基于银纳米线的类熊猫型微结构光纤传感器

Research of A Near-panda Micro-structured Optical Fiber Sensor Based on Silver Nanowires

设计了基于银纳米线等离子体共振效应的大孔径微流通道的类熊猫型微结构光纤传感器,采用全矢量有限元法对该传感器进行了数值研究,讨论了待测液折射率等参数对光纤传感器的损耗和灵敏度的影响。结果表明:随着待测液折射率和银纳米线直径的增大,损耗和光谱峰值λpeak都将增大;并且当银纳米线的直径增加到一定程度时,损耗和灵敏度都会呈现多峰值现象。最后取银纳米线直径d=150 nm,得到最大幅度灵敏度为910 dB/RIU,最大光谱灵敏度为1 400 nm/RIU。

A large-microfluidic-channels,near-panda micro-structured optical fiber（MOF） sensor is designed by silver nanowires localized surface plasmon resonance.Optical field distribution of the fiber at a certain wavelength is calculated and simulated using the finite element method（FEM） under the boundary condition of anisotropic perfectly matched layer（PML）.The effects of the refractive index,diameters of silver nanowires on the confined loss and the sensitivity are discussed,respectively.The results show that both the confined loss and the spectral peak wavelength increase when the refractive index of analyte increases.The confined loss,the spectral peak wavelength,the change in the spectral peak wavelength and the sensitivity increase with the diameters of silver nanowires.Furthermore,the double spectral peak wavelength will emerge when the diameters of silver nanowires increases to a certain size.At last,the maximum amplitude sensitivity 910 dB/RIU and the maximum spectral sensitivity 1 400 nm/RIU are obtained when the diameters of silver nanowires is equal to 150 nm.