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Stochastic subwavelength structures on poly(methyl methacrylate) surfaces for antireflection generated by plasma treatment

: Leitel, R.; Schulz, U.; Kaiser, N.; Tünnermann, A.


Applied optics 47 (2008), Nr.13, S.C143-C146
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Fraunhofer IOF ()
optical coating; polymer

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.