Abstract
Single quantum systems are fascinating objects, either for fundamental studies or as well defined local probes in future nanoscopic devices. The method we developed to observe single molecules consists in addressing them with a single frequency laser in a micron-size sample kept at liquid helium temperature. Fluorescence excitation spectra of such a sample show the sharp resonance lines of single molecules, which can then be used in several spectroscopic experiments [1,2]. In the present paper, we review recent nonlinear optical experiments on single molecules.
© 1996 Optical Society of America
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