Abstract
The theory on induced transmission in absorbing thin films1,2 made it feasible to design dielectric-metal narrow band filters based on the relationship between the optical properties and the optical surroundings of a metal layer. It has been indicated that narrow band reflection and transmission of a metal layer may be induced by a drastic change in the reflection phase shift from the matching stack attached to the emergent boundary of the metal layer3 and that the halfwidth of spectral band was inversely proportional to the phase dispersion power4. It can be seen in this paper that a simple expression for the halfwidth of phase dispersion induced transmission (PDIT) filters was a derivative of the induced transmission theory.
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