Design and fabrication of multi-layers infrared antireflection coating consisting of ZnS and Ge on ZnS substrate

作者：Moghadam R Zarei; Ahmadvand H^*; Jannesari M

来源：Infrared Physics & Technology, 2016, 75: 18-21.

DOI：10.1016/j.infrared.2015.12.028

• Multi-layers antireflection coating
• Zinc sulphide
• Germanium
• Hardness

We have designed, fabricated and characterized a multi-layers antirefiection coating on multispectral ZnS substrate, suitable for the infrared range of 8-12 mu m. The 4-layers coating (Ge/ZnS/Ge/ZnS) with optimized thicknesses was fabricated by PVD technique and studied by FTIR, nanoindentation and AFM. From FTIR spectroscopy it was found that, in the wavelength range of 8-12 mu m, the average transmittance of the double-side coated sample increases by about 26% and its maximum reaches about 98%. To improve the mechanical hardness, a bilayer of Y2O3/carbon was deposited on the coating. Nanoindentation test shows that the coating enhances the mechanical properties. The final coating have successfully passed durability and environmental tests.

• 出版日期2016-3