拉锥光纤表面等离激元共振高性能传感器

High-performance Surface Plasmon Resonance Sensors Based on Tapered Optical Fibers

Au和Ag常用于激发表面等离激元共振(SPR)。Ag的欧姆损耗低于Au,损耗谱线更窄,但Ag容易被氧化。而TiO_(2)具有化学稳定性和可调性等优势。因此,为了做出性能优异且稳定的传感器,提出了一种基于Ag/TiO_(2)的拉锥多模光纤(MMF)表面等离激元共振传感器。TiO_(2)增加传感器灵敏度保留了窄损耗谱线的优势,同时起到了保护Ag免受氧化的作用。该传感器具有高灵敏度和高质量指数(FOM)的特点,在通信波长范围内表现出卓越性能。为了深入研究,文中使用基于COMSOL Multiphysics软件的有限元方法(FEM)模拟工具进行了数值研究。模拟结果显示:传感器实现了最大波长灵敏度达到16000 nm/RIU,最大FOM值为1920 RIU^(-1)。该研究为高性能SPR传感器的设计提供了有价值的设计见解。

Au and Ag are commonly employed for exciting surface plasmon resonance(SPR).Ag exhibits lower Ohmic losses than Au,resulting in narrower loss spectra.However,Ag is prone to oxidation.On the other hand,titanium TiO_(2) offers advantages such as chemical stability and tunability.Therefore,to develop a high-performance and stable sensor,a tapered multimode optical fiber(MMF)SPR sensor based on Ag/TiO_(2) was proposed.TiO_(2) enhanced sensor sensitivity and preserved the advantage of a narrow loss spectrum,while also protecting Ag from oxidation.The sensor demonstrated high sensitivity and a high figure of merit(FOM),exhibiting outstanding performance within the communication wavelength range.For in-depth investigation,numerical studies were conducted using the finite element method(FEM)simulation tool based on COMSOL Multiphysics software.Simulation results indicate that the sensor achieves a maximum wavelength sensitivity of 16000 nm/RIU,with a maximum FOM value of 1920 RIU^(-1).This research provides valuable design insights and for the development of high-performance SPR sensors.