Encrypted and tunable graphene-based metasurface refractive index sensor

Encryption is a very essential part to secure data communication in today's world where there is a threat of stealing data. We have proposed a graphene-based metasurface biosensor for sensing and encryption applications. The biosensor is designed to sense the hemoglobin (HT) biomolecules with high sensitivity. The results are analyzed in the form of transmittance and electric field of the proposed graphene-based metasurface biosensor. The graphene layer's chemical potential is varied to achieve the coding of '0' and '1'. This creates one-digit coding. The array of this proposed structure with this coding can be used for encryption applications. The biosensor design is analyzed for four HT concentrations and their sensitivity is compared. Different geometrical parameters are analyzed and their effect is observed for tunability. The response from the design can be useful in future biomedical and data encryption applications.