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The experimental setup for enhancing the coupling efficiency between colloidal CdSe/ZnS QDs and an Ag NW using an AFM metallic tip.
(a) The SEM image of a single Ag NW synthesized by chemical methods. (b) The photoluminescence spectrum of the colloidal CdSe/ZnS core/shell QDs. (c) The fluorescence image of an Ag NW with colloidal CdSe/ZnS QDs.
The calculated electric field 2E distribution from the finite-element method for an Ag NW (a) without and (b) with a metallic tip and 5 nm in the separation between the NW and the tip. The length and diameter of this Ag NW are 4 μm and 80 nm.
(a) The photoluminescence spectra from the colloidal QDs deposited on the Ag NW with (blue line) and without (red line) a metallic tip. The black spectrum is the QD emission with an Au tip but without Ag nanowire. (b) The time-resolved fluorescence decay curves from the pure colloidal QDs (black), the QDs deposited on an Ag NW (blue) without a metallic tip, and QDs deposited on a Ag NW in the presence of a metallic tip with varied separations of 25 nm (red), 15 nm (pink), and 5 nm (green).
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