Near-field optical imaging with a CdSe single nanocrystal-based active   tip
  We report near-field scanning optical imaging with an active tip made of a single fluorescent CdSe nanocrystal attached at the apex of an optical tip. Although the images are acquired only partially because of the random blinking of the semiconductor particle, our work validates the use of such tips in ultra-high spatial resolution optical microscopy. 
Y. Sonnefraud, N. Chevalier, J.-F. Motte, S. Huant, P. Reiss, J.   Bleuse, F. Chandezon, M. T. Burnett, W. Ding, S. A. Maier
physics.optics