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Open Access Publications from the University of California

High-contrast grating resonators for label-free detection of disease biomarkers.

  • Author(s): Sun, Tianbo
  • Kan, Shu
  • Marriott, Gerard
  • Chang-Hasnain, Connie
  • et al.

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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.

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