We demonstrate the dependencies of energy losses and fluorescent efficiencies on doping concentrations for rhodamine B (RhB)-doped polymer microfibers (PMFs) under optical waveguiding excitation. Compared with the four doping concentration groups (2.0 mg/g, 2.4 mg/g, 2.8 mg/g, and 3.2 mg/g), the 2.4 mg/g concentration group has the largest energy loss rates (similar to 0.102 dB/mu m and similar to 0.036 dB/mu m for the excitation light and the fluorescence, respectively) and the highest fluorescence ratio at the coupling point. Further analysis demonstrates that the fluorescent emitting efficiency at the output end is approximately exponentially decaying with the propagation distance. The fluorescent emitting efficiency is also related to the doping concentration, which obtains the optimal fluorescent propagation effect at the doped PMF with a concentration of 2.8 mg/g. This work may provide a helpful reference for waveguiding circuit integration and active device design based on dye-doped micro/ nanofibers. (C) 2020 Optical Society of America
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机译：我们展示了光波导激发下的罗丹明B（RHB） - 掺杂聚合物微纤维（PMF）掺杂掺杂浓度的能量损失和荧光效率的依赖性。与四个掺杂浓度基团（2.0mg / g，2.4mg / g，2.8mg / g和3.2mg / g）相比，2.4mg / g浓度基团具有最大的能量损失率（类似于0.102 dB / mm M和类似于0.036dB / mu m的激发光和荧光，荧光的最高荧光比在耦合点处。进一步的分析表明，随着传播距离，输出端的荧光发光效率大致衰减。荧光发光效率也与掺杂浓度有关，其在掺杂PMF处获得最佳荧光传播效果，其浓度为2.8mg / g。这项工作可以基于染料掺杂的微/纳米纤维提供波导电路集成和有源器件设计的有用参考。 （c）2020美国光学学会
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