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We recently (Optics Express 17, 19969 (2009)) introduced an all-opticalmethod for grafting onto the apex of an optical tip a single 20 nm nanodiamondwith single color-center occupancy and used the resulting single-photon tip inscanning near-field imaging at room temperature, thereby achieving a genuinescanning single-photon microscopy working in ambient conditions. A variant ofthis method is described that allows for attaching several nanodiamonds ontothe tip apex, releasing them all at once and finally recapturing them one byone by the scanning tip. This underlines the flexibility and powerfulness ofour method and its variant that could be used in applications where a fixednumber of selected optically active nano-objects requires positioning, orrepositioning, at well defined locations with nanometer accuracy.

Grafting fluorescent nanodiamonds onto optical tips