Design and Simulation of SRR-Based Tungsten Metamaterial Absorber for Biomedical Sensing Applications

The unique ability to absorb electromagnetic radiation by metamaterial absorbers has garnered significant attention in recent periods. The proposed simulation study shows a new SRR-based metamaterial absorber design which has potential applications in biological sensing operating in the terahertz range. The proposed design incorporates four identical square ring resonators (SRR) made from Tungsten placed on top of a dielectric layer that was made by Gallium Arsenide (GaAs) semiconductor. Both the layers are formed on a Silicon substrate. The sensing regime's high field confinement results in a unity perfect absorption (i.e.,100%) at 2.75 THz, with a large quality factor of 39. According to the findings, the proposed design exhibits exceptional sensitivity while modifying the refractive index (n) of the medium. As a result, the proposed device can serve as a biomedical sensor (refractive index (n) sensor) with a sensitivity of 60 THz/RIU and a figure of merit (FoM) of 20. The researchers verified the device with refractive index (n) values ranging from 1.34 to 1.39, which covers a broad range of biomedical blood samples, including cancerous cells. As a result, this sensor design can be employed for a variety of biomedical sensing applications.