Localized Surface Plasmon Polaritons In Ag/sio_2/ag Plasmonic Thermal Emitter

摘要

The reflection dispersion relation and emission spectra of Ag/SiO_2/ Ag trilayer plasmonic thermal emitters with different lattice constant and Ag line width were investigated. The top Ag film is perforated with parallel line-shape hole array. The induced Ag/SiO_2 surface plasmons at both top and bottom Ag/SiO_2 interface are found coupled together. The coupling effect results in the localized surface plasmon polaritons confined at the top Ag/SiO_2 interface which exhibit the Fabry-Perot resonance. The thermal emission peak position coincides with the reflection minimum in the dispersion relation and shifts to long wavelength as the Ag line width increases, which proves that the emission is due to the excitation of localized surface plasmon polaritons. Moreover, the emitted light is polarized perpendicular to the parallel metal lines.