Designing and Analysis of Ultrathin Metamaterial Absorber for W Band Biomedical Sensing Application

The research investigates the sensing characteristics of the ultrathin metamaterial absorber for refractive index detection of biomedical samples. The absorber is made up of a novel spanner resonator and has an abortion peak of 99.7% at 105.7 GHz with FWHM (Full Width Half Maxima) and Q factor of 5.4 GHz and 19.57 respectively. The designed absorber is evaluated for biomedical sensing applications to enhance the output variation, linearity and sensitivity. The majority of the biological samples had refractive indices in the extremely close range and detecting such samples with close refractive indices is a substantial challenge. The proposed resonator is capable of sensing such kind of near refractive index samples with an average sensitivity and FoM (Figure of Merit) of 14.81 GHz/RIU (Refractive Index Unit) and 3.48 respectively. Moreover, the absorber sensor is capable of handling thick and thin biological materials. The suggested design paves the path for the development of a millimeter-wave metamaterial absorber to be used in biosensor applications. The results findings are validated using full-wave electromagnetic simulations, curve fitting and measurements. Furthermore, the design is constructed in a flat and ultrathin manner and because of its compact size, has a high potential for integration with any sensor equipment.