I designed a plasmonic waveguide using gold as noble metal using Comsol and the structure is asymmetric. I mean the substrate and superstrate have different materials and they are dielectrics. my main question is wahat is the exact equation to calculate the dispersion diagram of the structures that have double interface? I am confused which equation should I use to calculate the dispersion diagram of my waveguide. should I write a code to calculate it or it can be calculated directly within the Comsol?

any valuable comments will be appreciated.

Many thanks in advance.

#Comsol

#Plasmonics

#SPPs

#dispersion diagram