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Surface plasmon resonance is the resonant oscillation of conduction electrons at the interface between negative and positive permittivity material in a particle stimulated by incident light. SPR is the basis of many standard tools for measuring adsorption of material onto planar metal surfaces or onto the surface of metal nanoparticles. It is the fundamental principle behind many color-based biosensor applications and lab-on-a-chip sensors. It should be stressed that SPP is not a resonance on the planar surface and it is a polariton or surface-wave like phenomenon.
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