为了进一步改善R-SPP(正反馈表面等离子体激元)在非对称波导结构中的性能, 设计了一种新型的平面型非对称波导结构。研究了入射角和波长取一定值时, 传播距离函数导致的显著振荡特性, 分析表明, 该结构在核芯厚度一定时, 能够通过改变入射角实现长距离的传播SPP模式, 且在700～1 500 nm的入射波长下能够实现5～50 μm的传播距离。通常传统的SPP的传播距离约为2 μm, 而该结构的最大传播距离可达50 μm, 这一结果对于SPP在新型光子器件中的推广应用有一定的理论和实际意义。

In order to further improve the performance of positive feedback surface plasmas (R-SPP) in the asymmetric waveguide structure, we design a new type of planar asymmetric structure of waveguide in this paper. We study the oscillation characteristics of the propagation distance function under certain value of incident angle and wavelength. The analysis shows that long-distance transmission SPP mode can be achieved by changing the angle of incidence at the certain value of the thickness of the core. It is shown that 5 to 50 μm propagation distance can be achieved under the incident wavelength of 700~1 500 nm range. It is noted that the traditional SPP propagation distance is limited to be about 2 μm. However, the design of the structure can increase the maximum transmission distance up to 50 μm. The results have certain theoretical and practical significances in the application of new photonic device based on SPP.