Ellipsometry of light scattering from multilayer coatings

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Ellipsometry is a powerful technique for characterizing thin films.
• Scattering phenomena in optical materials can be complex and difficult to model.

Purpose of the Study:

• To extend scatterometer capabilities for comprehensive ellipsometric analysis of scattered light.
• To investigate unexpected experimental results from thin-film layers and optical coatings.

Main Methods:

• Development of an extended scatterometer for multi-directional ellipsometric measurements.
• Application of electromagnetic theories for surface and bulk scattering analysis.
• Investigation of partial correlation and localized defects.

Main Results:

• Experimental data from single thin-film layers and optical coatings yielded unexpected outcomes.
• The study revealed the significant influence of partial correlation on scattering.
• Localized defects were identified as key contributors to observed scattering phenomena.

Conclusions:

• The extended scatterometer provides new insights into light scattering.
• Electromagnetic theories effectively explain the observed unexpected results.
• Understanding partial correlation and defects is crucial for accurate optical material characterization.