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I am trying to figure out what is the coupling of a surface plasmon with a photon for the generation of a surface plasmon polariton. In fact I don't understand what a coupling is in this context. Some texts say that for the coupling to happen is necessary that the dispersion curve for the photon touchs the dispersion curve of the surface plasmon and I don't know the reason. If anybody could enlight me what a coupling is and how is this connected with the dispersion curves encounters (momentum conservation) I would be very pleased. In the graph below is plotted the dispersion curves for the SP and a photon (Wikipedia), just for illustration.

Thanks for your attention an patience.

[PLAIN]http://upload.wikimedia.org/wikipedia/en/e/e8/Dispersion_Relationship.png [Broken]

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# Surface plasmon coupling

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