Wireless Links via Coupled Topological Edge States

Topological phases of matter, despite their abstract origins, have led to a plethora of promising applications from waveguiding over lasing to antennas and beyond. Here, we show that in a diatomic chain of electromagnetic resonators that is host to topological edge states, wireless links may be established by coupling these. They significantly outperform the conventional, monoatomic chains when it comes to signal power and offer robustness against perturbations due to topological protection. These results may be of use in applications where signal power is of concern, such as underground or underwater links.