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Precise thickness and refractive index determination of polyimide films using attenuated total reflection
Applied Optics
|October 22, 2010
Summary
This study introduces a reflectivity method to measure polyimide thickness and refractive index. The technique precisely determines polymer properties for waveguide performance analysis.
Area of Science:
- Materials Science
- Optics
- Polymer Science
Background:
- Surface plasmons and guided modes influence light reflectivity at interfaces.
- Accurate measurement of polymer optical properties is crucial for device performance.
Purpose of the Study:
- To develop a precise method for measuring polyimide thickness and optical constants.
- To evaluate the performance of low-loss polymer waveguides.
Main Methods:
- Utilizing reflectivity dips caused by surface plasmons and guided modes.
- Analyzing experimental reflectivity data to extract optical constants (refractive index).
Main Results:
- Achieved 1% precision in polyimide thickness measurement (0.5-10 µm range).
- Obtained ~10% precision for the imaginary part of the polymer refractive index.
- Demonstrated a viable technique for assessing polymer waveguide performance.
Conclusions:
- Reflectivity analysis is an effective method for characterizing thin polymer films.
- The technique provides valuable insights into polymer optical properties and waveguide efficiency.
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