Designing of Surface Plasmon Sensor in a Side Hole Fiber with Simultaneous Double Channel Detection

A surface plasmon resonance (SPR) sensor with high sensitivity and symmetrical double channel is proposed. A side hole fiber has been considered as a platform of the proposed sensor. Detailed numerical calculation is carried out with the full-vector finite-element method. A polarization-maintaining single mode fiber considered for the simulation purposes two symmetrical holes introduced in the boundary of the core-cladding interface for dual-channel detection purpose. Metal layers are introduced in the inner wall of the hole. Numerically computed results show that the sensor can work in the range of different refractive index (RI) from 1.30 to 1.43. Sensitivity can be reached as high as 8800nm/RIU around 1.43. The average sensitivity of the developed sensors is 5160nm/RIU is obtained.