Sorry for the long wait. I checked your simulation file and it seems like the simulation time is long enough to trigger the autoshutoff, so probably there is no early termination of the simulation. However, I noticed there was a small region where the nanorods overlap with the substrate. Is this intended? Typically, one would have the scattering object just sitting on top of the substrate. Also, the substrate is usually assumed to be much larger than the scattering object so it typically extends all the way into the PML.
For comparison with your previous results I simulated the case where the rods do not overlap with the substrate and the substrate extends all the way to the PML: nanorods_modFG.fsp (308.0 KB). The scattering cross section looks like this:
Before checking if there are any numerical artifacts in the cross section I think we should make sure the structure is correctly simulated.
Some additional changes I made to the simulation are the following:
- The mesh inside the TFSF should be uniform along the directions perpendicular to the injection direction as mentioned here.
- For simplicity I centered all the structures, the source, the simulation region, etc. at 0.
- Used antisymmetric boundary conditions along the x direction.