4-LAYER CHEMICAL FIBER OPTIC PLASMON-BASED SENSOR

A fibre optic surface plasmon resonance (SPR) sensor with a four-layer configuration is presented. Three-layer SPR sensors have been proposed before, but in many applications their dynamic range is not enough. Theoretical studies are carried out to achieve different dynamic ranges using the fourth layer which also gives toughness to the sensor configuration. Concentration data in different sensitivity and dynamic range situations are measured with four sensors in a fully automatized process where their operation is tested.