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Optica Publishing Group
  • Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference
  • Technical Digest (Optica Publishing Group, 2003),
  • paper QTuD2

Resonant radiative and non-radiative coupling between a molecule and a metallic tip

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Abstract

We study numerically the radiative and non-radiative decay rates of a molecule close to the apex of a metallic tip. We show that both rates present a resonance at different frequencies which, in general, do not coincide. This behavior is explained by a general model describing the resonant behavior of the electromagnetic response of the tip. We also investigate the influence of a small defect located close to the tip apex. We show that it may substantially modify the ratio between the radiative and non-radiative contributions, and induces a frequency shift of the resonances. This may explain why experiments on single-molecule fluorescence dramatically depend on the tip quality.

© 2003 Optical Society of America

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