Research On Sensing Properties Of Optical Fiber Surface Plasmon Resonance

Surface plasmon resonance technique is extremely sensitive to subtle changes in therefractive index of the external medium, this characteristic makes its applications of sensingincreasingly widespread, and has been rapid development in recent years. Optical fibersurface plasmon resonance sensing system combines high sensitivity of surface plasmonresonance and low energy loss of optical fiber technology. It has high sensitivity, highresolution, small sensor size, suitable for a variety of measurement environments, enablesreal-time online measurement and many other advantages that traditional sensors can notmatch it. Now optical fiber surface plasmon resonance has important applications inbiochemistry, engineering, petroleum and petrochemical, food and medicine, environmentalmonitoring, etc.This paper describes the surface plasmon resonance sensor technology and physicalprinciples of optical fiber. It also introduces the sensing principle, structure model, researchstatus and prospects of optical fiber surface plasmon resonance sensor technology. Based onoptical fiber surface plasmon resonance sensor model, this paper uses the methods oftheoretical analysis and simulation software, by analyzing the reflection spectrum to identifythe main factors of affecting the spectral characteristics, such as the materials of metal film,metal film thickness, incident angle, core refractive index, then summarizes the response law.Learned through a lot of simulation studies known that the metal film material has a greatimpact on optical fiber surface plasmon resonance reflectance spectra. Comprehensiveanalysis showed that the gold film and the silver film can get better sensor sensitivity,resolution and SNR. In addition, both the thickness of metal film and the optimal angle existcertain optimum value can make the sensor to achieve the best performance. As the substrateof optical fiber surface plasmon resonance sensor, core refractive index has a great influenceon resonant wavelength and peak width. Finally, the simulation results indicate that lowsurrounding refractive index has a good linear relation to resonant angle. This featureprovides a strong theoretical support to the practical application of optical fiber surfaceplasmon resonance sensor. This paper is a fiber optic surface plasmon resonance sensordesign and optimization of the structure provides theoretical support, with higher referenceguide.