Remotely coupled surface plasmons in a two-colored plasmonic thermal emitter

Abstract

A two-colored plasmonic thermal emitter is fabricated with a multilayer structure, in which the dielectric layers are sandwiched between two Ag films. The top Ag film is perforated periodically with holes in a squared array. The thermal radiation of the dielectric layer resonates between two metal films, and surface plasmon polaritons are induced on the top Ag film and then converted to light radiation. Furthermore, if the single dielectric layer is replaced with double layers, then an emission peak that corresponds to the remotely coupled surface plasmon is found in the plasmonic thermal emitter, and the coupling length is less than 500nm.