Fabry-Perot complex plasmonic eigenfrequencies for equally spaced noble-metal parallel plates

摘要

The eigenvalue condition for computing the Fabry-Perot eigenmodes of n-identical equally spaced metallic parallel plates is obtained. The frequency and decay rate of the plasmonic resonances for gold and silver are computed for quarter-wave metallic plates. I show that the system's plasmonic frequency can be tuned in silver to any desired value in the optical regime through a specific choice of the ratio of the dielectric to metal plate thickness. I also show that the eigenmodes with wave vectors having Re(v)?0 form narrow resonances.