Sensitivity enhancement of surface plasmon resonance biosensor based on graphene and barium titanate layers.

Graphical abstract Highlights • A surface plasmon resonance-based biosensor is proposed. • Graphene is utilized to increase the adsorbability in biosensors. • Barium titanate layer is used to improve the performance of SPR biosensor. • Our proposed SPR biosensor has better performance than those reported. Abstract A surface plasmon resonance-based biosensor, consisting prism, silver, barium titanate (BaTiO 3) and graphene layers, is presented by using angular interrogation. The structure is specially designed to further enhance the sensitivity and to decrease the full width at half maximum (FWHM) thereby improving the sensor performance. Theoretical analysis shows that the highest sensitivity can reach at 257°/RIU where the thickness of Ag layer is 45 nm with 10 nm BaTiO 3 and one graphene layer. Compared with existing biosensors, the proposed biosensor exhibits higher sensitivity, lower FWHM and two times better preformation in the quality factor of the sensor, which would make our design have more applications in the field of biosensors. [ABSTRACT FROM AUTHOR]