Non-linear relative permittivity in Maxwell

gsairus

Hello to everyone. I have a question regarding nonlinear relative permittivity in Maxwell. Have anyone work with such things? I wanna make the same project as this one (http://www.quickfield.com/advanced/telec3.htm) but I couldn't fine any information how one can working in Maxwell with non-linearity. I will appreciate if you could guide me or just point me where I can find an appropriate information. Thank's a lot.