I simulated a Au nanodisk (D=165 nm) hex array (P=600 nm) partially embedded in dielectric slab (n=1.56). The result is overall same as my experiment, but has somewhat different in transmission as shown in the following capture. There is one extra peak at the edge of the valley at about 840nm in simulation. But no such peak happened in my experiment. Could you please help to figure out if the simulation has some setup problems that induce this peak? Many thanks!
The simulation file:nanodisk array buried in dielectric.fsp (6.0 MB)
The simulated and experimental transmissions:
The experimental transmissions: