Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 27: Trends in Ion Beam Technology: From the Fundamentals to the Application

DS 27.1: Hauptvortrag

Donnerstag, 28. Februar 2008, 14:30–15:00, H 2013

Surface engineering with ion beams: from self-organzied nanostructures to ultra-smooth surfaces — •Frank Frost, Bashkim Ziberi, Axel Schindler, and Bernd Rauschenbach — Leibniz-Institut für Oberflächenmodifizierung e. V.

Low-energy ion beam sputtering, i. e. the removal of atoms from a surface due to the impact of energetic ions or atoms, is an inherent part of numerous surface processing techniques. Besides the actual removal of material, this surface erosion process often results in a pronounced alteration of the surface topography. Due to different roughening and smoothing mechanisms a multitude of topographies can result from surface erosion. Under certain conditions, sputtering results in the formation of well ordered patterns. This self-organized pattern formation is related to a surface instability between curvature dependent sputtering that roughens the surface and smoothing by different surface relaxation mechanisms. If the evolution of surface topography is dominated by relaxation mechanisms surface smoothing can occur.

In this presentation the current status of self-organized pattern formation and surface smoothing by low-energy ion beam erosion is summarized. In detail it will be shown that a multitude of patterns as well as ultra smooth surfaces can develop, particularly on Si surfaces. Additionally the most important experimental parameters that control these processes and theoretical approaches describing the surface topography evolution are discussed. Finally, examples are given for the application of low-energy ion beams as a novel approach for passive optical device engineering for many advanced optical applications.