FEM Study of Graphene Based Tunable Terahertz Plasmonics Gaseous Sensor

A suspended doped graphene monolayer based terahertz (THz) plasmonics gaseous sensor using Otto prism-coupling attenuated total reflection configuration was presented. The finite element method (FEM) software COMSOL MULTIPHYSICS is used to combine Maxwell’s equation and Druse-Lorentz’s dispersion model into a 2D simulations to investigate the performance of the sensor in terms of detection accuracy with different refractive index gaseous sample. The sensitivity was also acquired by using the dispersion relation analysis. Preliminary results showed good agreement between simulation and theoretical analysis, as well as supporting previously literature reported calculation result. This method also can be used to computationally explore and design graphene based plasmonics sensor with more complex geometries compared with current sensor.