This subfeature is available only when Drude-Lorentz Dispersion Model is selected as the Electric displacement field model in the Wave Equation, Electric feature node. Then the subnodes are made available from the context menu (right-click the parent node) as well as from the Physics toolbar, Attributes menu.

Each Drude-Lorentz Polarization subnode adds another polarization term Pn to the electric displacement field D, defined by

Here Γn is a damping coefficient, ωn is a resonance frequency, fn is an oscillator strength, and ωp is the plasma frequency.

Enter values or expressions for the Oscillator strength fn (SI unit: 1), the Resonance frequency ωn (SI unit: rad/s), and the Damping in time coefficient Γn (SI unit: rad/s).

Enter values or expressions for the initial values of the components of the Drude-Lorentz polarization Pn (SI unit: C/m2) and its time derivative ∂Pn/∂t (SI unit: A/m2). The default values are 0 C/m2 and 0 A/m2, respectively.

Select the element order from the list box for the Drude-Lorentz polarization Pn.