The delivery of optical signals from an external light source to a nanoscale waveguide is highly important for the development of nanophotonic circuits. However, the efficient coupling of external light energy into nanophotonic components is difficult and still remains a challenge. Herein, we use an external silica nanofiber to light up an organic-inorganic hybrid nano-waveguide, namely a system composed of a polymer filament doped with MoS$_{2}$ quantum dots. Nanofiber-excited nano-waveguides in a crossed geometry are found to asymmetrically couple excitation signals along two opposite directions, with different energy dissipation resulting in different colors of the light emitted by MoS$_{2}$ quantum dots and collected from the waveguide terminals. Interestingly, rainbow-like light in the hybrid waveguide is achieved by three-in-one mixing of red, green, and blue components. This hetero-dimensional system of dots-in-waveguide represents a significant advance towards all-optical routing and full-color display in integrated nanophotonic devices.

中文翻译：

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用于路由和着色的混合波导中的能量耗散和不对称激发

将光信号从外部光源传输到纳米级波导对于纳米光子电路的开发非常重要。然而，将外部光能有效耦合到纳米光子组件中是困难的，并且仍然是一个挑战。在这里，我们使用外部二氧化硅纳米纤维来点亮有机-无机混合纳米波导，即由掺杂 MoS$_{2}$ 量子点的聚合物细丝组成的系统。发现交叉几何形状的纳米纤维激发纳米波导沿两个相反方向不对称地耦合激发信号，不同的能量耗散导致 MoS$_{2}$ 量子点发射并从波导终端收集的不同颜色的光. 有趣的是，混合波导中的彩虹状光是通过红色、绿色和蓝色分量的三合一混合实现的。这种波导中点的异维系统代表了向集成纳米光子器件中的全光路由和全彩显示迈进的一大步。