In physics, a plasmon is a quantum of plasma oscillation. Just as light (an optical oscillation) consists of photons, the plasma oscillation consists of plasmons. The plasmon can be considered as a quasiparticle since it arises from the quantization of plasma oscillations, just like phonons are quantizations of mechanical vibrations. Thus, plasmons are collective (a discrete number) oscillations of the free electron gasdensity. For example, at optical frequencies, plasmons can couple with a photon to create another quasiparticle called a plasmon polariton.
https://en.wikipedia.org/wiki/Plasmon
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