Learning Forum

[Jordi Lopez Leyva]

[Amrita Pati]

Hi Jordi,

I am not sure what you mean by manually. I would be interested to know how you are calculating the refractive index. For example, if you have a equation that can be used to determine the index from the field, then you can use Spatial (n,k) data - Simulation object. I can point to a few examples where we do this. But let me know how are you calculating the index.

Regards,
Amrita

[Jordi Lopez Leyva]

Hi Amrita,

I want to implement the Pockels effect in 111 GaAs. I first tried to do a permitivity rotation with chi1xx,chi1yy=10^-10, chi1zz=0. But I obtained no difference when applying the rotation. So now I'm trying to instead implement the analytical formula n1=sqrt(3/2)*r41*E. The example you have given could suffice, since I can use the average E field from a monitor to calculate n1, and then do my remaining simulation with the modified n1. However, do you know if there's an easier method for FDTD?

[Amrita Pati]

Hi Jordi,

Thanks for sharing more information! I do not think there is a simpler method. There are a couple of examples where we calculate the electric fields in CHARGE, determine the index perturbation from the field using Pockels effect, and then apply the index perturbation in FDE/FEEM to calculate the modes of a waveguide. This might be of interest to you:

1. Ferroelectric Modulator: 
   This example might look a bit compicated as the full Pockels tensor is considered. But I think it is a good source for looking at the overall methodology.
2. Thin film Lithium Niobate Electro-Optic Phase Modulator

Regards,
Amrita

[Jordi Lopez Leyva]

Thank you Amrita!, I'll look into those examples.