Reply To: Nonlinear optical material design

[Guilin Sun]

Unfortunately right now FDTD cannot simulate non-3*3 diagonal tensor nonlinear material.

for frequency dependent nonlinear material, currently only  two

Chi3 Raman Kerr

Magnetic Electric Lorentz

can be dispersive.

For permittivity, you can simulate full 3*3 tensor with matrix tranformation: Creating anisotropic optical materials in FDTD and MODE

If you want to simulate broadband, you will need to make sure that the unitary matrix does not depend on frequency.