Reply To: Weird band structure in simulation

[Guilin Sun]

Polarization matters very much, except that a structure is rotationally symmetry along all directions.

When there are states inside the bandgap, it means the perfect structure is broken, either by the structure or polarization. Once you are sure there is no any issue for the structure (please use integer number of meshes along periodic axes with override mesh), you may need to modify simulation time/autoshutoff min to only pick the band signals. If the simulation time is too short, it may pick up non-band information; if it is too long, it may lose some low-Q resonance causing missing points on the bands. This needs trial and error to find a better simulation time.

I read the caption from the published figure: it says they use spheres in a high dielectric material. However your structure is not the same.