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Herein, we report sub-wavelength propagation and directional out-coupling ofwhispering gallery modes (WGMs) of a fluorescent silica microsphere resonatormediated via plasmon polaritons in a single crystalline silver nanowire.Fluorescent spectral signatures of emission from the nanowire ends confirmefficient guiding of WGMs via nanowire plasmons. By employing Fourier planeoptical microscopy, we reveal and quantify the directional fluorescenceemission of WGMs from the ends of the nanowire. Given that the discussedgeometry is self-assembled from a solution-phase, our results will findrelevance in WGM-based soft-photonic platforms including miniaturized opticalresonators and couplers.

Sub-Wavelength Plasmon Polaritons Channeling of Whispering Gallery Modes of Fluorescent Silica Microresonator