Some corollaries of the necessary conditions for optimal multilayer optical coating synthesis are presented. Multilayer coatings, consisting of natural absorbing materials with complex permittivities (epsilon) equals (epsilon) ' + i (DOT) (epsilon) '' are considered. The principle of optimal materials choice and order of alternation is formulated. It is shown that the optimal coating is multimaterial.
Sergey V. Grebenshikov,
"Materials for optimal multilayer coating", Proc. SPIE 1519, International Conference on Thin Film Physics and Applications, (1 November 1991); doi: 10.1117/12.47208; https://doi.org/10.1117/12.47208