Polaritointi
Polaritointi is a phenomenon in condensed matter physics where photons, the quantum particles of light, couple strongly with collective electronic excitations in a material. This coupling creates new quasiparticles called polaritons, which are neither purely photons nor purely electronic excitations but a hybrid mixture of both. The strength of this interaction is typically observed in systems where the energy of the photons is close to the energy of the electronic excitation, a condition known as resonance.
When light interacts with a material, it can excite electrons. If this excitation is collective, meaning many
Polaritons exhibit properties that are distinct from both their constituent photon and electronic excitation. For example,