Nonreciprocal signal growth in space-time modulated transmission lines

Funding Sponsor

Purdue University

Author's Department

Electronics & Communications Engineering Department

Third Author's Department

Electronics & Communications Engineering Department

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https://doi.org/10.1038/s41598-025-03006-7

All Authors

Mohamed F. Hagag Thomas R. Jones Karim Seddik Dimitrios Peroulis

Document Type

Research Article

Publication Title

Scientific Reports

Publication Date

12-1-2025

doi

10.1038/s41598-025-03006-7

Abstract

Nonreciprocity in space-time modulated photonic crystals has been explored in the context of nonreciprocal propagation and polarization. In this study, we investigate reconfigurable nonreciprocal wave growth in space-time modulated crystals. By imposing an adaptable progressive phase shift between successive time-modulated cells, we induce blue and red shifts in the forward and backward momentum band gaps around the typical normalized growth frequency of 0.5. This spatiotemporal scheme is applied to engineer the dispersion relation of a loaded transmission line−a 1D periodic structure−in the microwave regime. The nonreciprocal wave growth is studied and analyzed under conditions that either allow or forbid backward propagation.

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