Frequency‐Division Routing Devices Based on Spin‐Controlled Plasmonic Metamaterial

Spoof surface plasmon polariton (SSPP), a kind of surface EM wave, is able to localize EM fields of metamaterials at sub‐wavelength scale, offering an approach for achieving novel optoelectronic devices and frequency division routing technology. However, the current frequency division routing technology is difficult to independently control the propagation of the SSPP wave at multiple frequencies and limits multi‐channel applications. In this work, we demonstrate a spin‐controlled plasmonic metamaterial to realize frequency‐division routing of the SSPP wave. As two inputs, the incident spin and coding information can be exploited to independently control transmission direction and frequency‐division of SSPP waves, respectively. Furthermore, a multi‐channel surface EM wave transmission system has been constructed to send four different information to four users. Our findings provide a surface EM wave platform for multi‐channel signal communication systems.