Detection of SARS-CoV-2 with enhanced Cu-Ni-graphene plasmonic biosensor: a numerical analysis

SARS-CoV-2 causes COVID-19, a global health crisis with diverse symptoms, posing diagnostic challenges. The scarcity of testing equipment leads to long wait times for COVID-19 tests. To address this challenge, we propose a surface plasmon resonance biosensor configured as: Prism (BK7)/Copper (Cu)/Nickle (Ni)/graphene. This configuration proves advantageous for the detection of the SARS-CoV-2 virus. Addition of graphene as a 2D material enhances the sensitivity for detecting biomolecules. Graphene serves as a bio recognizing material, facilitating the binding of ample biomolecules on the sensing surface. Through optimization, we achieve a maximum sensitivity of 399.80°/RIU, coupled with remarkable detection accuracy and figure of merit. Hence, the proposed biosensor holds promise for biosensing applications, offering higher sensitivity and utilizing advanced fabrication techniques.