Reply To: Electrostatic simulations of a modulator

[Ruzan Sokhoyan]

Regarding the example you mentioned  https://optics.ansys.com/hc/en-us/articles/360042327854-PIN-Mach-Zehnder-modulator, if I run the file, the electric field distribution is symmetric. 

 

However, if I model the silicon pad under the electrodes as a dielectric with the same DC permittivity, the electric field becomes asymmetric

Why is that the case?