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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › Photonic Bandstructure Calculations › Reply To: Photonic Bandstructure Calculations

February 18, 2022 at 5:10 pm
Guilin Sun
Ansys Employee
In SI unit yes the wave vector should be 2pi/a. but in the sweep, it samples it (0~0.5)*(2pi/a) and the result only uses (0~0.5). As mentioned previously, the absolute values of the wave vectors are applied. Maybe the file should not use "k", but use n_k to represent wave vector sampling n_k*k_max where k_max=2pi/a. The sweep kx, ky actually are the normalized values.
As you can see:

FDTD applies the correct wave vector whereas "dipole_cloud" is the normalized, sampling point. Do not be confused with the symbols.