Method for finding the optical constants of films from their reflection and transmission spectra

Kotlikov, E.N.

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Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Котликов Е.Н. Метод нахождения оптических констант пленок по спектрам отражения и пропускания // Оптический журнал. 2021. Т. 88. № 7. С. 57–64. http://doi.org/10.17586/1023-5086-2021-88-07-57-64

Kotlikov E.N. Method for finding the optical constants of films from their reflection and transmission spectra [in Russian] // Opticheskii Zhurnal. 2021. V. 88. № 7. P. 57–64. http://doi.org/10.17586/1023-5086-2021-88-07-57-64

For citation (Journal of Optical Technology):

E. N. Kotlikov, "Method for finding the optical constants of films from their reflection and transmission spectra," Journal of Optical Technology. 88(7), 391-396 (2021). https://doi.org/10.1364/JOT.88.000391

Abstract:

This paper presents an analysis of whether the optical constants of films can be determined from their transmission and reflection spectra. It is shown that such a problem cannot be unambiguously solved at separate points or on small sections of the spectrum, and ways are found to get around this difficulty. A spectrophotometric method is proposed for finding the optical constants of films, including correction of the spectra for absorption and the successive use of given sections of the spectrum. The optimum width of the sections of the spectrum is determined for finding an unambiguous solution. As an example, the given method is used to determine the optical constants of a CaY₂F₈ film in the 1.3–17 µm spectral region.

Keywords:

analysis, unambiguous solution, refractive indices, spectrophotometric method, transmission spectra, reflection spectra, correction

Acknowledgements:

The research was supported by the Ministry of science and higher education of RF, grant No. FSRF-2020-0004.

OCIS codes: 300.0300, 310.4165

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