目前SPP(表面等离子激元)技术应用面临的主要困难依然是SPP传播中的高损耗问题, SPP波导亚波长约束与传播距离的矛盾和SPP传播中的强烈衰减是当前表面等离子研究的关键问题。文章采用非对称介质波导结构设计了一种加载玻璃的SPP传播优化器件, 应用的SPP激发模型与Kretschmann结构类似, 实现了无需牺牲波导亚波长尺寸来提高SPP传播距离。FDTD(有限差分时域)方法分析结果表明: 改进的波导结构能够显著增加SPP传播距离, 提高电场强度, SPP传播距离提高了近20倍。对比不同厚度的薄膜层可以看出, 薄膜最薄时, 局域化效果最好；改进的结构显著增加了SPP耦合效果。这种加载玻璃的SPP传播优化器件为SPP在新型光子器件、宽带通信系统、微小光子回路和光电子集成等方面的应用提供了关键器件。

The application of Surface Plasmon Polariton (SPP) suffers from high loss during propagation and contradiction between subwavelength constraints and propagation distance. The paper proposes an asymmetric dielectric waveguide structure and designsa loaded glass SPP propagate optimization device.The excited model of SPP is similar to Kretschmann structure. It can improve the propagation distance without sacrificing the size of subwavelength waveguide. The Finite Difference Time Domain(FDTD)analysis results show that the improved waveguide structure can significantly increase the SPP propagation distance with higher electric field strength. The SPP propagation distance is increased by more than 20 times. We also compare the performances with different thickness of film layers. The result indicates that the better localization performance can be achieved with thinner film.The proposed structure also significantly increases the SPP coupling effect. The proposed structure has the potential for the application of SPP in the area of new photonic devices, broadband communications systems, small photon loops, and other aspects of integrated optoelectronic applications.