Arrangement of Equivalent Thin Metal Film to Have Narrow Attenuated Total Reflection Curve

摘要

In this study, we analyze the attenuated total reflection spectra by interpreting two virtual modes in a Kretschmann configuration. Provided that the reflectance minimum remains zero, the damping of the surface plasmon can be modulated to yield a narrower attenuated total reflection (ATR) spectrum. A multilayered structure is designed between a prism and a metal film. An equivalent metal film with a high index of extinction to index of refraction ratio yields ATR angular and wavelength spectra that are narrower than the spectra obtained from a single metal film.