Single semiconductor quantum dots(QDs) have been considered as the promising solid-state single photon sources.To obtain bright quantum sources,the key issue is to enhance extraction efficiency of the QD emission,which is challenging since QDs normally emit isotropically in a high refractive index material.In this article,we investigate the influence of Au nanoparticles on the QD photoluminescence(PL) extraction efficiency based on the techniques of optically positioned QDs and single QD emission detection....