Refractive index sensor based on high-order surface plasmon resonance in gold nanofilm coated photonic crystal fiber
Fan Zhen-Kai1, Fang Shao-Bo2, 3, ‡, Li Shu-Guang4, Wei Zhi-Yi2, 3
       

The cross-sections of the proposed SPR-PCF refractive index sensors of (a) type-1 and (b) type-2. The loss and refractive index of the PCF dependance on the operation wavelength when the analyte refractive index na is 1.33 for (c) type-1 and (d) type-2. The outermost layer of the air hole is filled with refractive index analyte.