High sensitivity SPR sensor based on microfiber coated with gold nanowires

Abstract

In this paper, we proposed surface plasmonic resonance (SPR) sensor based on microfiber coated with gold nanowires. Using finite element method, this SPR-based fiberoptic sensor is investigated. Dependence of sensitivity of the sensor on the microfiber radius is simulated for analyte refractive index of 1.33-1.34. The simulation shows that there is an optimized microfiber radius of 8.5μm, yielding to the highest sensitivity of 4400nm/RIU among the radius of 7.5μm-10μm.