Abstract
We present a method to realize active optical tips for use in near-field optics that canoperate at room temperature. A metal-coated optical tip is covered with a thin polymerlayer stained with CdSe nanocrystals or nanorods at low density. The time analysis of theemission rate of the active tips and the analysis of their emission spectra reveal that a verysmall number of particles—possibly down to only one—can be made active at the tip apex.This opens the way to optics with a single inorganic nanoparticle as a light source.
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