Research On New Phenomenon, New Method And Temperature Characteristic Of Surface Plasmon Resonance Sensing

The research work within this dissertation is supported by the National Key Basic Research Program of China(No.2006CB302905),the Key Program of National Natural Science Foundation of China(No.60736037),the National Natural Science Foundation of China(No.10704070) and so on.The effects of temperature on a surface plasmon resonance(SPR) sensor are studied experimentally and theoretically.By using the rigorous coupled wave analysis(RCWA),the physical mechanisms and technological applications of SPR sensor based on metallic gating are numerically analyzed.The main research works and conclusions are as following:1.A complete theoretical model is established to analyze the variation of performance with varying temperature of the sensing environment.The model consists of the temperature dependence of the thickness and dielectric function of metal film,the refractive index of dielectric layer and analyte.The magnitude of temperature effects on the every part of SPR sensor is analyzed.The temperature stability of sensitivity of SPR sensors which work under different interrogation mode are compared,the performance of angular interrogation mode has a distinct advantage over that of wavelength interrogation mode.A fiber-optic SPR temperature sensor is designed,and the structural parameters,such as numerical aperture and length of sensing area,are optimized by numerical simulation,the optimized sensitivity can reach 201.9pm/K,it is much better than common used fiber temperature sensor which is based on fiber grating.2.The effects of temperature on a conventional prism-based SPR sensor are studied experimentally using pure water as analyte,the resonance angle shifts to smaller values and the SPR curve broadens with the increase of temperature.By use of Spreeta ^TMSPR sensing module,a portable SPR sensing system is established to detect the concentration of dextrose solution,and the temperature characteristic of portable SPR sensors is experimentally studied.The temperature characteristic of fiber-optic SPR sensor is experimentally investigated.By the experimental research on the temperature characteristic of these three kinds of SPR sensors,our theoretical model is well validated,it may lead to better fabrication of high sensitivity SPR temperature sensor and the SPR sensor against the temperature variation.3.The sensing characteristic of SPR sensor with reflection type metallic grating is investigated with RCWA method,and the mechanism is analyzed by the field distribution.It is found that the sensitivity of negative diffraction order,which goes higher quickly as the resonant angle increases,is much greater than that of positive diffraction order.A SPR hydrogen sensor using a Palladium-coated gold sub-wavelength grating is proposed,the influence of grating parameters and the thickness of Palladium on the performance of grating-based SPR hydrogen sensor are analyzed by numerical simulation.A theoretical resolution of hydrogen concentration on the order of 0.001%is finally obtained in our design.The double-dips method using the separation of two dips of different orders to improve the sensitivity of SPR sensors based on metallic grating is demonstrated.4.Based on RCWA method,the sensing characteristic of SPR sensor with a grating-prism composite structure is investigated.The sensing enhancement of sub-wavelength metallic grating for the angular and wavelength interrogation SPR sensor is studied respectively.The mechanism of multiple SPR dips are analyzed,a double-dips method using the separation of common SPR dip and negative diffraction grating SPR dip at the analyte-metal interface to improve the sensitivity of SPR sensors with composite structure is proposed.A grating-based long-range SPR sensor is designed,its figure of merit(FOM) is 2.4 times of that of conventional long-range SPR sensor.Highlights of the dissertation are as following:1.The temperature effects on the thickness and dielectric function of metal film,the refractive index of dielectric layer and analyte are roundly analyzed,a complete theoretical model is established to analyze the temperature characteristic of the SPR sensors for the first time,and the model is well validated by the experimental research on the prism-based,portable and fiber-based SPR sensors,the magnitude of temperature effects on the every part of SPR sensor also are analyzed using our model.2.It is the first time to discover that the sensitivity of SPR sensor with reflection type metallic grating using negative diffraction order goes higher quickly as the resonant angle increases,and is much greater than that using positive diffraction order.The mechanism is analyzed by the field distribution.A SPR hydrogen sensor using a Palladium-coated gold sub-wavelength grating is proposed,a theoretical resolution of hydrogen concentration on the order of 0.001%,which is much better than that of common used hydrogen sensor(0.1%),is finally obtained in our design.3.The double-dips method using the separation of different dips to improve the sensitivity of SPR sensors based on metallic grating is proposed.A grating-based long-range SPR sensor is designed for the first time,and its figure of merit(FOM) is 2.4 times of that of conventional long-range SPR sensor...