Modification of single molecule fluorescence by a scanning probe |
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Authors: | S. Kühn V. Sandoghdar |
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Affiliation: | (1) Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland |
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Abstract: | 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. PACS 33.80.-b; 07.79.Fc; 78.90.+t |
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