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Polarization effect of plasmon enhanced up-conversion in single nanocrystals coupled to silver nanowires

AuthorsPiątkowski, Dawid; Prymaczek, Aneta; Cwierzona, Maciej; Schmidt, Mikolaj K.; Nyk, Marcin; Mackowski, S.
Issue Date2017
CitationICES 2017
AbstractMetal Enhanced Fluorescence (MEF) is one of the key processes observed at the nanoscale. It has been demonstrated that coupling metallic nanoparticles to single emitters can modify the absorption and/or emission rates, improve photostability or introduce sensitivity to polarized light. Interactions that take place between single emitters and elongated metallic nanoparticles can often lead to puzzling results, in particular when polarized light is used for excitation. Including polaritons that can freely propagate in metallic nanostructure, additionally blur any sharp distinction between enhancement of absorption and emission, as well as their overall contribution to the MEF. In this work we develop a polarization-resolved Fluorescence Lifetime Imaging Microscopy (FLIM) technique for upconverting nanocrystals and demonstrate the applicability of this approach to disentangle various contributions to the overall MEF. We studied NaYF4 nanocrystals (NCs) doped with Er3+ ions, that were coupled to single silver nanowires (NWs). The sample was prepared in such a way that only one third of the length of the nanowire was covered by NCs (Fig. 1). Thereby, NCs could be excited either directly by a focused laser beam (position A) or indirectly through propagating SPPs launched on the opposite end of the NW (position B). First, we directly excited NCs coupled to the silver NW (position A). Acquired photoluminescence intensity maps show increase of the NCs emission intensity. However, only for perpendicular laser polarization (relative to the nanowire) we observed significantly shortened luminescence decay time (increased emission rate), what we attribute to the metal enhanced emission. For parallel polarization, interaction between NCs and NW is weaker, thus plasmon mediated absorption dominates the process. Indeed, parallel-polarized light can efficiently launch propagating surface plasmons (position B). Our results have been confirmed by theoretical calculations.
DescriptionResumen del trabajo presentado a la 3rd International Conference on Enhanced Spectroscopies, celebrada en Munich (Alemania) del 4 al 7 de spetiembre de 2017.
Appears in Collections:(CFMAC) Comunicaciones congresos
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