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为了提高介质加载表面等离子体的传输距离,提出了基于双层介质加载的表面等离子体波导结构。利用有限元方法研究了介质加载的表面等离子体波导的模场分布及传输特性,并对其传感应用的波导灵敏度进行了分析。研究表明,当低折射率介质厚度占波导总厚度的33%时,传输距离是单层介质加载表面等离子体波导的2.4倍。利用该波导结构组成的微环谐振腔被用于生物传感研究,其传感特性分析表明,传感灵敏度为411 nm/RIU,检测极限为1.2×10~(-5) RIU。双层混合介质加载表面等离子体波导的设计和研究为其进行无标记生物传感应用提供了有价值的指导。
In order to increase the transmission distance of surface plasmon with medium loading, a surface plasmon waveguide structure based on double layer medium loading is proposed. The mode field distribution and transmission characteristics of the surface-plasmon waveguides loaded by the media were studied by finite element method. The waveguiding sensitivities of the waveguides used for the sensing were also analyzed. The results show that when the thickness of the low refractive index medium accounts for 33% of the total thickness of the waveguide, the transmission distance is 2.4 times higher than that of a single layer dielectric loaded surface plasmon waveguide. The microring resonator made up of this waveguide structure is used for biosensor research. Sensing analysis shows that the sensitivity is 411 nm / RIU and the detection limit is 1.2 × 10 -5 RIU. The design and study of double-layer mixed dielectric loaded surface plasmon waveguides provide valuable guidance for the application of label-free biosensing.