Nitrogen-vacancy (NV) centers in diamond are of great interest and promise in solid-state quantum emitters, however, the possibility of coupling NV centers with photonic or broadband plasmonic nanostructures for ultrasensitive biolabeling has not yet been fully realized . Indeed, fabrication of free-standing hybrid diamond imaging nanoprobes with enhanced brightness and high temporal resolution properties remains challenging. Therefore, there is an urgent need to develop an efficient and general strategy for efficient coupling of nanodiamond NV centers to plasmons.
Recently, Nano Letters ("Nano Letters") published online the research progress of the Liang Le research group of the Institute for Advanced Study of Wuhan University and the Ishan Barman research group of Johns Hopkins University on the research progress of nanodevices for efficiently constructing plasma-enhanced NV color centers. They used the following The upward DNA self-assembly method has developed a hybrid free-standing plasmonic nanodiamond. By constructing a closed plasmonic nanocavity, the complete subassembly of a single nanodiamond can be achieved with extremely high efficiency, thereby significantly accelerating the formation of the NV center of the nanodiamond. Transition rates, associated single-nanoparticle spectroscopic characterizations reveal significantly enhanced brightness and emission rates of plasmonic nanodiamonds. Taking advantage of the versatility of DNA self-assembly, we achieved the creation of nanoassemblies with multiple variants of nanodiamond and gold nanoparticle combinations of different sizes. Through a systematic study of the structure and properties, a causal relationship between the transition dynamics and the plasmonic nanocavity was found, and the closed plasmonic nanocavity was demonstrated to be superior to the open or semi-open nanocavity.