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In this study by Salvador Moreno Rodriguez, we have investigated the scattering and diffraction phenomena in metallic metamaterials that are modulated in time by means of equivalent Floquet circuits.
Specifically, we have focused on a time-periodic screen that alternates between ‘metal’ and ‘air’ states. We have advanced our research by introducing innovative concepts such as ‘macroperiod’ and ‘duty cycle’ in time modulation. This has allowed us to analyse metallic metamaterials whose modulation ratios are, in general, rational numbers. Furthermore, with the introduction of the duty cycle, we have broken the perfect time symmetry within the time modulation, which has enriched the diffraction phenomenon and provided additional degrees of freedom that can be exploited in engineering to control the reflection and transmission of electromagnetic waves.
Our study has culminated in analytical results that have been validated through FDTD. These results demonstrate that the scattering level and diffraction modes can be independently controlled through the duty cycle and modulation ratio, respectively.