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A novel dual-channel fiber-optic particle plasmon resonance sensor realized by CO2 laser engraving

We present a novel dual-channel fiber-optic particle plasmon resonance (FO-PPR) sensor for refractive index sensing. The sensor, fabricated by a CO2 laser system, was realized by modification of gold sphere nanoparticles and gold nano-rods simultaneously in two different fiber sensing zones with a length of 2cm. This type of sensor has shown the capacity of simultaneously sensing two different channels of PPR signals with a relatively high refractive index sensitivity (∼6.0/RIU).