For example , an exciton - polariton is a superposition of an exciton and a photon ; a phonon - polariton is a superposition of a phonon and a photon .
It may also be termed a polariton , especially near a resonance of the material .
An exciton - polariton is a superposition of an exciton and a photon ; a phonon - polariton is a superposition of a phonon and a photon .
It may also be termed a polariton , especially near a resonance of the material .