Coupling between semiconductor quantum dots and two-dimensional surface plasmons

When CdSe/CdS core/shell quantum dots (QDs) are dispersed onto a two-dimensional (2D) textured Ag grating, their luminescent behavior is dramatically modified. Excited QDs can resonantly excite surface plasmon polaritons (SPPs) propagating along the modulated metallic surface. The measurements of PL spectra and time-resolved PL spectra clearly indicate the interaction between QDs and 2D SPPs. The electromagnetic interaction between QDs and the 2D corrugated metal surface makes the luminescence be enhanced, polarized, and well directed.