基于复合膜的双通道光纤表面等离子共振传感器

A Dual-channel Optical Fiber Surface Plasmon Resonance Sensor Based on Composite Membrane

摘要:

基于表面等离子共振的原理,设计了一种基于复合膜的双通道光纤表面等离子传感器。利用FDTD Solutions仿真软件分析了传感器的电场传输模式,比较了单层金属Ag膜与Ag-ITO复合膜的性能,并对比分析了单通道与双通道结构。结果表明:采用Ag-ITO与Au-TiO₂复合膜的双通道结构在灵敏度和品质因数等各项性能上要明显优于传统单层金属膜与单通道结构。设计的传感器不仅可以通过两条传感通道共振偏移范围的高区分度来解决共振波长的串扰问题,而且双通道结构中一条传感通道也可以作为参考通道为传感器提供自补偿能力。

Abstract:

Based on the principle of surface plasmon resonance (SPR), a dual-channel optical fiber surface plasmon resonance sensor based on composite membrane was designed. The simulation software of FDTD Solutions was used to simulate and analyze the electric field transmission mode of the sensor, the performance of the single-layer metal Ag film and Ag-ITO composite membrane was compared, and the structure of single channel and double channel was analyzed comparatively. The results show that the sensitivity and quality factors of the dual-channel structure with Ag-ITO and Au-TiO₂ composite membrane are obviously better than that of the traditional single-layer metal film and single-channel structure. The designed sensor can not only solve the crosstalk problem of resonance wavelength by the high differentiation of resonance drift range of the two sensor channels, but also one of the sensor channels in the dual-channel structure can be used as a reference channel to provide self-compensation capability for the sensor.