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Proceedings Paper

Developments and IR Applications of GeC Thin Films
Author(s): A. H. Lettington; C. J. H. Wort; B. C. Monachan
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Paper 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.

Paper Details

Date Published: 1 April 1990
PDF: 8 pages
Proc. SPIE 1191, Optical Systems for Space and Defence, (1 April 1990); doi: 10.1117/12.969653
Show Author Affiliations
A. H. Lettington, Royal Signals and Radar Establishment (United Kingdom)
C. J. H. Wort, Plessey Research Caswell Ltd (United Kingdom)
B. C. Monachan, Pilkington Defence Systems (United Kingdom)


Published in SPIE Proceedings Vol. 1191:
Optical Systems for Space and Defence

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