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Proceedings Paper

New sputtering concept for optical precision coatings
Author(s): Daniel Rademacher; Günter Bräuer; Michael Vergöhl; Benjamin Fritz; Tobias Zickenrott
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Paper Abstract

The deposition of optical precision coatings on glass by magnetron sputtering is still a challenging problem regarding particle density and long term stability of coating plants due to target material erosion. A novel approach to increase process stability and reduce drifts is the usage of cylindrical cathodes. These cathodes allow a particle free deposition process as they have virtually no redeposition zones that can lead to destruction of coatings by arcing caused by surface charges. In the present paper optical single layers as well as multilayer coatings were sputtered by means of reactive magnetron sputtering using a double cylindrical cathode setup. The particle density is determined and compared to particles produced with planar magnetrons. A new sputter coater concept will be presented wherein the magnetrons are attached to a rotating disc coater in a sputter-up configuration. The process was stabilized by means of oxygen partial pressure control. Preliminary optical properties as well as deposition rates of different oxide films will be presented.

Paper Details

Date Published: 3 October 2011
PDF: 7 pages
Proc. SPIE 8168, Advances in Optical Thin Films IV, 81680O (3 October 2011); doi: 10.1117/12.896843
Show Author Affiliations
Daniel Rademacher, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)
Günter Bräuer, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)
Michael Vergöhl, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)
Benjamin Fritz, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)
Tobias Zickenrott, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)


Published in SPIE Proceedings Vol. 8168:
Advances in Optical Thin Films IV
Michel Lequime; H. Angus Macleod; Detlev Ristau, Editor(s)

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