摘要
A multimode fiber-optic surface plasmon resonance （SPR） sensor with a MgF2 film as a modulated layer is studied. The fiber-optic SPR sensor is investigated theoretically, specifically the influence of the dielectric protecting layer, using a four-layer model. The sensor is then fabricated with the optimal parameters suggested by the theoretical simulation. The sensor has a high sensitivity in the analyte refractive index （RI） range of 1.33-1.40. The best sensitivity of 4 464 nm/RIU is achieved in the experiment. The use of dielectric film （MgF2） can not only modulate the resonance wavelength of the sensor, but also protect the silver film from oxidation.
A multimode fiber-optic surface plasmon resonance （SPR） sensor with a MgF2 film as a modulated layer is studied. The fiber-optic SPR sensor is investigated theoretically, specifically the influence of the dielectric protecting layer, using a four-layer model. The sensor is then fabricated with the optimal parameters suggested by the theoretical simulation. The sensor has a high sensitivity in the analyte refractive index （RI） range of 1.33-1.40. The best sensitivity of 4 464 nm/RIU is achieved in the experiment. The use of dielectric film （MgF2） can not only modulate the resonance wavelength of the sensor, but also protect the silver film from oxidation.
基金
supported by the National Basic Research Program of China(No.2011cb301802)
the National Natural Science Foundation of China(Nos. 60736037,61036005,and 10704070)
the Fundamental Research Funds for the Central Universities
