Hi, I am trying to solve the complex form of poisson equation ∇[ε(x)∇V(x)] = -1/εo ρ(x) with complex permittivity. If I introduce complex permittivity ε = εr - j σ/(εow), then I must introduce a complex potential ,V = Vr + jVi. That means the charge density, ρ, must also take a complex form, but I'm not sure what to make of that. For my boundary conditions, I have the real part of the voltage measured from the oscilloscope, and the real charge density I compute through the conservation equations. Any help on this topic? I can't find much on this on internet. Thanks!