Research On PCF-SPR Sensing Characteristics Based On TiN Film And Au Nanowire

Photonic crystal fiber(PCF)is also called microstructure optical fiber or porous fiber,the transmission characteristics can be changed by changing air holes diameters or air holes spacing,hole shape.Which has been used for making various different-function device,especially PCF sensor based surface plasmon resonance is one of the most interests.PCF has attracted much attention of both home and abroad scholars in the field of optical fiber communications and optical fiber sensing for its tremendous degree of freedom in PCF design,unique physical properties and light advantages.Surface plasmon resonance(SPR)sensor technology has wide application in biological,chemical,environmental,medical and many other areas that are closely related to people's lives.This paper primarily researches on the PCF,and SPR technology combined with PCF is used for sensing.A variety of PCF sensor based on surface plasmon resonance was proposed,the full vector finite element method(FEM)is employed to analyze sensing properties in detail.The major contents are as follows:1.In this paper,the concept and properties of photonic crystal fiber and the surface plasmon resonance technology are briefly introduced.Then,the development of photonic crystal fiber sensing based on surface plasmon resonance is analyzed,and then main work arrangement and innovation of this paper are presented.2.The basic theory of photonic crystal fiber sensing based on surface plasmon resonance and the numerical calculation method of photonic crystal fiber simulation are introduced.The full vector finite element method and the simulation analysis process using COMSOL Multiphysics software are emphasized in this paper.3.A dual-core photonic crystal fiber temperature sensor based on the surface plasmon resonance of titanium nitride is proposed.The structure parameters and plasma material influence on the sensing properties is analyzed by full vector finite element method.The temperature sensitivity of the sensor is 6.22nm/K,which is in the temperature range of-19?~-1?.4.A new type of surface plasmon resonant sensor with double-core photonic crystal fiber is designed.The effective refractive index of the core of the sensor at different wavelengths is simulated to calculate the loss.The surface plasmon resonance peak is obtained by the loss spectrum.The wavelength and the sensitivity of the sensor.Different wavelengths of the refractive index and transmission loss spectrum of the biological fluid sample are different.The invention has the advantages that the sensor combines the surface plasmon resonance technology with the photonic crystal fiber,and the average sensitivity is-1.13714um/RIU,respectively.The refractive index of the liquid sample is 1.38~1.43.The structure is simple and easy to operate.It has a great application prospect in the sensingfield.5.The full-vector finite element method was used to analyze the influence of the fiber structure parameters on the sensing characteristics.The effects of the fiber structure on the x-direction and the y-direction of the fiber-Mode field distribution and loss spectrum.The numerical simulation results show that:(1)the average sensitivity is-1.09143um/RIU;(2)the refractive index of the liquid sample to be measured The range of 1.38~1.43;(3)in practical applications,according to the actual demand to select the parameters set to meet the research needs performance indicators.