Detection of SARS-CoV-2 Nucleocapsid Protein Using Si Microring Resonator Biosensor

In this study, a fabricated silicon (Si) microring resonator biosensor was able to detect 500 fg/mL of the SARS-CoV-2 nucleocapsid protein in phosphate-buffered saline. The relationship between the amount of wavelength shift and refractive index change is investigated in this work.