Figure 1: Construction of a topological designer surface plasmon structure.
From: Probing topological protection using a designer surface plasmon structure
(a) Photo of metallic rods with diameter 2.5 mm and height 5.0 mm distributed with center–center distance 5.0 mm on a flat metallic surface. A lattice ring formed by 56 metallic rods is with radius R1=44.56 mm. A coupling ring formed by 48 metallic rods is with radius R2=38.2 mm. The ring–ring distance is g=5.0 mm. φ denotes the phase delay of electromagnetic waves along a quarter of a lattice ring. (b) Schematic of a 5 × 5 lattice in experiment. A network analyser records the field pattern by scanning a near-field probe above the metallic rods. The red meandering curve above the structure represents edge states.
