将波导模式下的光子格林函数与分子的量子光学形式结合,理论分析和计算了槽型波导耦合结构中单分子及多分子的拉曼增强因子。以平均增强因子、珀赛尔因子、波导收集百分数为主要性能参数,对独立槽型波导和复合型槽型波导的差异进行对比。结果表明,复合型槽型波导能获得显著更高的拉曼增强因子(相对于槽型波导提高了2~3个数量级),这主要是电场、珀塞尔因子、光物质相互作用体积和拉曼信号收集效率共同增加的结果。

The Raman enhancement factors of single molecule and multiple molecules in slot-waveguide coupling structure are analyzed and calculated theoretically by photon Green’s function in waveguide modes combined with the quantum optical form of molecules. The average enhancement factor, the Purcell factor and the percentage of waveguide collection are used as the main performance parameters to compare the difference between the independent slot-waveguide and the composite slot-waveguide. The results show that the composite slot-waveguide achieves a considerably higher Raman enhancement factor (two to three orders of magnitude higher than that of the slot-waveguide), which is mainly because of the combined increase of the electric field, the Purcell factor, the light-matter interaction volume, and the Raman signal collection efficiency.