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Journal Article

Modification of single molecule fluorescence by a scanning probe

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Kuehn, S., & Sandoghdar, V. (2006). Modification of single molecule fluorescence by a scanning probe. Applied Physics B: Lasers and Optics, 84, 211-217. doi:10.1007/s00340-006-2233-y.

Cite as: http://hdl.handle.net/21.11116/0000-0002-9B58-D
We examine the optical near-field interaction between different types of scanning tips and single oriented fluorescent molecules. We demonstrate the influence of a tip on the excitation intensity as well as on the integrated fluorescence signal, the excited state lifetime, and the angular emission of single molecules. By using a standard model describing the radiation of an oscillating dipole close to a nanosphere or a flat interface, we interpret our observations and describe some central criteria for obtaining fluorescence enhancement or quenching.