Spectral Analysis of a SPR Sensor based on Multilayer Graphene in the Far Infrared Range

In this paper, we present a spectral analysis of Surface Plasmon Resonance (SPR) sensor based on multilayer graphene (MLG) operating as terahertz refractometer. This device's structure is Kretschmann configuration, and the layers are modeled surface impedances with conductivity described by Kubo model. The structure's electromagnetic response obtained from Generalized Coefficients Model, considering TM excitation performed in frequency range 1 to 4Thz. approach, evaluate for two, three, four five graphene, equally doped. To verify effects MLG doping, varied chemical potential 0.35eV 0.70eV. As result, plasmonic device, verifying each case graphene. addition, sensitivity, FWHM Figure Merit (FOM) calculated describe performance demonstrated case. From results presented, verified that increase doping reduces sensitivity sensor, however, it improves its FOM. validation proposed model was carried out simulations software Finite Element Method.