Design of Ultra-Sensitive Metamaterial Sensor Device for Environmental Sensing

The fastest growing population, continuous discharge of various chemical pollutants from industrial sector, automobile exhaust, wasted garbage burning are leading factors of toxic gases in air environment. Therefore, it is necessary to develop highly sensitive gas sensors for monitoring and detection of these hazard gases. This work demonstrated a metamaterial sensor device in the terahertz region for sensing and detection of toxic gases in pollution air environment. The potential design composed of two asymmetrical gold resonators cover on insulated part and gold section at the bottom. The simulation results illustrate triple peaks located at 2.04 THz, 2.56 THz and 3.95 THz with absorption strength approximated to 98%. The absorption profile of triple-band was investigated by near field distribution. Furthermore, the influence of the geometric parameters on the performance of triple-band light absorption was also analyzed to further verify the underlying mechanism of these tri-band. Moreover, the sensor device has been successfully employed for the detection of several harmful gases with extremely high sensitivity of 7.2 THz/RIU was observed for Sulphur dioxide gas, that was not previously reported in the literature. The proposed work can be potentially significant for designing highly sensitive gas sensors. The demonstrated research can also be vital in other sensing fields such as chemical and bio sensing industry applications.