Dispersion of quantum dots into gases toward their optical manipulation

摘要

To realize optical manipulation and measurement for isolated quantum dots (QDs) in gaseous phase, we are developing experimental apparatus for dispersing QDs into a gas by using droplets of organic solvents. The droplet was generated with a nebulizer using a piezoelectric element and was monitored by observing the scattered light The time variation of the QD density was also monitored by observing the fluorescence from the QDs. In the case of the diethyl ether solution of CdSe/ZnS core-shell type QDs. it was confirmed that the evaporation of the droplet was enhanced with a liquid-nitrogen trap and its typical lifetime was roughly 30 s. which was considered to be determined from the descent by the force of the gravity, the evaporation, and the diffusion.