Sensitivity enhancement of a surface plasmon resonance sensor using Blue Phosphorene/MoS2 hetero-structure and barium titanate

In this paper, the characteristics of an Ag-based surface plasmon resonance (SPR) sensor is theoretically investigated. Our simulations are based on finite difference time domain (FDTD) method and light with wavelength of 633 nm has been applied. The proposed sensor consists of an FK51A prism with a relatively low refractive index, thin metal film, 8 nm BaTiO3, 3 layers of BlueP/MoS2 hetero-structure, and a sensing medium. Sensor performance parameters for the proposed sensor have been reported. Sensitivity as high as 347.82 deg/RIU for this device is obtained when the refractive index of sensing medium is 1.33. This means more than 2.6 times improvement in sensitivity compared with conventional biosensor with a sensitivity of 131.68 deg/RIU is achieved. Although the main aim of this paper is improving sensitivity by proposing a new structure, quality factor (Q) is almost high and acceptable.

Automated summary

This paper theoretically investigates the characteristics of an Ag-based SPR sensor and proposes a new sensor structure with improved sensitivity. By utilizing materials like thin metal film and BaTiO3 on an FK51A prism, sensitivity as high as 347.82 deg/RIU was achieved compared to traditional biosensors.