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Saint Petersburg, Russia

Kotlikov E.N.,St. Petersburg State University of Aerospace Instrumentation | Ivanov V.A.,Scientific Research Institute Giricond | Tropin A.N.,Scientific Research Institute Giricond
PIERS 2010 Cambridge - Progress in Electromagnetics Research Symposium, Proceedings

At the presented work, we report the results of research of optical properties PbTe, ZnSe, ZnS, BaF2 and PbF2 thin films in a wide infrared spectral range. These materials are used for manufacturing thin film multilayer interference systems working in the mid-infrared and probably be applied in far infrared to submillimeter. Optical properties in our understanding are spectral dependences of refractive index and extinction coefficient of layers. Films with thicknesses 3-7 microns were received by thermal vacuum deposition on single-crystal silicon substrates. Refractive index and extinction coefficient dispersion in 1.5-150 microns spectral range (2-200 THz) were determined by method based on analysis of the transmission and reflection interference spectra. Films of PbTe under consideration do not possess appreciable absorption bands in the investigated spectral range. While, other investigated films have intensive absorption bands in the 25-100 microns region. With using of the investigated materials the "solar blind" filter for 1.0-50 microns spectral range on the single-crystal silicon substrate was designed and made. Source

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