Learning Forum

[Jason Huang]

Hello, I would like to run FDE on a ring resonator. I have been able to set up the proper geometric structure of the ring resonator and obtain the eigenmode using FDE analysis. Now I would like to integrate some electric gates across the ring resonator, apply a certain voltage on top of the gates, and see how the previous eigenmodes from FDE would change. Any suggestions on how I could implement the user-defined gate+voltage components into FDE? Thank you!

[Amrita Pati]

Hi Jason,

I suppose you are using the FDE to calculate the modes of a bend. FDE is just used for optical simulation so, you won't be able to apply voltages. First, you can use the CHARGE solver to do the electrostatic simulation. But then, depending upon the material, you have to calculate the perturbed indices due to the applied voltage. These pertubed indices are then included in FDE to calculate the modes. For example, we have an example on Lithium Niobate waveguide, where we perform the electrostatic simulation in CHARGE. We obtain the electric field distribution for each applied voltage. Then we use Pockels formulation to calculate the perturbed indices due to electric field and import them to FEEM (FEM equivalent of FDE) to determine the eigenmodes.

Here are some examples that you might find useful:

1. Ferroelectric modulator
2. Thin Film Lithium Niobate Electro-Optic Phase Modulator

Regards,
Amrita