Phys.org May 30, 2022
A team of researchers in the US (Columbia University, City University of New York, UT Austin, industry) introduced Floquet topological insulators for radio-waves with a unique design, based on the quasi-electrostatic propagation of radio signals in switched-capacitor networks. In their previous work they developed photonic topological insulators (PTI) chips that could be used to create full-duplex phased-array wireless technology, which combines two different 5G wireless capabilities: full-duplex and multi-antenna operation. PTIs do not allow the propagation of electromagnetic waves in their bulk, but they ensure efficient and robust wave propagation on their boundaries, however shaped. These unusual features are ensured by specific forms of broken symmetry that characterize the microstructure of these artificial materials…read more. TECHNICAL ARTICLE
4 × 4 dispersion-free Floquet TI using helicoidally rotating, quasi-electrostatic unit elements. Credit: Nature Electronics volume 5, pages300–309 (2022)Â