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April 22, 2014 at 8:58 am #10784
We use Lorentz-Drude formalism to represent metals, the software comes with most useful metals already defined (gold, silver, copper etc). You can find a simple example here:
You can also characterize materials as Lorentz dispersive and Drude dispersive. For details on how these materials are modelled read the Material Models section in the OptiFDTD Technical Background.