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The delivery of optical signals from an external light source to a nanoscalewaveguide is highly important for the development of nanophotonic circuits.However, the efficient coupling of external light energy into nanophotoniccomponents is difficult and still remains a challenge. Herein, we use anexternal silica nanofiber to light up an organic-inorganic hybridnano-waveguide, namely a system composed of a polymer filament doped withMoS$_{2}$ quantum dots. Nanofiber-excited nano-waveguides in a crossed geometryare found to asymmetrically couple excitation signals along two oppositedirections, with different energy dissipation resulting in different colors ofthe light emitted by MoS$_{2}$ quantum dots and collected from the waveguideterminals. Interestingly, rainbow-like light in the hybrid waveguide isachieved by three-in-one mixing of red, green, and blue components. Thishetero-dimensional system of dots-in-waveguide represents a significant advancetowards all-optical routing and full-color display in integrated nanophotonicdevices.

Energy Dissipation and Asymmetric Excitation in Hybrid Waveguides for Routing and Coloring