GMIABSA: High Sensitivity Metamaterial Inspired Absorber for Biomedical Sensing

This paper presents and assesses the performance of novel metamaterial absorber design operating in the terahertz frequency range. The design presented in this study comprises a metallic patch constructed using a modified split ring resonator (MSRR). The absorber's resonance frequency responds quickly to changes in the medium's refractive index while maintaining a constant analyte thickness. As a result, absorber design can work well as a refractive index sensor, exhibiting a remarkable sensitivity of 750GHz/RIU and a figure of merit (FoM) of 3.575 with refractive index ranging from 1.0-1.4, at the analyte thickness of 1μm. Additionally, the proposed sensor can detect changes in the thickness of the sensing layer with a sensitivity of 30GHz/μm while keeping the analytes refractive index constant at 1.4. The calculated amplitude sensitivity of 37.5/RIU has significant implications for biomedical applications. It enables the detection of refractive index variations in biological samples like blood or tissue. By analyzing the absorption of the sensor, it becomes possible to identify alterations in the sample's refractive index. These changes can serve as indicators for various biological processes, including disease presence or cell growth. Consequently, this technology holds immense potential in revolutionizing medical diagnostics by facilitating the early detection of diseases.