Developments and IR Applications of GeC Thin Films

A. H. Lettington; C. J. H. Wort; B. C. Monachan

doi:10.1117/12.969653

1 April 1990 Developments and IR Applications of GeC Thin Films

A. H. Lettington, C. J. H. Wort, B. C. Monachan

Proceedings Volume 1191, Optical Systems for Space and Defence; (1990) https://doi.org/10.1117/12.969653
Event: SIRA/Optical Systems for Space and Defence, 1989, London, United Kingdom

Abstract

Layers of amorphous germanium/carbon with low absorption loss and good abrasion resistance have been deposited on infrared substrates by RF plasma deposition of germanium in carbon containing atmospheres (from feedstocks of CH4, C4H10 etc). The optical properties of the layers (up to 100 μm thick) have been assessed using a FTIR spectrometer and found to be strongly dependent on deposition parameters and layer composition. Layers can show high hydrogen content and absorptions caused by C-H and Ge-H bonding, but, by suitable choice of starting materials and deposition conditions, layers free of such absorption bands can be prepared with good transmission from 3pm to 12pm. Application of this novel material to the development of high durability antireflecting coatings for zinc sulphide and germanium is discussed.

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A. H. Lettington, C. J. H. Wort, and B. C. Monachan "Developments and IR Applications of GeC Thin Films", Proc. SPIE 1191, Optical Systems for Space and Defence, (1 April 1990); https://doi.org/10.1117/12.969653

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