title: Effects of the chemical bonding on the optical and mechanical properties for germanium carbide films used as antireflection and protection coating of ZnS windows.
abstract: Germanium carbide (Ge(1-x)C(x)) films have been prepared by RF reactive sputtering a pure Ge(111) target at different flow rate ratios of CH(4)/(CH(4)+Ar) in a CH(4)/Ar mixture discharge, and it has been found that the composition, chemical bonding, optical and mechanical properties of Ge(1-x)C(x) films are remarkably influenced by the flow rate ratio of CH(4)/(CH(4)+Ar). The effects of the chemical bonding on the optical and mechanical properties of the Ge(1-x)C(x) films have been explored. In addition, an antireflection Ge(1-x)C(x) double-layer coating deposited on both sides of the ZnS substrate wafer has been developed for application as an infrared window. It is shown that the transmittance in the wavelength region between 8 and 12 µm and the hardness of the ZnS substrate have been significantly improved by the double-layer coating.
authors.affiliation: Department of Materials Science and Key Laboratory of Automobile Materials of MOE, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Chaoquan
authors.initials: C
authors.lastname: Hu
authors.forename: Weitao
authors.initials: W
authors.lastname: Zheng
authors.forename: Hongwei
authors.initials: H
authors.lastname: Tian
authors.forename: Le
authors.initials: L
authors.lastname: Xu
authors.forename: Qing
authors.initials: Q
authors.lastname: Jiang