Dual-Channel Surface Waves Directional Radiation with Customizable Intensity and Switchable Pattern

Achievingthe conversion from surface waves (SWs) to propagatingwaves has captivated long-standing interest, and various ingeniousmetasurfaces benefiting from the powerful control capability for electromagneticwaves are able to realize efficient SWs directional radiation. Nevertheless,most existing schemes still suffer from the bottlenecks of singleradiation channel, uncontrollable radiation intensity, and immutableradiation pattern, which immensely hinder their practical applicationin high-integration intelligent devices. Herein, a series of appealingstrategies are proposed to achieve the dual-channel SWs directionalradiation with customizable radiation intensity and switchable radiationpattern. The dual-channel SWs radiation metadevice based on the phasemodulation metasurface is designed to directionally radiate SWs inleft-handed circular polarized channel and right-handed circular polarizedchannel and possesses the broadband frequency scanning characteristic.More strikingly, the intensity-customizable dual-channel SWs radiationmetadevice loaded with lumped resistors can control the realized gainof two circular polarized radiation beams, and the pattern-switchabledual-channel SWs radiation metadevice loaded with PIN diodes can dynamicallyadjust the radiation direction of the radiation beams. Numerous simulationsand experiments of the proof-of-concept prototypes with modular designcorroborate the theoretical predictions. Our methodology shows unprecedentedflexibility in regulating SWs directional radiation and has enormouspotential in engineering applications.

Automated summary

Achieving the conversion from surface waves to propagating waves is a long-standing interest. We propose a series of strategies to achieve dual-channel surface wave (SWs) directional radiation with customizable intensity and switchable pattern. Our metadevices based on phase modulation and loaded with resistors or PIN diodes show unprecedented flexibility in regulating SWs directional radiation and have enormous potential in engineering applications.