Abstract
A nearly perfect metamaterial absorber is proposed that can find utility in terahertz sensing applications. The design consists of two concentric elliptical ring resonators (ERRs) whose parameters are appropriately set to achieve dual band absorption with near perfect absorption. The first absorption band at 3.62 THz having a Q-factor of 51.7 was caused due to the currents in the outer and inner ERR. The second absorption peak at 3.814 THz having a Q factor of 1411.11 was a consequence of currents flowing across the gap between the two concentric resonators. Furthermore, it is observed that the absorption bands are sensitive to the variation in refractive index of the surrounding medium. The sensitivity’s in the absorption bands are 3 THz/RIU and 3.59 THz/RIU respectively. A sensor is proposed based on this design to detect harmful gases, which is demonstrated for detection of Methane and Chloroform. High Q-factor and high sensitivity of the narrow band makes the design an excellent sensor for detecting variations in the refractive index.
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