The absorption loss in a multilayer interference filter or antireflection coating can be calculated from the optical properties of its constituent materials. In the design of such a filter, the absorption and scattering losses are usually neglected. Even if these losses were taken into consideration at the design stage, the resulting performance would probably not be greatly improved; however, it is of interest to predict the change in filter performance when absorbing materials are substituted in an ideal nonabsorbing filter.
The multilayers treated include transmission-type interference filters, both with and without semi-transparent metal films, reflection-type interference filters, and antireflection coatings.
The analysis is made by transmission-line methods. The connection between optical and electrical filters with absorption losses is further treated in an appendix.
LEO YOUNG, "Prediction of Absorption Loss in Multilayer Interference Filters," J. Opt. Soc. Am. 52, 753-760 (1962)