Proposal of compact LSPR sensor system by filter-free wavelength sensor

Abstract

A compact localized surface plasmon resonance (LSPR) sensor system integrated with a filter-free wavelength sensor (FFS) for quantitative virus detection methods was demonstrated. The changed transmission spectrum of the LSPR sensor by molecule was measured using an FFS as a transducer without a conventional spectrometer. We designed and fabricated gold nanostructures optimized for virus detection. As the concentration of S-protein RBD changed from 0.1 to 10 ng ml−1, the change in the current ratio from 0.012 to 0.094 was obtained by the FFS. We expect a compact and rapid virus detection system with qualitatively diagnose to be realized using the proposed method.