Surface Plasmon Resonance
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Surface plasmon resonance (SPR) is one of several optical phenomena known to occur on two-dimensional metal surfaces (typically gold or silver films) when a total internal reflection of incident light occurs at the interface of two different substances, one with a high refraction index and the other with a low refraction index. The SPR biosensor, which exploits the SPR phenomenon, is a label-free and surface-sensitive spectroscopic system, which utilizes measured changes in the local refraction index upon adsorption. This sensor may be applicable to disease diagnostics and high-throughput screening (HTS) in drug discovery, as well as to studies of biomolecular interaction.
Detection Principle of SPR Biosensor