User:Myxomatosis57/Greymachine

Temporal metamaterial, also known as time-varying metamaterial, is a metamaterial whose dispersive properties vary with time. Unlike conventional metamaterials, whose constitutive properties are engineered through its periodically stacked constituents (spatial modulation), temporal metamaterials are formed by the temporal modulation of the such parameters, which introduces further exotic properties not found in the latter if the switching bandwidth is in the order of modulation frequency. A subclass of these materials, whose properties are modulated both in time and space, are known as space-time metamaterials.

For electromagnetic waves, temporal modulation of the canonical material properties, such as permittivity, permeability or surface impedance, can be achieved through varactor switching, magneto-optic effect or nonlinearity, among others.