An SPR-based optical biosensor with shared plasmonic materials and optimized graphene layer: An angular interrogation approach

In this paper, Kretschmann configuration based SPR biosensor with a simple architecture is proposed where a shared plasmonic materials (Ag-Au) is employed. In order to enhance the sensing performance, an optimized graphene layer is used. To evaluate the sensing performance of the proposed sensor, an angular interrogation method is utilized where the performance measuring parameters i.e. sensitivity and detection accuracy (DA) are considered. From the analysis, it can be shown that the sensor exhibits maximum possible sensitivity of 180 °/RIU with lower DA which are highest than that of the conventional prism based sensors. In application to detect myriad of biological and biochemical analytes, the proposed biosensor can be an alternative considering its sensitivity level and DA.