Stochastic subwavelength structures on poly(methyl methacrylate) surfaces for antireflection generated by plasma treatment.
Subwavelength structures of sufficient height-to-width aspect ratio are adequate for reduction of the Fresnel reflection of surfaces. In the case of low-pressure plasma-treated polymers, the self-organized features are stochastically distributed on the surface area with unequal shapes. Common descriptions use effective medium theory along with a continuously altering volume filling factor that together lead to a lateral homogeneous layer with a depth-dependent refractive index. We use a fixed gradient function for the refractive index for reverse engineering of in situ measured broadband optical data, and we compare the results with nonoptic methods.
Leitel
Robert
R
Friedrich-Schiller-University, Institute of Applied Physics, Max-Wien-Platz 1, 07743 Jena, Germany. robert.leitel@iof.fraunhofer.de
Schulz
Ulrike
U
Kaiser
Norbert
N
Tünnermann
Andreas
A