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Fully distributed fiber-optic biological sensing is demonstrated based on a traveling long-period grating (LPG) in a single-mode fiber coated with a functional film. The temporal LPG is generated by an acoustic pulse propagating along the fiber. Immunoglobulin G (IgG) is immobilized onto the surface of the fiber via ionic self-assembly. We show that specific antigen-antibody binding can introduce...
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