Reply To: Electrostatic simulations of a modulator

[Guilin Sun]

I am not sure what kind of symmetry you expect: between two contacts? it is less likely, since the potential is gradually reduced to drive the current. Please test this example  and see if the static field is symmetric: https://optics.ansys.com/hc/en-us/articles/360042327854-PIN-Mach-Zehnder-modulator

You may check result at zero voltage and compare it with higher voltage.