Temporal interfaces and metamaterial response enabled by boundaries
- Luca Stefanini ,
- Davide Ramaccia ,
- Filiberto Bilotti ,
- Alessandro Toscano
Abstract
In the last years, temporal metamaterials have been exploited as a novel
platform for conceiving several electromagnetic and optical devices
based on the anomalous scattering response achieved at a single or
multiple sudden change of their medium properties, which however is
difficult to carry out in a realistic scenario In this letter we
investigate on the possibility to emulate the scattering response of a
temporal metamaterial without acting on the medium properties, but on
the effective refractive index and wave impedance perceived by the wave
during the propagation within a guiding structure rather than the actual
material, by acting on its boundaries. The work presents in closed form
the scattering coefficients achieved when the boundary properties are
suddenly modified for inducing an effective temporal interface. In this
framework, temporally controlled metasurfaces can be used to implement
the proposed concept, giving an easier path also to the design and
realization of novel devices at microwave and optical frequencies.