A graphene-based triple-band THz metamaterial absorber for cancer early detection.

In this article, a silicon-graphene-based absorber in the terahertz (THz) spectrum is provided for the synchronic surveilling of blood components such as water, glucose, cells, and so on. Our presented absorber has three resonant absorption frequencies at 0.865, 1.43, and 2 THz with a max Q-factor of 15.82. Although it has the advantages of miniaturized, low sample consumption, and cost-effectiveness it is simpler and faster than other conventional methods. Triple resonant absorption peak provides a highly sensitive sensor, reduces the quantification errors, and achieves higher precision to the change of samples dielectric constant in comparison with single or double band biosensors. So by attaching a test medium (analyte) and applying the various refractive index, it has been shown that the suggested biosensor sensitivity is approximated by the absorbency properties with average absorbance of 99.58% for the suggested biomedical sensor that is distinguished among the reported biomedical sensors structures. The impact of dielectric properties, operating frequency, and sample thickness on the operation of the graphene-based absorber is analyzed by the full wave FEM method. The proposed absorber with a narrow absorption spectrum and good sensitivity potentially can be used for biochemical sensing applications. [ABSTRACT FROM AUTHOR]