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Plasmonic biosensor [130].
(A) Schematic of the plasmonic interferometer based on nanoscale slits and grooves in silver film. (B) Side view of the interferometer structure showing interference between directly transmitted light and surface plasmons reflected at grooves to create index-dependent transmission signal. (C) Time-dependent sensor response upon BSA adsorption to the sensor surface and subsequent specific protein binding between BSA and anti-BSA.
