Aiming at the problem of easy oxidation of metal film on the outer surface of Photonic Crystal Fiber(PCF) refractive index sensor
a new structure of PCF refractive index sensor is proposed. The air holes of the PCF are arranged in a spiral track. Double coating is on the outer surface of the PCF. The silver is coated on the outer surface of the PCF as a Surface Plasmon Resonance(SPR) material
and a 15 nm thin ZnO film is coated on the silver film to prevent the metal from being oxidized. The properties of this sensor is analyzed by the full vector finite element method with the boundary condition of anisotropic perfectly matched layer. Results show that the maximal sensitivities of the sensor reach 5 200 nm/RIU and the resolution reach 1.92×10
-5
RIU when refractive index is in the range of 1.30 to 1.36.
关键词
全矢量有限元法光子晶体光纤表面等离子体共振双层膜涂覆折射率
Keywords
full-vector finite element methodPCFsurface plasmon resonancedouble layer coatingrefractive index