The optical performance of an ideal thin film can be represented by a single point on a triangular coordinate graph, because the sum of the reflectance, transmittance, and absorption is unity. Several examples are presented to show how the triangular coordinate graph provides a useful perspective to the interplay between the performance and the optical properties of a semitransparent metal film.
© 1990 Optical Society of America
Joseph H. Apfel, "Triangular coordinate graphical presentation of the optical performance of a semitransparent metal film," Appl. Opt. 29, 4272-4275 (1990)