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Stochastic subwavelength structures on poly(methyl methacrylate) surfaces for antireflection generated by plasma
Robert Leitel1, Ulrike Schulz, Norbert Kaiser
1Friedrich-Schiller-University, Institute of Applied Physics, Max-Wien-Platz 1, 07743 Jena, Germany. robert.leitel@iof.fraunhofer.de
Applied Optics
|May 2, 2008
Summary
Subwavelength structures on plasma-treated polymers reduce surface reflection. This study uses optical data to model the refractive index, comparing it with other methods for anti-reflective surfaces.
Area of Science:
- Materials Science
- Optics
- Surface Science
Background:
- Subwavelength structures can reduce Fresnel reflection.
- Plasma-treated polymers form stochastic, self-organized surface features.
- Effective medium theory is commonly used to describe these structures.
Purpose of the Study:
- To model the refractive index of plasma-treated polymer surfaces.
- To investigate the effectiveness of a fixed gradient function for refractive index modeling.
- To compare optical modeling results with non-optic methods.
Main Methods:
- Utilizing in situ measured broadband optical data.
- Applying a fixed gradient function for refractive index modeling.
- Reverse engineering optical data to determine surface properties.
- Comparing results with non-optic characterization techniques.
Main Results:
- The fixed gradient function allows for effective reverse engineering of optical data.
- The refractive index profile of the subwavelength structures was determined.
- Optical modeling results were consistent with non-optic measurements.
Conclusions:
- Subwavelength structures on plasma-treated polymers effectively reduce surface reflection.
- A fixed gradient refractive index model provides a viable approach for characterizing these surfaces.
- This method offers a valuable tool for understanding and designing anti-reflective polymer surfaces.
