Some Recent Developments in Temporal Metamaterials

Temporal metamaterials, which have constitutive parameters that vary with time, have become an area of significant research interest due to their potential to enhance light-matter interactions and create devices with unique capabilities. Here, we will review some recent developments in this exciting field, with a particular focus on short-pulsed metamaterials, which are characterized by a dielectric permittivity waveform that is much shorter in duration than the characteristic wave-dynamical timescale. We will also discuss temporal anisotropic metamaterials, which exhibit changes in their electromagnetic response over time, transitioning from isotropic to anisotropic and vice versa.