Spoof surface plasmons on ultrathin corrugated metal structures in microwave and terahertz frequencies

Structured metal surfaces can support spoof surface plasmons (SPs) in the microwave and terahertz frequencies, opening up a new road to manipulate the surface electromagnetic waves in subwavelength scales. The strong field confinements and fantastic plasmonic effects have motivated a vast range of studies and applications. However, the existing spoof SP structures are difficult to be integrated due to the nonplanar features. In this presentation we will review our recent work on the spoof SPs on ultrathin textured metallic surfaces, including the printed planar surface plasmon polaritons (SPPs) and conformal SPPs propagating on ultrathin corrugated metallic strips, and the spoof multipolar localized SPs on ultrathin textured metallic disks. We show that the proposed designs are versatile and flexible to route and localize SPs by numerical simulations and experiments. Hence the proposed ultrathin textured metallic structures have potential applications in building plasmonic components and sensors in the microwave and terahertz frequencies.