A comparative study among WS2, MoS2 and graphene based surface plasmon resonance (SPR) sensor

In the present paper, we propose a new design of surface plasmon resonance (SPR) sensor having better performance parameters by employing the well-known transfer matrix method. The proposed SPR sensor is comprised of BK-7 prism-ZnO-Ag-BaTiO3-Transition metal dichalcogenides (TMDCs, mainly WS2 and MoS2)/Graphene. A comparison is made among their performance parameters i.e. sensitivity, detection accuracy, quality parameter with other traditional reported SPR sensor. We have also analysed full width at half maxima (FWHM) and electric field intensity enhancement factor (EFIEF) for the proposed SPR sensor. On comparison, it is found that the proposed SPR sensor with monolayer WS2 configuration has better sensitivity of 180 degrees/RIU as compared to monolayer MoS2 and graphene which are 174 degrees/RIU and 157 degrees/RIU respectively. However, the proposed SPR sensor with graphene layer shows small FWHM, higher quality parameter and detection accuracy. We have found that maximum sensitivity of 235 degrees/RIU corresponds to the two-layer WS2 configuration. Our proposed SPR sensor shows better performance as compared to the other reported works.