Abstract
We show that the plasmon modes of Ag nanowires can be imaged by coating them with a layer of quantum dots (QDs), held off the nanowire surface by a nanoscale dielectric spacer layer. Parallel or perpendicular excitation polarization modulates the intensity maps of two-photon excitation fluorescence (TPEF), which exhibit Fabry–Pérot cavity modes at the excitation or fluorescence wavelength. We attribute this phenomenon to the QDs excited by propagating surface plasmon polaritons or localized surface plasmon modes. The results of the TPEF intensity maps are well explained by theoretical simulations, and the energy transfer process is also discussed.
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