Guilin Sun
Ansys Employee

In CHARGE, metallic materials are treated as ideally perfect electric conductor. The only required material property is the work function. Please refer the metallic materials such as Ag, Au in the material database.

In Photonics simulations, metals can be real metal with permittivity (from conductivity) or refractive index. It can also be considered as perfect electric conductor PEC if you do now expect any metallic effect such as surface plasmon polariton. More information can be found here  https://optics.ansys.com/hc/en-us/articles/360034915113-Standard-optical-conductivity-material-models-in-FDTD-and-MODE