An interferometric method was used for the first time to detect, under surface-plasmon resonance conditions, phase changes in a reflected beam caused by changes in the refractive index of the medium being diagnosed. The threshold of the sensitivity to changes in the refractive index was estimated to be 4 × 10 -8 . The proposed interferometer can be used successfully in bio and chemical-sensor systems.
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Kabashin et al. (1997) studied this question.
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