Sensitivity improvement of graphene based surface plasmon resonance biosensors with chaclogenide prism

Graphene and chalcogenide prism based surface plasmon resonance (SPR) biosensor used for the detection of Pseudomonas and Pseudomonas-like bacteria is presented in this paper. Angular responses, sensitivity, detection accuracy and quality parameter of SPR biosensor is investigated. This biosensor comprises of chalcogenide prism which is coated with gold layer and graphene layers. The proposed biosensor uses Kretschmann configuration to detect the change in refractive index near the sensor surface. By comparing these results with the conventional surface plasmon resonance biosensor coated with gold layer and chalcogenide prism, it is observed that the proposed SPR biosensor has sensitivity 6.47 times greater than that of chalcogenide prism based conventional SPR sensor. Also, the dependence of sensitivity, detection accuracy and quality parameter on the number of graphene layers for the proposed sensor is plotted and analyzed.