Topological Edge States in Systems of Spoof Surface Plasmon Polaritons

Abstract

Topological properties of electromagnetic waves propagating in the periodic systems have received considerable research interest recently. In photonic crystals, a class of surface states can be interpreted from the bulk-interface correspondence if a topological phase transition takes places. And these surface states may render the robust one-way transport possible in photonic systems. In this talk, we will introduce some recent works in topological interface states in 1D and 2D systems of spoof SPPs, including: 1) SSH model in the 1D system, experimental investigation of bulk-interface correspondence based on the Zak phase, and the accidental degeneracy and interface states in the hybridized plasmonic and photonic systems; 2) “valley-polarized” interface states in the 2D spoof surface plasmon systems, and the related robust one-way transport, beam splitter and Z-shape waveguides.