Polariton

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A polariton is a quasiparticle resulting from strong coupling of electromagnetic waves with an electric or magnetic dipole-carrying excitation.

For example, at optical frequencies, plasmons can couple with a photon to create another quasiparticle called a plasmon polariton.

Ukrainian physicist Kirill Tolpygo (1916 - 1994) is known for his theory of condensed matter.