experimental validation of predicted imaging behaviors.

Main Results:

• Confirmed that RIM causes LC layers with non-uniform director distribution to appear as layers with non-uniform thickness.
• Observed rear surface roughness as an indicator of non-uniform thickness.
• Successfully applied the extended RTM for off-axial focusing in droplet systems.

Conclusions:

• The RTM method effectively models optical aberrations due to RIM in advanced microscopy.
• Non-uniform director distribution in LC layers leads to observable imaging artifacts.
• The extended RTM method enhances the capability for analyzing complex optical systems.