Problem while modeling Silicon Nitride on FDTD with kerr effect
I want to add Silicon Nitride(Si3N4) with kerr nonlinearity in material manager. I am having n0(Linear Refractive index) and n2(Nonlinear Refractive index), but in optifdtd we require with Linear Permitivity, Response time and Permitivity. Is there any relation to calculate these values from n0 and n2. or any resource to find these values for silicon nitride.
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