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Ansys Learning Forum Forums Discuss Simulation Photonics Bandstructure disagreement, FDTD vs MPB Reply To: Bandstructure disagreement, FDTD vs MPB

Guilin Sun
Ansys Employee

You may need to check the simulation time you used in the high-index simulation. If the simulation time is too short, it cannot capture the resonance; if it is too long, only high-Q resonance is captured so there are missing points on the bands.

You may need to limit the frequency max since much higher bands usually are not interested.