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. 2021 Jan 6;177:112971. doi: 10.1016/j.bios.2021.112971

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Fig. 5 — Evaluation of the THz metasensor in diluted solution. a, b, Measured transmission spectra of the THz metasensor device for different concentrations (from 4 to 30 fM) of BSA and SARS-CoV-2 spike protein + BSA, respectively. For 0 fM of spike protein, the spectral response was defined merely for antibody conjugated AuNPs plus PBS. c, Variations of the toroidal dipole mode for different concentrations of BSA, SARS-CoV-2 spike protein, and BSA + SARS-CoV-2 spike protein. The spike proteins in all experiments were captured by functionalized AuNPs conjugated with the respective antibody.