Numerical Modeling of a Nanostructure Gas Sensor Based on Plasmonic Effect

Document Type : Articles


Faculty of Engineering, Lorestan University, Khoram abad, Iran


In the present paper, a nanostructure plasmonic gas sensor based on ring
resonator structure at the wavelength range of 0.6-0.9 μm is presented. The plasmonic
materials/SiO2 with the advantage of high mobility and low loss is utilized as a substrate
for structure to obtain some appropriate characteristics for the sensing Performance
parameters. To evaluate the proposed sensor and calculation of performance parameters
including figure of merit and sensitivity, the effect of the different gas including Carbon
Dioxide (CO2), Acetonitrile (C2H3N), Carbon disulfide, and Sarin are considered. For
this purpose 3D-FDTD method is considered. Our calculations show that by coupling
between the incident waves and the surface plasmons of the structure, a high
transmission ratio of 0.8 and relatively low insertion loss of 6 dB around the wavelength
interval of 0.6-0.9 μm are achievable. Furthermore, the calculated sensitivity and figure
of merit are 28 and 8.75, respectively. This provides a path for development of nanoscale
practical on-chip applications such as plasmonic memory devices.


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