It is shown that the performance of metal–dielectric interference filters of the Fabry–Perot and Spacerless Induced Transmission types in parallel radiation incident obliquely can be described in terms of that of a single equivalent dielectric layer of refractive index μE. Expressions for μE are deduced in terms of the optical constants of the layer materials, and their validity is established by the satisfactory agreement that is shown to exist between experimental and calculated values of μE.
© 1967 Optical Society of America
Original Manuscript: August 8, 1966
Published: March 1, 1967
D. J. Hemingway and P. H. Lissberger, "Effective Refractive Indices of Metal–Dielectric Interference Filters," Appl. Opt. 6, 471-476 (1967)