Research And Application On Optical Fiber Surface Plasmon Resonance Sensor

Surface Plasmon Resonance is an optical-electrical phenomenon involving the interaction of the light with the electrons of a metal. An optical-fiber sensor based on SPR effect is a novel bio-chemical sensor which ingeniously combines the optical fiber technology and SPR effect. This design possesses not only the characteristic of high sensitivity of SPR, but also many advantages of optical fiber, thus it has been provided with a significant future to be study and used in a wide range of application fields.Firstly, the principle of SPR and its exciting conditions are respectively discussed in the paper. At the same time, some factors which influence on SPR phenomenon are analyzed based on optics and electromagnetic.Secondly, the configuration design of optical fiber SPR sensor system and its work principle are discussed in detail. The paper studies the sensor character of optical fiber SPR sensor which is in the different type liquids or under different environment temperature. In particularly, in order to enlarge application field of this sort of sensor, the structure of SPR probe is redesigned by coating SiO films on the core of optical fiber. The experiment and theoretical analysis show that this improved probe has the ability to extend the detection upper limit of refractive index.Finally, epoxy resin cure and electrolysis process respectively will be detected by using this SPR probe in research. Curing and electrolysis monitor information can be obtained by observing the SPR resonance wavelength and the intensity of reflective lights which change in response to the change of environment refractive index .