Optical and structural properties of ZnS0.5Se0.5 films and interference filters based on them

摘要

In this study, the structural and optical properties of thin films of a ZnS(0.5)Se(0.5)solid solution, which are used to create multilayer interference coatings for operation in the near- and mid-infrared regions, are investigated. The structural features and phase composition of the initial film-forming material and films obtained by thermal evaporation in a vacuum on substrates of borosilicate glass and single crystals of germanium and silicon are studied by X-ray diffraction analysis. The dispersion dependences of the optical constants are calculated from spectrophotometric measurements of the films studied here in the spectral range of 2-25 mu m. The results of designing and manufacturing infrared interference filters using the films studied here are presented, which include a band-pass filter with transmission in the wavelength range of 8-12 mu m and a narrow-bandpass filter with maximum transmission at a wavelength of 10.56 mu m and a full width at half-maximum of 140 nm. (C) 2020 Optical Society of America