Abstract
Sensitivity is very important while designing any biosensor. We present a tunable and highly sensitive absorbing metasurface for sensing hemoglobin biomolecules. The metasurface is based on phase change material made using different alloy combinations of Ge2Sb2Te5 (GST). Hemoglobin biomolecules are sensed using the perfect absorbing metasurfaces. Three metasurfaces made up of C-shape split-ring resonator and thin wire are investigated. The biosensor is investigated for different phases of GST material and tuning is observed for amorphous GST (aGST) and crystalline GST (cGST). The results are presented in the form of absorption, electric field, and magnetic field. The absorption results for different angles show that the metasurface is angle sensitive. The results are also observed for different geometrical parameters like GST material thickness and gold metasurface thickness. The proposed perfect absorbing sensitive metasurface based on phase-changing material can be used for sensing hemoglobin in biomedical applications.
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