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Combined reflection and transmission thin-film ellipsometry: a unified linear analysis
Applied Optics
|February 16, 2010
Summary
This study introduces a combined reflection and transmission ellipsometry method for analyzing thin films. External reflection ellipsometry proves highly sensitive for detecting ultrathin interfacial films, even at the sub-angstrom level.
Area of Science:
- Optical physics
- Surface science
- Materials characterization
Background:
- Ellipsometry is a powerful technique for characterizing thin films.
- Understanding the sensitivity of different ellipsometric configurations is crucial for accurate analysis.
Purpose of the Study:
- To propose and investigate a combined reflection and transmission ellipsometry scheme.
- To comparatively study the sensitivity of external, internal reflection, and transmission ellipsometry.
- To develop unified linear approximations for analyzing ellipsometric data.
Main Methods:
- Development of a combined reflection and transmission ellipsometry scheme.
- Investigation of sample design and instrument operation.
- Comparative sensitivity analysis using unified linear approximations.
- Introduction of a complex sensitivity function to determine Psi and Delta sensitivity factors.
Main Results:
- External reflection ellipsometry near the Brewster angle is highly sensitive to ultrathin interfacial films (e.g., 10⁻⁵ Å gold).
- Nonabsorbing films at interfaces are not detectable by first-order changes in Psi using reflection or transmission ellipsometry.
- Transmission ellipsometry sensitivity increases monotonically with the angle of incidence.
- Snell's law relates external and internal incidence angles yielding identical sensitivity functions.
- Linear approximations are valid over comparable ranges for reflection and transmission ellipsometry, with potential nonlinearity in total internal reflection ellipsometry.
Conclusions:
- Combined ellipsometry offers a versatile approach for thin film analysis.
- External reflection ellipsometry is optimal for detecting extremely thin interfacial films.
- Transmission ellipsometry's sensitivity is angle-dependent, increasing with incidence angle.
- Understanding the interplay between reflection and transmission modes, governed by Snell's law, is key.
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