Abstract
The spontaneous emission (SE) of light sources can be modified externally by surrounding local density of optical states. Here, the SE of single colloidal CdSe/ZnS quantum dots (QDs) coupled to dielectric disks with sub-micrometer sizes was investigated. Using single-QD measurement, the radiative decay rates can be extracted based on time-tagged, time-resolved measurement. In this case, up to ∼6-fold enhancement of the SE rate was observed when single QDs were located on the disk edge. In addition, the photon statistic was found to exhibit photon anti-bunching behavior with much narrowing linewidth, indicating single-photon emission via fast radiative decay process. © 2011 American Institute of Physics.