Research On The Refractive Index Sensing Characteristics Of Microstructure Fiber With SPR Enhancement Based On Computer Simulation

Computer simulation technology is to build a simulation model on computer software and conduct simulation experiments on the model.The whole process is controlled by computer instruction,which can be repeated for an infinite number of experiments,and the optimal research scheme can be found quickly.Compared with the actual experiment process,the procedure is greatly reduced.Sensing technology is closely related to people's life,among which optical fiber sensor shows great advantages in the field of sensing detection due to its small,light and high sensitivity.However,due to the complexity of the sensor detection program,the experiment cycle is longer,so it is particularly necessary to simplify the experiment process by using computer simulation technology.In this paper,computer simulation technology is used to simulate the influence factors of refractive index sensing characteristics of microstructure fiber.The main research contents include the following aspects:1.A local surface plasmon resonance sensor of a micro-structure fiber with a suspended core is designed by using computer simulation technology,and a surface throwing model of a microstructured fiber cladding is established on the comsol simulation software.The structure supports the resonance between the fundamental mode and the surface plasma wave.The resonance spectra of the structure at the wavelength of 550?1200 nm are theoretically simulated.By optimizing the size,number and material type of the nanometer metal rod,the refractive index sensing sensitivity reached the maximum value of 8600 nm/RIU when the refractive index of the external solution was 1.40.2.A model of surface plasmon resonance sensor of photonic crystal fiber with three air holes was established by using computer simulation technology.The three air holes of the model were arranged in arrays of 30°,45°and 60°respectively.The fiber structure supports the resonance between LP₀₁ mode and LP₁₁ mode and surface plasma wave.The resonance spectrum and refractive index sensing sensitivity of the structure at the wavelength of 550?1000nm are theoretically simulated.By optimizing the internal parameters such as the size of the air hole and the thickness of the metal film,the refractive index sensing sensitivity reached the maximum value of 9300nm/RIU when the refractive index of the external solution was 1.41.