Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Nanostructures at surfaces: Dots, particles, clusters II (SPM)
O 26.2: Vortrag
Dienstag, 24. März 2009, 15:15–15:30, SCH A215
Fluorescence Enhancement by Increase of Spontaneous Emission Rate between Two Metal Nanoparticles — •Phillip Olk1, Thomas Härtling1, Marc Tobias Wenzel1, Petra Mela2, Martin Möller2, and Lukas M. Eng1 — 1Institut für angewandte Photophysik, TU Dresden, 01062 Dresden — 2DWI an der RWTH Aachen e.V., 52056 Aachen
Small metal nanoparticles are known to be suitable for nano-optical experiments due to the enhanced electric fields in their very vicinity. We show here that coupling of very small gold particles of 12 nm in diameter to a 80 nm particle attached to a scanning fibre probe affects the fluorescence signal of a surrounding fluorescent immersion medium dramatically.
By comparison of our experimental result to calculations based on the multiple multipole method we exclude multiple causes for the increased fluorescence signal: locally enhanced fields of the excitation light, re-orientation of the fluorescent dipoles, enhanced scattering efficiencies, or an increase of the metal’s auto-fluorescence can be ruled out. Instead, we ascribe the increased fluorescence signal to an influence of the nanoparticles on the emission behaviour of the dye.