Silver nanoparticles wavelength-dependent excitation enhancement

In this work we employed near-field scanning optical microscopy (NSOM) to study spatially resolved optical properties of a monolayer of silver nanoparticles and their effect on the fluorescence signal of Rh6G dye and fluorescently labeled polyelectrolyte PAH-F1TC. Results of this work indicate that up to 30 times fluorescence enhancement can be achieved in small clusters with average lateral dimension between 100 and 150 nm depending on the excitation wavelength. 

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