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Temporal boundaries in electromagnetic materials

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Article number083032
<mark>Journal publication date</mark>19/08/2021
<mark>Journal</mark>New Journal of Physics
Number of pages12
Publication StatusPublished
<mark>Original language</mark>English


Temporally modulated optical media are important in both abstract and applied applications, such as spacetime transformation optics, relativistic laser-plasma interactions, and dynamic metamaterials. Here we investigate the behaviour of temporal boundaries, and show that traditional approaches that assume constant dielectric properties, with loss incorporated as an imaginary part, necessarily lead to unphysical solutions. Further, although physically reasonable predictions can be recovered with a narrowband approximation, we show that appropriate models should use materials with a temporal response and dispersive behaviour.