Transmission resonance in a composite plasmonic structure

The design, fabrication, and optical properties of a composite plasmonic structure, a two-dimensional array of split-ring resonators inserted into periodic square holes of a metal film, have been reported. A type of transmission resonance, which makes a significant difference from the conventional peaks, has been suggested both theoretically and experimentally. To understand this effect, a mechanism of ring-resonance-induced dipole emission is proposed.