LAUSR

Enhancement of spontaneous emission can be achieved by the interaction between quantum emitters and the free electrons on metal surfaces, which creates additional energy relaxation channels through plasmon excitations. It can also be realized by extra near-field excitation of quantum emitters through surface plasmons created by absorption of far-field illumination. By using aluminum dimple arrays with their surface plasmon resonances (SPRs) tunable to span from the visible to UV regions, we demonstrate the control of the quantum dot (QD)-SPR coupling routes to realize either wavelength-selective enhancement of QD emission or broadband enhancement of multicolor QDs. The cost effective Al plasmonic structures enable enhancement of light emission and excitation at tailorable wavelengths and could advance the performance and design flexibility of light-emitting devices and photovoltaic technologies.