Exploring the role of the surface states in the luminescence of gold spherical particles by single molecule spectroscopy

Matthieu Loumaigne; Anne Débarre

doi:10.1117/12.853979

10 May 2010 Exploring the role of the surface states in the luminescence of gold spherical particles by single molecule spectroscopy

Matthieu Loumaigne, Anne Débarre

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Proceedings Volume 7712, Nanophotonics III; 77121V (2010) https://doi.org/10.1117/12.853979
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Here we report on the two-photon excited visible luminescence, emitted by small gold spheres dispersed in water. The study was performed at the single particle level in order to determine if two-photon luminescence could be an alternative to fluorescently labeled particles for particle tracking. Unexpectedly, the single molecule approach demonstrates that the luminescence is anisotropic at low excitation powers, allowing for the observation of the Brownian rotation of nearly spherical objects. The combined observations of a multi parameter approach suggest that the anisotropy, as well as the power threshold effect, result from the interaction between the capping ligands and the particle surface. The latter interaction favors new radiative deexcitation channels at some very specific sites, in line with the hot spots observed in Surface Enhanced Raman Scattering. The dynamics of the process depends on the excitation power. If the study demonstrates that an increase of the excitation power results in switching on the luminescence of nearly all particles in the sample, it also suggests that the use of two-photon excited gold particles as biolabels will require preliminary characterization of the emission depending on the real system particle and ligands.

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Matthieu Loumaigne and Anne Débarre "Exploring the role of the surface states in the luminescence of gold spherical particles by single molecule spectroscopy", Proc. SPIE 7712, Nanophotonics III, 77121V (10 May 2010); https://doi.org/10.1117/12.853979

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KEYWORDS

Particles

Gold

Luminescence

Atmospheric particles

Spherical lenses

Molecules

Diffusion

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