Lawrence Berkeley National Laboratory
High-contrast grating resonators for label-free detection of disease biomarkers.
- Author(s): Sun, Tianbo
- Kan, Shu
- Marriott, Gerard
- Chang-Hasnain, Connie
- et al.
Published Web Locationhttps://doi.org/10.1038/srep27482
A label-free optical biosensor is described that employs a silicon-based high-contrast grating (HCG) resonator with a spectral linewidth of ~500 pm that is sensitive to ligand-induced changes in surface properties. The device is used to generate thermodynamic and kinetic data on surface-attached antibodies with their respective antigens. The device can detect serum cardiac troponin I, a biomarker of cardiac disease to 100 pg/ml within 4 mins, which is faster, and as sensitive as current enzyme-linked immuno-assays for cTnI.