Ansys Learning Forum Forums Discuss Simulation Photonics Weird band structure in simulation Reply To: Weird band structure in simulation

Guilin Sun
Ansys Employee

From the paper:

it seems it has end caps (in red), and their angles is not 90 deg. Make sure the structure AND the materials are exactly the same as the paper. Any difference can lead to different result.

For band structure simulations, as long as the structure, periodicity and boundary conditions are correct, and the mesh size is period/N where N is an integer, usually you will get very close result to publications. SImulation time is just to refine the result. too short or too long are not good.

Other than those points, I could not see any other causes of the large difference, in particular inside the bandgap. When there are photon states inside the bandgap, it means the periodicity is broken.

I summarized general causes here 

Ansys Insight: Why my simulation result is different from published paper or experiment?