Numerical Modeling of a Nanostructure Gas Sensor Based on Plasmonic Effect

In the present paper, a nanostructure plasmonic gas sensor based on ringresonator structure at the wavelength range of 0.6-0.9 μm is presented. The plasmonicmaterials/SiO2 with the advantage of high mobility and low loss is utilized as a substratefor structure to obtain some appropriate characteristics for the sensing Performanceparameters. To evaluate the proposed sensor and calculation of performance parametersincluding figure of merit and sensitivity, the effect of the different gas including CarbonDioxide (CO2), Acetonitrile (C2H3N), Carbon disulfide, and Sarin are considered. Forthis purpose 3D-FDTD method is considered. Our calculations show that by couplingbetween the incident waves and the surface plasmons of the structure, a hightransmission ratio of 0.8 and relatively low insertion loss of 6 dB around the wavelengthinterval of 0.6-0.9 μm are achievable. Furthermore, the calculated sensitivity and figureof merit are 28 and 8.75, respectively. This provides a path for development of nanoscalepractical on-chip applications such as plasmonic memory devices.