I’m trying to simulate a metal-Insulator-Metal structure from J. A. Dionne, L. A. Sweatlock, and H. A. Atwater and A. Polman, “Plasmon slot waveguides: Towards chip-scale propagation with subwavelength-scale localization”, Phys.
Rev. B 73, 035407 (2006). I based the simulation on the glass-silver-air plasmon band structure example.
I used an anitsymmetric boundary condition I’m able to get the mode resonance peaks, however if i use symmetric conditions the modes do not show up. In the paper the anti symmetric modes are low loss, and the symmetric modes are very lossy so i’m guessing this is the problem. I’ve tried messing around with the simulation time, apodization, and center frequency of the source, but i cant seem to get the peaks. The mode should be evanescently decaying in the direction of the propagation through Bloch boundary conditions, would that cause problems? this is the dispersion i got which does not match the paper. There are some modes at lower freqs but i removed them from the source since they weren’t the ones i wanted either.
these are the symmetric and anitsymmetric curves from the paper
sp_film_dispersion_sym.fsp (287.0 KB)