Physics News September 6, 2018
Doping SWCNTs is emerging as an effective means for enhancing the emission properties of nanotubes and introducing new functionalities. Researchers at Los Alamos National Laboratory showed that the photon pair emission originates from two successive captures and recombination of excitons at a solitary oxygen dopant state and this type of photon pair emission process can happen at an efficiency as high as 44 percent of the single photon emission. The main limiting factor for the efficiency of this process is exciton-exciton annihilation. This work opens an exciting new path toward carbon nanotube-based lasers and entangled photon generation. It could also change lasers, used in everything from consumer electronics to scientific instruments… read more. TECNICAL ARTICLE
In a carbon nanotube, the capture of a photon generates two excitons at oxygen doping site. The excitons recombine and emit photon pairs. Credit: Han Htoon, Center for Integrated Nanotechnologies. Reproduced by permission of the Royal Society of Chemistry