Subject of study. A methodology is developed to design beam splitters for polarized radiation based on optical thin films that provide independent reflection and transmission coefficients for different polarizations of incident optical radiation. Aim of study. A design methodology for beam splitters for polarized radiation is developed using the FilmAnalysis software package. Method. The problem of designing multilayer thin-film coatings is formulated using an evaluation function with constraints. Numerical iterative methods of multiparameter optimization are applied to synthesize multilayer thin-film coating structures for beam splitters. Main results. A design methodology for beam splitters for polarized radiation in the far-infrared spectral region of 7–14 µm is proposed and described. The structures of the designed beam splitters for infrared radiation are presented. For the operating wavelength of a CO 2 laser (10.6 µm), beam splitter structures are obtained, and the difference in the reflection and transmission between S - and P -polarizations is analyzed. Practical significance. The obtained results can be utilized to develop optical and optoelectronic devices for modern applications, including polarization thermal imaging, polarization Fourier interferometry, and optical paths of laser radiation.
Kotlikov et al. (2025) studied this question.