Inverted SP resonance in palladium in Kretchmann configuration

The surface plasmon resonance in Kretchmann configuration showing reflectivity maxima in thin palladium films has been discovered and investigated. The resonant curve form and angular position are influenced by thin film palladium properties of which (the frequency of nonelastic electron collisions in metal (γ) and the metal electron plasma frequency (ωρ)) depend on concentration of hydrogen in ambient medium. It is shown that by increasing the γ value and decreasing the cup value the resonant curve half-width broadens. Behavior of reflected beam phase as functions of γ and cup was simulated. It is shown that inverted resonance for surface plasmons for palladium may be used for a wide class of SP-based sensors, in particular, for sensors of small hydrogen concentration.