A chip-scale glucose sensor was developed using nitride optical waveguides. The label free detection was conducted at λ = 2.70 - 2.81 μm and 3.50 - 3.70 μm because these spectral regions overlap with the characteristic O-H and C-H stretch absorptions while being transparent to nitride. For a glucose covered mid-IR waveguide strong intensity attenuation was found at λ > 2.73 μm and a detection limit better than 0.5 ng is experimentally demonstrated.

© 2018 The Author(s)

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