Developments And IR Applications Of GeC Thin Films

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

doi:10.1117/12.960774

11 September 1989 Developments And IR Applications Of GeC Thin Films

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

Proceedings Volume 1112, Window and Dome Technologies and Materials; (1989) https://doi.org/10.1117/12.960774
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

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 3μm to 12μm. 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 1112, Window and Dome Technologies and Materials, (11 September 1989); https://doi.org/10.1117/12.960774

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